Question # 1

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

A wave which consists of a single, non-repetitive disturbance is called a

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Continuous wave

Longitudinal wave

Pulse

Transverse wave

In a closed organ pipe, the fundamental frequency is f. What will be the ratio of thefrequencies of the next three overtones?

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2 : 3 : 4

3 : 7 : 11

3 : 4 : 5

3 : 5 : 7

Gain of operational amplifier is independent of;

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Internal structure

External Structure

Batteries

Potential changes

Maximum number of orders available with a grating is ______ grating element

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Independent of

Directly proportional to

Inversely proportional to

Equal to

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

If N is the number of rulings on the grating, then the resolving power in the mth order diffraction equals to

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R = N × m

R = N/m

R = m/N

R = N × m²

Two resistances 4Ω and 6Ω are in series they are in parallel with a 10Ω resistance.The equivalent resistance is

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5Ω

8Ω

12Ω

20Ω

Fire fighters have a jet attached to the head of their water pipes in order to

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Increase the mass flow per sec

Increase the volume flow per sec

Increase the velocity of water flowing out

Avoid wastage of water

If the body undergoes unequal displacements in equal intervals of time, the body moves with

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variable velocity

constant velocity

uniform velocity

zero velocity

The time taken by the light to travel from Pluto to Earth is

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4 hrs 20 sec

5 hrs 20 sec

6 hrs 20 sec

76 hrs 20 sec

Electromagnetic waves emitted by hot bodies are called:

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Photoelectrons

Alpha rats

Thermal radiation

None of these

Einstein inferred that is gravitational acceleration and inertial acceleration are equivalent, gravity must

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Reflect light

Bend light

Turn light

None of these

The moment of inertia plays the same role in angular motion as in linear motion as

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Density

Weight

Mass

None of these

The low blood pressure is known as

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Diastolic

Systolic

Low blood pressure

None of these

Amorphous solids are more like

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crystalline solids

polymeric solids

glassy solids

any one of them

A wire is stretched to double of its length.The strain is

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2

1

Zero

0.5

The drag force increase if the speed of the object moving through a fluid

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Increases

Decreases

remains constant

None of these

The first superconductor was discovered by

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Fermi

Kmaerlinghormes

Weinberg

None of these

The phenomenon of diffraction can be exhibited by

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Polarized waves only

Un polarized waves only

Longitudinal waves only

All polarized or un polarized waves and longitudinal or transverse waves

The force between two charges in 8 N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

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2 N

4 N

6 N

8 N

What is the magnitude of a point charge which produces an electric field of 2 N/C at a distance of 60 cm)?

(1/4πε_∘ = 9 x 10⁹ Nm²/C²)

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8 x 10^-11 coulomb

2 x 10^-12 coulomb

3 x 10^-11 coulomb

6 x 10^-10 coulomb

Only those processes are probable to take place for which entropy os the system:

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Increases

Remains constant

Both A and B are correct

None of above

Range of a projectile is R.when the angle of projection is 30°.Then the value of the other angle of projection for the same range is:

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45°

60°

50°

40°

A bomb of mass 12 kg initially at rest explodes into two pieces of masses 4 kg and 8 kg.The speed of the 8 kg mass is 6 ms^-1,The K.E of the 4 kg mass is

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32 j

48 j

114 j

288 j

In Michelsion's interferometer the path difference is varied by moving

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compensatory plate

moveable mirror

fixed mirror

telescope

Polymers are the physical combinations of carbon with:

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Oxygen only

Hydrogen

Nitrogen

All of these

None of these

The light source used in multimode step index fibre is

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A monochromatic source

Red light

White light

None of these

If the resultant of n forces of different magnitudes acting at a point is zero, then the minimum value of n is

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1

2

3

4

When a droplet falls through a medium with terminal velocity the acceleration is

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Maximum

Minimum

Constant

Zero

The young modulus of steel is greater than that of aluminium.

Keeping the statement above in mind state which of the following is true

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Steel requires a larger stress on it for a given strain than does aluminium

Aluminium requires more force than steel does to get a similar extension as steel

Steel requires less force than aluminium does to get a similar extension as aluminium

Steel requires a larger strain on it for a given stress than does aluminium

Kinetic energy of rotation of the whole body is

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K.E._rot = lω

K.E._rot = lω²

K.E._rot = l²ω²

None of these

Light signals in an optical fibre eventually become dim and must be regenerated by devices called

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transmitters

receivers

photodiodes

none of them

Those solid which breaks soon after crossing the elastic limit are called

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Amorphous

Glassy solid

Crystalline solid

Brittle

To get p-type semiconductor we add impurity from

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3^rd group

4^th group

5^th group

6^th group

Any superconductor with critical temperature above 77 K, is referred as

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low temperature superconductor

high temperature superconductor

very low temperature superconductor

none of them

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

The number of different crystals systems based on the geometrical arrangement of their atoms and the resultant geometrical structures are

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5

7

9

14

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a balloon

A pulse of light in the optical fibres represents the number

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0

1

2

3

The equations for uniformly accelerated motion can also be applied to free fall motion of the objects by

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V_f = 0

Simple 'a'

a by g

None of these

The dimensions of power are

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[ML²T²]

[ML²T^-2]

[ML²T^-3]

[M²LT^-3]

A wire length L and radius r is fixed at one end and force F applied another end produces an extension x The extension produced in another wire of the same material of length 2L and radius 2r by force 2F is

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1

I

21

41

Where in standing wave, do the vibrations of the medium occur?

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Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

A pure semiconductor has:

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An infinite resistance at 0^oC)

A finite resistance which does not depend upon temperature

A finite resistance which decreases with temperature

A finite resistance which increase with temperature

Which of the following are the units of intensity of light

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Pois

Lux

Siemen

candela

Bernoulli s equation is applicable on

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Non viscous fluid only

Incompressible fluid only

Stream line flow

Ideal fluid

With a step-index fibre, the overall time difference between all the wavelengths arrived at the other end may be about

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43 s per km

33 s per km

1 ns per km

33 ns per km

Which row is correct for fission and for fusion?

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Produces larger nuclei

Produces smaller nuclei

The linear acceleration of the particle of mass m describing a horizontal circle of radius r with angular speed ω is

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rω

ω/r

rω²

r²ω

The waste material of the process in a digester is a good

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Inorganic fertilizer

Organic fertilizer

Waste disposal

b and c

Physics deals with the study of

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Matter and Energy

Outer atmosphere

Matter and Energy and their relationship

None of these

When the lift is moving downward with an acceleration 'a' then

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T - W = ma

T = W - ma

T - ma = W

None of these

One year is equal to

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4.3 × 10¹⁰ sec

4.4 × 10⁸ sec

3.12 × 10⁷ sec

3.2 × 10⁶ sec

The resolving power of telescope depends on

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Focal length of eye lens

Focal length of objective lens

Length of the telescope

Diameter of he objective lens

The Earth rocks are in molten and partly molten state, usually within the Earth surface of

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5 km

10 km

15 km

18 km

The average normal temperature of human body is

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98.4°C

18.4°C

37°C

20°C

The resolving power of human eye is

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1°

2°

3°

6°

The ratio of linear stress/linear strain is called

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Yong's modulus

Bulk modulus

shear modulus

modulus

The total internal reflection takes place for glass-air boundary is then the angle is

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Equal to 41.8^o

Greater than 41.8^o

Less than 41.8^o

None of these

In the stress-strain graph, stress is increased linearly with strain until a point is reached, this point is known as

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plastic limit

plastic deformation

proportional limit

elastic behaviour

The transmitter in optical fiber system contains a device called

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LED

Diode

Transistor

None of these

Acceleration of a body at any particular instant during its motion is known as

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

The capacity of a condenser when a dielectric is placed in between its plates

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Increases

Decreases

Doest not change

The effect is to increase the inflation the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

zero

Choose the correct statement

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Rays are normal to wave front

Rays may be normal to wave front

Rays are not normal to wave front

There is no relationship between rays and wave fronts

Pick out the wrong pair:

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Charge-coulomb

Temperature-thermometer

Pressure-barometer

sp.gravity-hygrometer

Approximate power of flash light in watts: (2 cells)

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1.2

1.5

1.55

1.56

The average kinetic energy of the molecules of the object is called its

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Heat

Temperature

Hotness

Coldness

If the bright fringe into be observed then we have relation

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Y = mLd/λ

Y = mλL/d

Y = λd/mL

Y = λL/md

Distance covered by a freely falling body in 2s will be

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4.9 m

19.6 m

29.2 m

44.1 m

Thermodynamics is the branch of physics deals with the conversion of heat energy into

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Electrical energy

Mechanical energy

Solar energy

None of these

When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is

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Velocity

Wavelength

Frequency

Amplitude

Light traveling through vacuum enters water which characteristic of light does not charge

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Velocity

Frequency

Wavelength

Amplitude

The displacement coincides with the path of motion when a body moves along a

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Straight line

Curved path

Zig Zag path

None of these

Newton's rings are:

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Rectangular

spherical

Concetric circles

None of these

According to Young s experiment if frequency of light used is halved then fringe width becomes

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2/3

Double

Remains constant

Fringe

During a negative β-decay

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An atomic electron is ejected

A neutron in the nucleus decays emitting an electron

An electron which already present within the nucleus is ejected

A part of binding energy of nuclei is converted into electron

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream line body

None of these

Which one of the following phenomenon cannot be explained on the bases of Huygen's theory?

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Refraction

Reflection

Diffraction

Formation of spectrum

Diameter of the nucleus is of the order of

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10^-10m

10^-12m

10^-15m

10^-18m

Amorphous materials have the properties of solids like

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No structure

Like liquid

Glassy

a and c

Viscosity of ethanol at 30^oC in Nsm^-2

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0.954 × 10^-3

1.000 × 10^-3

1.012 × 10^-3

1.014 × 10^-3

When interference of light takes place

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Energy is created in the region of maximum intensity

Energy is destroyed in region of maximum intensity

Conservation of energy hold goods and energy is redistributed

Conservation of energy does not hold good

Single mode step index fibre is used to send

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white light

green light

a strong monochromatic light

yellow light

Powered and remote control guided missiles are used for

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long ranges

short ranges

medium ranges

none of them

What is the average translational kinetic energy of the molecules in a gas at temperature 27 CC°

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5.62 x 10^-21J

5.96 x 10^-27J

6.21 x 10^-21J

6.29 x 10^-27J

The ratio of stress/strain is called as

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Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

The magnitude of velocity at any instant is

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Physical sciences deals with

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Living things

Nonliving things

Both living and non- living

Non of these

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

In conductors, the valence band and conduction bands are

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Touch each other

Overlapped each other

Largely overlapped

None of these

The axis of ration of an object will not change its orientation unless

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Internal torque acts

Internal torque acts in one direction

External torque acts

None of these

Which of the following have same SI units

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Force

Impulse

Momentum

B and C

When temperature increases, viscosity of liquids

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Remains constant

Increases

Decreases

Becomes double

The dimensions of co-efficient of viscosity are

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[ML^-1T^-1]

[ML^-2T^-1]

[ML²T^-3]

[ML³T^-1]

The light waves and radio waves differ in

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Speed

Frequency

Wavelength

Both B and C

The communication with any place on the surface of the Earth can be made by the wave/rays known as

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Infrared

Microwave

X-rays

Radio waves

Which of the following statements about angular momentums is correct?

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Angular momentum remains conserved

Angular momentum is the product of moment of inertia and angular velocity

Moment of inertia is directly proportional to angular momentum for constant angular speed

All of these

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

Which of the following statements for an object in equilibrium not true?

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The object must be at rest

The object can be at rest

The object is moving at constant

The acceleration of the object is zero

Why laser rays are used to measure long distance?

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Laser rays propagate in a straight

Laser rays are not absorbed

Laser rays are most coherent waves

Laser rays are high velocity waves

Young's modulus for tungsten is

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90

190

390

590

Frequency of red colour as compared to that of violet colour is:

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Equal

Smaller

Greater

None of these

The main reason for the high speed of bullet train is

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Magnetic effect

Reduced friction

Design of train

None of these

The rate at which the battery is supplying the electrical energy is the:

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Power output

Electrical power

Power input

Both A and C

Force due to water flow in which the water of mass 'm' strikes the wall in time 't' then force F on the water is

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The idea of Michelsion's interferometer is based on the

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reflection of light

interference of light

refraction of light

all of them

Rainbow is formed due to combination of

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Dispersion and total internal reflection

Reflection and refraction

Dispersion and focusing

Refection and scattering

Laws of reflection and refraction can also be explained by:

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Particle nature of light

Quantum nature of light

Wave nature of light

Complex nature of light

The critical temperature Tc for Aluminium is

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2.1 K

1.1 K

1.18 K

1.19 K

The kinetic energy of a body becomes four times its initial value.The new linear momentum will be

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Four times the initial value

Thrice the initial value

Twice the initial value

Same as the initial value

The band full of electrons, which donot play any part in the conduction process is known as

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Conduction band

Forbidden energy band

Valence band

Completely filled band

Such substance which break soon after crossing the elastic limit is called

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Weak substance

Ductile substance

Brittle substance

Organic substance

A rocket carries its own fuel in the form of a

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Liquid and oxygen

Solid and oxygen

Both

None of these

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

A thermodynamic process in which temperature of system does not change during heating

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Isobaric process

Isobar process

Isothermal process

Adiabatic process

What remains constant when the earth revolves around the sun?

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Angular momentum

Linear momentum

Angular kinetic energy

Linear kinetic energy

The charged nucleus of an atom itself spins its magnetic field is

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Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

What is the unit of the Young's modulus?

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N m^-2

N m^-1

N m

N m²

The relative permitivity for air at 1 atmospheric pressure is

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1.0002

1.0004

1.0006

1.0008

Unit of angular displacement is

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Degree

Revolution

Radian

All

The escape velocity of moon in Kms^-1 is

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1.23

2.43

2.40

2.59

The magnitude of i² in scalar product is

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Zero

1

Less than 1

Greater than 0

Two balls of different masses have same K.E then

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The heavier ball has greater momentum than the lighter ball

Lighter ball has greater momentum than the heavier ball

Both the balls have equal momentum

Both the balls have zero momentum

The work done by stretching force is the area of

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Trapezium

Triangle

Rectangle

None of these

Nms^-1 is the unit of

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Impluse

Power

Energy

Work

The combination of solenoid and a specimen of iron inside it make a power full magnet called

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Horse shoe magnet

Bar magnet

Electromagnet

10^-10 to 10¹⁸

The flow is said to be streamline or lamina when every particle

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Moves in different direction

Moves along the same path as

Slowly moves in one direction

None of these

When the fluid is incompressible, for which the density is

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Constant

Change

Both

None of these

The SI unit of torque is

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Nm^-1

Nm^-2

Ncm

Nm

An inertial frame of reference in which acceleration is

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Very high

Very very low

Zero

None of these

Longitudinal waves do not exhibit

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Refraction

Reflection

Diffraction

Polarization

Curie temperature is a point where:

Choose an answer

Diamagnetism changes to paramagnetism

paramagnetism changes to Diamagnetism

Ferromagnetism changes to paramagnetism

paramagnetism changes to Ferromagnetism

The domains are the small regions of the order of

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Millimeter

Micrometer

Micron

None of these

A thorium nucleus is formed when a uranium nucleus emits an 𝑎 −particles. Atomic number of thorium is :

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23

60

90

70

A hollow insulated conduction sphere is given a positive charge of 10μC.What will be the electric field at the centre of the sphere if its radius is 2 meters?

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Zero

5μC m^-2

20μC m^-2

8μC m^-2

In place of spark plug, the diesel engine requires also

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High speed air

High temperature air

Low temperature air

None of these

A man fires a bullet of mass 200 g at a speed of 5 m/s.The gun is of one kg mass.by what velocity the gun rebounds backwards?

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0.1 m/s

10 m/s

1 m/s

0.01 m/s

The theory which explains the vast diversity in an electrical behaviour of all types the materials is

Choose an answer

Free electron theory

Band theory

Theory based as chemical properties

None of these

Phase change of 180° is equivalent to a path difference of

Choose an answer

2λ

λ

λ/2

λ/4

Insulators are those material in which energy gap is

Choose an answer

very large (several eV)

very narrow (= 1ev)

either of them

none of them

When a radioactive nucleus remits a beta particle, the proton neutron ratio:

Choose an answer

Decreases

Increases

Remain same

None of the above

Even the small viscosity of the air causes a retarding force on car at high speed is

Choose an answer

Small

Large

Very large

None of these

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

Choose an answer

Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

On a diffraction grating a large number of close parallel equidistant slits are ruled on it

Choose an answer

By hand

electronically

mechanically

none of them

The high blood pressure is known as

Choose an answer

Diastolic

Systolic

High blood pressure

None of these

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

Choose an answer

115 m

1.15 m

11.5 m

0.115 m

Selenium is an

Choose an answer

Insulator

Conductor

Semiconductor

Photo conductor

The value of shear modulus is zero for:

Choose an answer

Water

Mercury

Diamond

Both (A) and (B)

Both (A) and (C)

A 2 kg body and a 2 kg body have equal momentum. if the kinetic energy of 3 kg body is 10 j. The K.E of 2 kg body will be

Choose an answer

6.66 j

15 j

22.5 j

45 j

Insulators are those materials in which valence band is

Choose an answer

Empty

Partially filled

Full

None of these

If the tension in a string stretched between two fixed points is made four times, the frequency of the fundamental harmonic will become:

Choose an answer

Two times

Three times

Four times

Six times

Conductors are those materials in which the free electrons

Choose an answer

Very large

Very small

Plenty of

None of these

When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is

Choose an answer

100 nm

10^-4 nm

10^-6 nm

10^-5 mm

The high blood pressure is

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100 torr

110 torr

120 torr

130 torr

The dimensions [ML²T^-2] refers to the quantity

Choose an answer

Work

Spring constant

Torque

Both A and C

To observe the phenomenon of interference of light, the light should be

Choose an answer

Monochromatic

Phase coherence

Coherent sources

All of these

At the maximum height the V_f is

Choose an answer

_Constant

Zero

Maximum

None of these

A glass plate on which a large number of very fine equidistant parallel lines are drawn is called

Choose an answer

convex lens

thin film

diffraction grating

interferometer

If no external torques act, the angular momentum of a body rotating about a fixed axis in two dimensions is

Choose an answer

Variables

Constant

Non conserved

None

For the monochromatic beam of X-rays, the crystal planes in a lattice act like a

Choose an answer

perfect absorbers

boundary

mirror

none of them

Light of wavelength 800 n m is incident on a pair of slits, forming fringes 4.0 mm apart on a screen. What is the fringe when light of 400 nm is used and the slit separation is halved?

Choose an answer

2.0 mm

1.0 mm

4.0 mm

0.5 mm

A charge of 10 C is moved along an equipotential surface having a potential of 2V. The work done is

Choose an answer

10 j

Zero

2 j

20 j

The vertical velocity component changes with

Choose an answer

Distance

Time

Height

Angle

Wave front is the locus or all points in vibration are in the same

Choose an answer

Frequency

Phase

Wavelength

All of these

In semiconductors, at 0 K, the electrons in conduction band is

Choose an answer

Partially filled

No

Yes

None of these

Numerical value of magnitude of a physical quantity is

Choose an answer

Independent of system of units

Directly proportional to magnitude of the unit

Inversely proportional to magnitude of the unit

Either (B) or (C)

Steel is preferred for making permanent magnets because it has

Choose an answer

Large retentivity and large coercively

Small retentively and small coercively

Large retentively and small soercively

Small retentively and large coactivity

The rate of change of angular momentum is

Choose an answer

The applied force

The moment of inertia

The applied torque

Impulse

Physics is an important and basic part of physical sciences which is a

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Mathematical science

Experimental science

Statistical science

None of these

Microwaves are used because they travel in a

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Narrow beam

Straight line

Easily pass through Earth atmosphere

All of these

To produce same acceleration in the bodies of masses 10 kg and 20 kg the force applied in the second body should be

Choose an answer

Halved

Equal for both bodies

Doubled

Three times

Rest mass energy of electron is:

Choose an answer

1.02 MeV

0.51 MeV

931 MeV

200 MeV

What is the S.I. unit of dipole moment ?

Choose an answer

cm

cm²

cm^-1

cm^-2

Power loss taken place when a light signal travels along fibres by

Choose an answer

Multiple reflection

Light absorbed due to impurities in glass

At joint some light is scattered by group of atoms

All of these

Velocity time graph can also be used to determine

Choose an answer

Distance

Velocity

Acceleration

None of these

The property of bending of light around obstacies is called

Choose an answer

interference

reflection

diffraction

polarization

The momentum of particle is numerically equal to its kinetic energy.What will be the velocity of the particle?

Choose an answer

4 m/s

1 m/s

2 m/s

None of these

A body weights 100 N on the surface of the earth. Its weight at a depth equal to half the radius of the earth is

Choose an answer

44.44 N

50 N

25 N

75 N

A planet is observed by an astronomical refracting telescope having an objective of focal length 16 m and an eyepiece of focal length 2 cm.

Choose an answer

The distance between the objective and the eyepiece is 8m

The angular magnification of the planet is 200

The image of the planet is inverted

The objective is smaller than the eyepiece

To observe interference of light the condition which must be met with is that the sources must be:

Choose an answer

Monochromatic

Phase coherent

Both of above

None of above

The energy dissipated per cycle for iron in hysteresis loop is

Choose an answer

less than for steel

equal to the steel

more than the steel

any one of them

A particle of mass 'm' at rest is acted upon by a force 'P' for a time 't' its kinetic energy after an interval 't' is

Choose an answer

P²t²/m

P²t²/2m

P²t²/3m

Pt/2m

If the water exists from the pipe at the rate 1.5 kgs^-1 at speed of 0.3 ms^-1. If the water strikes a wall normally, find the force on the wall is

Choose an answer

5.53 N

5.03 N

1.35 N

0.45 N

A man pushes a wall and fails to displace it. He does

Choose an answer

Negative work

Positive work but not maximum work

No work at all

Maximum positive work

Moment of inertia depends on mass and also on

Choose an answer

r

r²

r³

None of these

Source of light used in the fibre optic communication

Choose an answer

Led

Laser

Photo diode

Both a and b

Cladding in an optical fiber is used to

Choose an answer

Absorb unneccessary light

Produce total internal reflection

Transmit light

Filter light

Energy stored in a capacitor is

Choose an answer

E = 1/2 C²V²

E = 1/2 C^-1V²

E = 1/2 CV²

E = C²V²

If unit of length mass and time each be doubled the unit of work done is increased by

Choose an answer

4 times

6 times

8 times

2 times

The source in the heat engine is at

Choose an answer

Low temperature

High temperature

Zero temperature

None of these

For which position will be maximum blood pressure in a body have the smallest value

Choose an answer

Standing upright

Sitting relaxed

Lying horizontally

Standing on one's head

Longitudinal strain can be produced in

Choose an answer

Glass

Water

Honey

Hydrogen gas

At 0 K a piece of Ge and Si is a perfect

Choose an answer

Conductor

Insulator

Semiconductor

None of these

A unit set is the smallest basic structure which is:

Choose an answer

One dimensional

Two dimensional

Three dimensional

Four dimensional

None of these

The velocity-time graph of a car is a straight line which rises the same height for equal intervals of time, if it moves with

Choose an answer

zero velocity

constant velocity

zero acceleration

constant acceleration

Electric flux depends upon

Choose an answer

The charge only

Medium only

Both charge & medium

Permittivity & area

The velocity of efflux is 100 m/sec and area of hole is 0.06 cm²how much volume of water will flow out of hole in one second

Choose an answer

6.0 x 10-⁴m³

6.0m³

600m³

6.0cm³

The maximum number of isomer for an alkene with the molecular formula C2H8

Choose an answer

2

3

4

5

On hydrolysis sucrose gives:

Choose an answer

glucose and maltose

fructose and lactose

fructose and maltose

glucose and Fructose

Empirical formula of monosaccharide is

Choose an answer

(CHO)_n

CH_nO_n+1

C_nH₂O

(CH₂O)_n

Group of element belongs to IIB group

Choose an answer

Zn. Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

Which gas is not a constituent of atmosphere?

Choose an answer

Xe

O₃

H₂

F₂

Units of van der Waals constant a is

Choose an answer

atm dm⁶/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁶/mol²

None of these

The value of R in term of dm³torr k^-1mol^-1

Choose an answer

62400

62.4

8.313

0.0821

.The number of moles in 2.24 dm3 of H2 gas at STP is:

Choose an answer

1

0.1

10

0.01

Polymerization process was classified in

Choose an answer

1926

1927

1929

1931

At different temperature, the vapour pressure of water is

Choose an answer

different

same

low

high

Coinage metals Cu. Ag, and Au are the least reactive because they have

Choose an answer

Negative reduction potential

Positive reduction potential

Negative oxidation potential

Positive oxidation potential

Industrial materials and thermal power stations are coated by

Choose an answer

PVC

Polyester

Epoxy resin

PVA

Polysaccharides are

Choose an answer

Polyester

Polyamides

Poly ethers

Polynucleotide

Keeping the temperature constant, if the gas is expended:

Choose an answer

Kinetic energy of molecules will increase.

Number of gas molecules increases.

Temperature will increase.

Pressure will decrease.

Name the compound, which shows geometric isomerism

Choose an answer

I-bromo-2-chloropropene

2.3-dimethy lpropene

2-pentene

Both A & B

In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate

Choose an answer

2 order

3 order

1st order

Zero order

Which is the chemical formula of calcium super phosphate:

Choose an answer

CaH₂PO₄

CaHPO₄

Ca(H₂PO₄)₂

none of above

Which one of the following enzymes brings about the hydrolysis of fats?

Choose an answer

Urease

Maltase

Zymase

Lypase

When the concentration of product is increased the instantaneous rate of reaction with reference to reactants will be

Choose an answer

Positive

Negative

the same

falling curve

Dichlorodifluoromethane, CC/2F2 has been used in aeroso propellants and as a refrigerant.
Which statement helps to explain why dichlorodifluromethane is chemically inert ?

Choose an answer

The carbon-fluorine bond energy is large

The carbon-fluorine bond has a law polarity

Fluorine is highly electronegative

Fluorine compound are non-flammable

Which of the following polymer has application in paper industry

Choose an answer

Starch

Glycogen

Protein

All

What is the weight of 10 litres of CO₂at 27°C and 2 atm?

Choose an answer

89.3 g

36.1 g

125 g

127 g

Oxides of sulphur react in atmosphere by various reactions to form:

Choose an answer

sulphates

sulphites

sulphides

sulphate aerosols

Formalin contains-------% alcohol.

Choose an answer

37

80

8

52

NH₃shows a maximum boiling point among the hydrides of Vth group elements due to

Choose an answer

very small size of nitrogen

hydrogen bonding between its molecules

enhanced electronegative character of nitrogen

pyramidal structure of NH₃

Which of the following is not the application of plasma

Choose an answer

Fluorescent light bulb

Removal of hazardous chemical

Neon signs

Corrosion effective

Bragg's law is given by equation

Choose an answer

n λ = 2 θ sin θ

nλ = 2 d sin θ

2nλ = d sin θ

n λ= 1/2 d sin θ

The energy produced by a carbohydrate is

Choose an answer

3 kcal/gm

2 kcal / gm

6kcal / gm

4 kcal/ gm

Which of the following undergoes easy dehydration?

Choose an answer

3-MethyIbutan-2-ol

Ethanol

2.Methylpropan-2-ol

Methanol

An ideal gas cannot be liquefied because

Choose an answer

Its critical temperature is always above 0°C

Its molecules are relatively small in size

It solidifies before becoming a liquid

Forces operative between its molecules are negligible.

What forces operate between ethyl group of ethyl alcohol and oxygen of water

Choose an answer

H-bonding

attractive forces

repulsive forces

dipole forces

Which of the following gases diffuse quickly:

Choose an answer

N₂

NH₃

CO₂

Cl₂

Which of the following gases shows more ideal behaviour at 0°C

Choose an answer

H₂

CH₄

He

NH₃

What will be the ratio of volume of equal masses of O₂, H₂and CH₄kept in same container under same conditions

Choose an answer

2 : 16 : 2

1 : 16 : 2

2 : 16 : 1

1 : 2 : 1

Hardness of diamond is attributed to the

Choose an answer

strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

Choose an answer

M/V

RT/M

PM/RT

V/M

Nylon 6,6 is a condensation polymer of:

Choose an answer

Phthalic acid and hexa ethylene diamine

adipic acid and hexaethylene diamine

phthalic acid and glycerol

The deviation of a gas from ideal behaviour is maximum at

Choose an answer

-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

Activity of the enzyme is reduced by

Choose an answer

temperature

concentration

pH

inhibitors

one gram of carbohydrate yields energy:

Choose an answer

10kcal

100kcal

4kcal

9kcal

During thunderstorms, water dissolves

Choose an answer

Dust particles

HCl

Nitric acid

Clouds

One of the following is a ionic solid. Which is that?

Choose an answer

Fe

KBr

Diamond

Cr

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

Choose an answer

Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

Polypeptides are formed from amino acids by

Choose an answer

Oxidation

Addition

Condensation

Reduction

The substances added in paints for improving the mechanical properties is called:

Choose an answer

pigmein

filter

stabilizer

binder

Ph of unpolluted rain water is

Choose an answer

07

Less than 6

5.6

Less than 5

Which is a good nucleophile as well as a good leaving group?

Choose an answer

F-

Cl-

Br-

I-

Plastic, rubber, synthetic fibers belong to macromolecules:

Choose an answer

Inorganic

organic

Biopolymer

synthetic

Deposition of cholesterol in arteries is responsible for:

Choose an answer

Heart attach

diabetes

hepatitis

cancer

Vegetable oils are

Choose an answer

Unsaturated fatty acids

Glycosides of unsaturated fatty acids

Glycosides of saturated fatty acids

None

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

Choose an answer

2 day

6 day

5 day

7 day

Evaporation of liquid takes place at every temperature. What when temperature becomes constant?

Choose an answer

the rate of condensation is greater than teh rate of condensation

it depends upon the nature of the liquid

rate of evaporation is greater than the rate of condensation

the rate of condensation and evaporation become equal

Which is used as a coagulant:

Choose an answer

Ferric salts

Potash alum

a and b both

Chlorine

Which value is designated as absolute zero or zero of the Kelvin scale?

Choose an answer

-273.15°C

-173.15°C

273°C

none of these

Which of the following is a base according to lowery Bronsted concept?

Choose an answer

I-1

HCl

H3O+

NH4+1

With increase in temperature, ionic product of H2O

Choose an answer

Decreases

Remains same

Increases

May increase or decrease

Which of the following compounds does not exhibit positional isomerism?

Choose an answer

Alkynes

Nitroalkanes

Carboxylic acid

Alcohol

Chloroform (CHCl3) is?

Choose an answer

Primary alkyl halide

Secondary alkyl halide

Tertiary alkyl halide

a liquid

The crystals formed due to London forces of interaction are

Choose an answer

ionic

covalent

molecular

metallic

Which of these polymers is a synthetic polymer

Choose an answer

Starch

Animal fat

Polyester in an addition polymer

Cellulose

Glucose forms a polymer which is stored in liver the name of this polymer is:

Choose an answer

glycogen

starch

cellulose

arnylose

Potency and turn over are terms related to:

Choose an answer

enzymes

proteins

fats

oils

By convention, the standard heat of formation of all elements is assumed to be

Choose an answer

Zero

positive

Negative

Infinity

What is the numerical value of 'R; (the gas constant) in S.I units?

Choose an answer

83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

The partial pressure of 0₂in the lungus is

Choose an answer

116 torr

159 torr

560 torr

760 torr

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

Choose an answer

10 isomers

3 isomers

5 isomers

6 isomers

Ocean contains part earth's water:

Choose an answer

95%

96%

97%

98%

Ecology is a science of environment and deals specially with

Choose an answer

stratosphere

biosphere

lithosphere

hydrosphere

The geometry of diamonds is

Choose an answer

tetragonal

cubic

rhombohedral

none of these

The gases law describe the ______ Behaviour of gases

Choose an answer

Variable

Constant

Uniform

Best

Which three element are needed for the health growth of plants:

Choose an answer

S,S,P

N,Ca,P

N,P,K

N,K,C

Plastic are pollution problem because many plastics

Choose an answer

Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic product

In a given system, water and ice are in equilibrium, if the pressure is applied to the above system then

Choose an answer

Morc ice is formed

Amount of ice and water will remain the same

more ice is melted

both A and B

The emf produced by galvanic cell is called

Choose an answer

Cell potential

Oxidation potential

Redox potential

Reduction potential

Iodine number of an oil indicates its:

Choose an answer

molecular weight

purity

degree of unsaturation

acidic strength

Nylon 6 6 is prepared by the reaction of hexamethylene with

Choose an answer

formic acid

acetic acid

adipic acid

none of these

Combustion analysis is performed for the determination of

Choose an answer

Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

The pH range of acid rain is?

Choose an answer

7-6.5

6.5-6

6-5.6

Less than 5

The layer of earth around the earth is called:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

Biosphere

Pathogens in raw water are killed in step:

Choose an answer

aeration

coagulation

chlorination

treatment

The particles in solids are

Choose an answer

widely separated and moving randomly

widely separated not moving

moving randomly but not separated

close together and vibrating slightly

State of hybridization of carbon in the carbocation is

Choose an answer

sp3

sp

sp2

dsp2

Unit of ozone is?

Choose an answer

Debye

Dobson

Esu

Coulumb

Collagen is a fibrous protein present most abundantly in

Choose an answer

heart

nucleus

connective tissues

Arteries

Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order

Choose an answer

+7.+6.+2,+4

+6,+7,+2,+4

+7. +6.+4.+2

+4, +6, +7,+2

Micro nutrients are required in quality ranging from:

Choose an answer

4g - 40g

6g - 200g

6dg - 200kg

4kg - 40kg

Which of the following statement is not true?

Choose an answer

The pressure of a gas is due to collision of the gas molecules with the walls of the container.

The molecular velocity of any gas is proportional to the square root of the absolute temperature.

The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.

Kinetic energy of an ideal gas is directly proportional to the absolute temperature.

When the concentration of reactants is taken as unity the rate of reaction is equal to

Choose an answer

average rate

concentratian of reactant

instantaneous rate

specific rate constant

Which is not a steroid

Choose an answer

Cholesterol

Ergosterol

Phospholipids

None of these

The partial pressure of CH₄and O₂are 500 torr and 100 torr repectively in a 10 dm³vessel at 0°C. The ratio of number of molecules of CH₄: O₂is

Choose an answer

1: 2

5 : 1

5 : 2

2 : 1

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

Choose an answer

Eyes

Ears

Stomach

Nose

In voltaic cell a saht bridge is used in order to

Choose an answer

Pass the electric current

Prevent the flow of ions

Mix solutions of two half cells

Allow movement of' ions between two cells

The nature of the attractive force in acetone and chloroform are

Choose an answer

dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

instantaneous forces

In [Ti (H2O)]3+ which colour is transmitted

Choose an answer

Yellow

Blue and red

Blue and yellow

red and yellow

The substances which soften the polymer are called

Choose an answer

stabilizers

plasticizers

retarders

pigments

At constant temperature when pressure of a gas is plotted against volume, the curve is:

Choose an answer

Slanting straight line.

Parabolic.

Straight line, parallel to pressure axis.

Of neither type.

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

Choose an answer

H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Which of the following configurations corresponds to alkaline earth metals?

Choose an answer

[Ar] 3d10, 4s2

[Ne] 3d2, 3p2

[Ar] 4s2

[Ar], 3d10, 4s1

Rusting of iron is the example of

Choose an answer

Fast

Slow

moderate

depends upon conditions

Which is property of CO?

Choose an answer

Soluble in water

Insoluble in water

No toxic

Pole coloured

Ar has low critical temperature and pressure due to its

Choose an answer

small size

monatomic molecule

low polarizability

liquefaction temperature close to room temperature

Which of the following statements is incorrect about vitamins

Choose an answer

often function as coenzymes

molecules contain at least one ring structure

are often synthesized by the body

are polyfunctional compounds

Which liquid is more volatile?

Choose an answer

water

mercury

benzene

honey

To prepare ethane by Wurtz synthesis the suitable alkyl halide is

Choose an answer

Ethyl iodide

any alkyl iodide

Ethyl chloride

Methyl bromide

At same temperature which substance has high kinetic energy:

Choose an answer

Liquid water

N₂gas in a container

Solid piece of iron

Solution of alcohol and water

The rigid rocky part of earth crust called lithosphere extends upto a depth of:

Choose an answer

10 km

100 km

1000 km

1500 km

Which of the following is derived lipid

Choose an answer

Sterols

Vit D

Terpenes

All

The polymers which can not be re-softened again and again are called

Choose an answer

Thermoplastic

Thermosetting

Both a and b

None

Someone is saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has :

Choose an answer

definite shape

definite-volume

crystalline structure

no crystalline structure

Correct statement about Nucleophilic substitution bimolecular is

Choose an answer

Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

Amorphous means

Choose an answer

arranged

ordered

shaped

shapeles (no arrangements)

Esters have fruity smell and are used as artificial favours. Amyl acetate gives flavour of

Choose an answer

Banana

Jasmine

Pineapple

Orange

Which process of ester will yield carboxylic acid?

Choose an answer

Hydration

Hydrolysis

Oxidation

Reduction

coordination number of N^a+ in NaC is:

Choose an answer

1

2

4

6

Sponification is the hydrolysis of fats or oil with an/a:

Choose an answer

enzyme

me5tallic ion

acid

alkali

Coenzymes are the species which increase the activity of enzymes. They are chemically

Choose an answer

Metal ions

non-metals

Organic acids

Organic bases

Sterols, vitamin D and terpenese belong to

Choose an answer

Simple lipids

Complex lipids

Derived lipids

None

The mechanism of polymerization involves free addition Polymerization or condensation polymerization, Choose the correct statement:

Choose an answer

Polyester is an addition polymer

polythene is an addition polymer

polyviny chloride (PVC) is a condensation polymer

Polystyrene

In order to determine ∆H (latt) of ionic compound which is correct relationship

Choose an answer

∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

Which woody raw material is used for the manufacture of paper pulp?

Choose an answer

cotton

bugases

poplar

rice straw

The height of the peak in the mass spectrum shows

Choose an answer

Number of isotopes

Relative abundance

Mass number

Number of protons

The shielding effect of inner electron is responsible for

Choose an answer

Having no effect on ionization energy

Decreasing ionization energy

Increasing ionization energy

Increasing electronegativity

The addition compound obtained by reacting acetaldelyde and HCN, when Iydrolyzed gives

Choose an answer

Ethyl alcohol

Methyl cyanide

2-Hydroxy propanoic acid

Ethyl cyanide

Furan is a compound

Choose an answer

Acyclic

Alicyclic

Heterocyclic

non-aromatic

The potential difference set up at 25 C and 1 atm when clectrode is dipped m Tis one molar ionic sohution is called

Choose an answer

Single electrode potential

electrode potential

Standard electrode potential

Standard hydrogen electrode

The destruction of the biological nature and activity of proteins by heat or chemical agent is called:

Choose an answer

Dehydration

Oxidation

Denaturation

Polymerization

Which substance among the following used in points to improve the mechanical properties?

Choose an answer

filter

binder

pigment

stablizer

London dispersion forces are the only force present among the:

Choose an answer

molecules of water in liquid state

atoms of helium in gaseous state at high temperature

molecules of solid iodine

molecules of hydrogen chloride gas

The active group of glutathione is

Choose an answer

Amino group

Sulfhydryl group

Carboxylic group

Imino group

A fat or oil is characterized for extent of unsaturation by one of the following number. Which one is

Choose an answer

Acid number

Saoilucfucation number

Rancidity number

Iodine number

Surface tension is measured by

Choose an answer

viscometer

barometer

stalagmometer

manometer

The rate of diffusion of a gas is inversely proportional to:

Choose an answer

Density of a gas

Velocity of the gas

Viscosity of the gas

All of above

London forces are

Choose an answer

stronger than dipole-dipole interactions

weaker than dipole-dipole interactions

equal to dipole-dipole interactions

sometimes stronger and sometimes weaker than dipole-dipole interactions

Which of these the most widely used nitrogen fertilizer in Pakistan?

Choose an answer

urea

ammonium nitrate

ammonium sulphate

ammonium chloride

H₂and O₂are enclosed in porous vessel. The effusion of these gases will take place like

Choose an answer

H₂effuses 4 times the rate of effusion of O₂

O₂effuses into air 4 times the effusion of H₂

both effuse at same rate

H₂effuses at 8 times the rate of effusion of O₂

Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water

Choose an answer

Rain

Live stock waste

Oil leaks and spills

Disposal of industrial effluents

For a chemical reaction which can never be a fractional no

Choose an answer

order

molecularity

half-life

rate constant

The relationship between volume of a given amount of gas and prevailing conditions of temperature and pressure are:

Choose an answer

Charle's law

Graham's law

Boyle's law

Gas laws

Gases are effused through a whole due to ______ motion

Choose an answer

Vibration

Rotaional

Translational

Chaotic

Cotton has cellulose in it:

Choose an answer

96%

97%

98%

99%

Mostly ionic compounds are produced between elements of group

Choose an answer

IA and IIA

IB and VIB

IA. IIA and VII-A

IA and IB

Which ion has maximum number of unpaired electrons in 3d subshell and shows maximum paramagnetic behavior?

Choose an answer

Cr+3

Ni+2

Co+2

Fe+3

To purify water which has mud dissolved in it, a substance which coagulates the suspended particles is used.

The coagulant may be

Choose an answer

Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

All the Hydrolytic reactions are

Choose an answer

First order

Second order

Third order

pseudo-first order

The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:

Choose an answer

the atomic mass Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent than between he atoms

rn atomic number of Rn is larger than that of He

How many isotopes are present in palladium

Choose an answer

Two

Four

Six

nine

The heat of hydrogenation of most of the alkene is about

Choose an answer

120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

The number of paper industries in Pakistan are

Choose an answer

30

25

35

20

In Pakistan consumption per person is:

Choose an answer

8kg

5kg

10kg

6kg

Commonly used coagulants are ions of:

Choose an answer

Ferrous

Al

Cr

Ferric

In which system hydrogen bonding is not present

Choose an answer

solution of ethanol in water

linking of helix in protein molecule

structure of ice

solution of NaCl in benzene

Covalent bond is

Choose an answer

A weak bond

A true chemical bond

A hydrogen bond

Responsible for secondary structure of protein

Elimination unimolecular reactions involve

Choose an answer

Second order kinetics

First order kinetics

Third order kinetics

Zero order kinetics

The layer of gases around the earth are called?

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

All of these

The development of disagreeable odour in fats or oil is called

Choose an answer

fragrance

perfume

rancidity

smell

The enzymes that catalyse the addition or removal of ammonia are:

Choose an answer

Lyases

Ligases

Transferases

Kinses

Addition of washing soda removes

Choose an answer

Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

Which substances do not react immediately with bromine water

Choose an answer

Wthane

Benzene

Ethene

Phenol

The strongest conjugate base is

Choose an answer

OH-

CH3O-

C6H5O-

CH3COO-

Transportation causes to produce CO₂ in atmosphere:

Choose an answer

72%

73%

74%

75%

Cellulose is the polymer of

Choose an answer

α-D-glucose

β-D-glucose

Fructose

None

Ozone acts as:

Choose an answer

Pollutant

saver

oxidatant

All of these

Optimum PH for enzyme pepsin is

Choose an answer

01

2

05

6.5

A complete food contains at least:

Choose an answer

three nutrients

ten nutrients

six nutrients

eight nutrients

Identify the linear polymer out of following

Choose an answer

Amylose

Amylopectin

Starch

Glycogen

When a compressed gas is allowed to expand into a region of low pressure, it produce:

Choose an answer

Vapours

Cooling effect

Heating effect

None of above

The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is

Choose an answer

Addition reaction

C-H bond cleavage

Elimination reaction

Combustion reaction

The material possessing superconducting properties is

Choose an answer

Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

Bond will be covalent when electronegativity difference of bonded atom is

Choose an answer

Equal to 1.7

between 0.5 to l.7

Greater to 1.7

zero

Ethanol reacts with sodium metal to liberate

Choose an answer

CO2 gas

CO gas

H2 gas

Steam

In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to

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electron pool theory

molecular orbital theory

valence bond theory

electrostatic force of attraction

Properties of polymeric material depends upon

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Chemical composition

Structure of molecule

Boiling point

Both A and B

Phenol is completely soluble in water above

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25°C

62.3℃

68.5°C

66.50°c

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

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1/3

8/9

1/9

16/17