Question # 1

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

Heat is a form of

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Power

Work

Energy

Motion

Plane microwaves are incident on a long slit having a width of 5 cm.The wavelength of the microwaves if the first minima is formed at 30° is

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25 cm

5 cm

2.5 cm

5 mm

Which mode can carry more than 14 TV channels or 14000 phone cells?

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single mod step index

multimode step index

multimode graded index

all of them

Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow, the pressure of water at this place

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Increases

Decreases

Remains same

Depends upon several factors

The reason why weight exists is that

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the earth exerts gravitational force on objects

both the earth and any object on it has mass

gravity exists

All of them

The blood pressure of man

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Increase with age

Decrease with age

Remains same

Cannot predicted

Salters duck is consists of

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Duck float

Body float

Balance float

a and c

The temperature at which the vibrations become so great that structure of the crystal breaks up, is called:

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Critical temperature

Temperature of vaporization

Melting point

Both A and C

Both A and B

Chimney works best when it is

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Tall

Short

Of any shape

Insufficient statement

In the Newton's ring, as we proceed towards the periphery of the lens, the thickness of air film

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gradually decreases

gradually increases

suddenly becomes zero

all of them

When a silicon crystal is doped with a trivalent element, then the atom of the trivalent element is known as

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acceptor

donor

either of them

none of them

The expression for the terminal velocity V_t is given by

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V_t = mg/36πη

V_t = mg/6πηr

V_t = mg/6πηa

V_t = mg/6π²ηr

Range of projectile is maximum when thrown at an angel of

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30°

60°

45°

75°

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

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

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1.6 × 10^-3

1.595 × 10^-3

1.67 × 10^-3

1.69 × 10^-3

A boat which has a speed of 5 km/h in still water crosses a river of width 1 km along the shortest path in 15 minutes.The velocity of the river in km/s is:

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1

3

4

√41

You are traveling in a car during a thunder storm. In order to protect yourself from lightning you would prefer to

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Remain in car

Take shelter under tree

Get on and lie flat on the ground

Touch the nearest electric pole

Newton's rings are formed due to

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Refraction of light

Diffraction of light

Interference of light

None of these

Which of the following statement about centripetal and centrifugal force is correct

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They are oppositely directed

They cancel each other

Both are on the same body

None of these

A spectrometer is an optical device used to study the spectra from different sources of light which is

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Absorption spectra

Emission spectra

Discrete spectra

None of these

The relation for time of flight is

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The locus of all points in a medium having same phase of vibration is called:

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Crest

Trough

Wavelength

Wavefront

Donor impurities donate

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Holes

Electrons

Both holes and electrons

None of them

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

The modulus of elasticity of material does not depend upon

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Shape

Temperature

Nature of material

Impurities mixed

The ultimate tensile strength (UTS) can be regarded as the

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Maximum strength of the material

Nominal strength of the material

Minimum strength of the material

None of these

Snell's Law is defined as

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n1 sin θ₂ = n₂ sin θ

n sin θ₁ = n₁ sin θ₂

n₁ sin θ₁ = n₂ sin θ₂

None of these

A diode characteristics curve is a graph plotted between;

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Current and time

Voltage and time

Voltage and current

Forward voltage and reverse current

If a raindrop with a mass of 0.05 g falls with constant velocity the retarding force of atmospheric firction is neglect density of air

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Zero

49 dynes

490 N

49 N

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

Bulk modulus for glass is

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2

31

36

42

A voltage of 600V can be obtained virtually from

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Dry battery

Nickel cadmium battery

Head and tail of cell

Transformer

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

The high blood pressure is known as

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Diastolic

Systolic

High blood pressure

None of these

The diffraction grating is used to measure

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wavelength of light

focal length of a lens

refractive index of prism

polarization of light

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

The unpolarized light is

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An ordinary incandescent bulb

Sun

Moon

All of these

In diffraction grating has feature/features like

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A glass plate

A large numbers of lines are ruled

Spacing between two lines acts as a slit

All of these

The property of bending of light around obstacies is called

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interference

reflection

diffraction

polarization

1 year = ______.

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3.1536 x 10⁷s

3.1536 x 10^-7s

3.1536 x 10¹⁰s

3.1536 x 10^-10s

SI unit of water equivalent of electrons is

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Kg

Kg²

Kg³

Kg¹

The unit of torque in SI system is

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Newton-meter

Dyne-meter

Newton

Joul

Can two lights of car can produce interference

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Yes

No

Partly produce interference

None of these

In a photocell, cesium coated oxidized silver emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

The blending of light when it passes from one medium to another is known as:

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Refraction

Interfarance

Polarization

Both (B) and (C)

What will be the colour of the sky as seen from the earth if there were no atmosphere ?

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Black

Blue

Orange

Red

By convention, the torques are taken as negative if they are in the

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downward direction

leftward direction

clockwise direction

anticlockwise direction

Viscosity is the property by virtue of which a liquid

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Becomes spherical in shape

Occupies minimum surface area

Oppose relative motion between layers

Tends to regain its deformed position

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

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0.015 × 10^-3

0.019 × 10^-3

0.151 × 10^-3

0.0179 × 10^-3

The energy gap is insulators becomes very large and has the value

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Few electron volt (eV)

Some electron volt (eV)

Several electron volt (eV)

None of these

Using a graded index fibres the time difference is reduced to about

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0.5 ns per km

1.0 ns per km

2.0 ns per km

2.3 ns per km

If the force applied is F and the velocity gained is v,then the power developed is

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F/v

v/F

FV

Fv²

Earth is considered to be

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a non-inertial frame

an inertial frame

an accelerated frame

none of the above

The gravitational pull of earth on a mass of 20 kg on the surface of earth is

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20 N

196 N

19.6 N

1960 N

If a metallic bob is suspended by a string in the vertical place, it will be in?

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complete equilibrium

translational equilibrium

rotational equilibrium

none of them

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

When two surface are coated with a lubricant,then they

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Stick to each other

Slide upon each other

Roll upon each other

None of these

The approximate efficiency of steam turbine is

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35 - 46%

40 - 43%

29 - 36%

30 - 47%

Mathematically the vertical velocity component is

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The high blood pressure is

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100 torr

110 torr

120 torr

130 torr

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

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Conductor

Insulator

Semiconductor

None of these

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

The examples of diamagnetic substances

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Water

Copper

Antimony

All of them

The domains are of macroscopic size of the order of

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centimetres

metres

millimetres

nanometres

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

The weight of man is an elevator descending down with an acceleration of 9.8 ms^-2will become

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Half

Double

Unchanged

Zero

The difference between two separated positions are given as X₁ = 10.5 ± 0.1 cm and X₂ = 26.8 ± 0.1 cm. What is their absolute uncertainty

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1.63 ± 0.1 cm

16.3 ± 0.2 cm

3 ± 0.1 cm

16.3 ± 0.05 cm

A highly irreversible process is

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Expansion

Explosion

Compression

None of these

The torque is maximum when the angle between F and r is

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0^o

90^o

180^o

275^o

In photo phone modulated beam of reflected sun light focused on a detector several hundred meters away with the divice

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Germanium

Selinium

Silicon

None of these

For fast moving particles, such as atomic particles in an accelerator, the following branch of physics is applicable

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newtonian mechanics

classical mechanics

relativistic mechanics

all of them

Velocity is a

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Scalar quantity

vector quantity

constant quantity

none of them

Two forces of 12 N and 8 N act upon a body.The resultant force on the body has a maximum value of:

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4 N

0 N

20 N

8 N

The range of the projectile means a body covers horizontal distance which is

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Maximum

Minimum

Distance

None of these

The light source in the transmitter can be either

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Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

If force of friction is negligible, then acceleration of two free falling objects of different masses is

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The same

Different

Smaller mass has smaller acceleration

None of these

Dolphins have bodies to assist their movement in water are

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Irregular bodies

Closer to streamline body

Stream lined bodies

None of these

The velocity-time graph is a horizontal straight line when the velocity of the car is

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zero

constant

decreasing

increasing

Diffraction is concerned with the superposition of

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very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

Which pair of the following force will never give resultant force of 2N?

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2 N and 2 N

1 N and 1 N

1 N and 3 N

1 N and 4 N

The property due to which the size or shape of a lattice is not important is called

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Cleavage

Anisotropy

Homogenity

None of these

When the torque acting on a system is zero, which of the following will be constant

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linear momentum

angular momentum

impulse

force

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According to Huygen,every point on a wavefront may be regarded as a.........of secondary wavelets.

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Base

Source

Producer

Origin

The SI unit of momentum is

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Kgms^-1

Kgms^-2

N.S

a and c

Carnot cycle is:

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Reversible

Irreversible

Sometimes A, Sometimes B

None of these

A 1500 kg car has its velocity reduced from 20 ms^-1to 15ms^-1in 3.0 S. How large was the average retarding force

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-4.5 KN

-2.5 KN

-3.7 KN

-4.3 KN

A shortsighted person can see clearly

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Near objects

Far objects

Objects at 25 cm

Objects at infinity

Newton's second law of motion is also called

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Law of inertia

Law of acceleration

Law of force

None of these

Insulators are those material in which energy gap is

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very large (several eV)

very narrow (= 1ev)

either of them

none of them

In a hydroelectric power station, the height of the dam is 10 m. How many kg of water must fall per second on the blades of a turbine in order to generate 1 MW of electrical power ? Take g = 10 ms^-2

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10³ kgs^-1

10⁴ kgs^-1

10⁵ kgs^-1

10⁶ kgs^-1

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

Shear modulus for tungsten is

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50

100

150

200

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

Why is the weight of an object approximately the same at all points on the earth?

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the gravitational field is uniform

equal force is exerted on the object at points equidistant from the centre

weight is unaltered by attitude

weight of an object varies with its distance from earth

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^-10m?

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microwave

infrared

ultraviolet

X-ray

The two forces of a couple do not follow the rule that

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They act on the same angle

They act in the opposite directions

They have same directions

They cancel out each other

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

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25 Hz

70.7 Hz

50 Hz

100 Hz

Two forces of 6 N and 8 N can produce a resultant of

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0 N

1 N

10 N

18 N

During adiabatic expansion change of 2 moles of gas the internal energy is 100 j, the work done this expansion is

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Zero

-100 J

200 J

100 J

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

Name of projectile is the same for the following pair of angles:

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0° and 45°

35° and 55°

15° and 60°

30° and 75°

For atomic nucleus, the binding energy per nucleon with increase in mass number:

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Increases continuously

Remains same

Decrease continuously

First increases and then decreases with increase in mass number

The torque is zero when the angle between F and r is

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90^o

180^o

270^o

0^o

The venturi meter is a device used to measure the fluid

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Pressure

Quantity

Temperature

Speed

The electrical behavior of semiconductor depends on the material purity which is

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Sensitive

Extremely sensitive

Non-sensitive

None of these

The typical wavelength of the signal which we sent in the optical fibre is

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1000 nm

100 m

1.3 mn

1.3μm

Pressure exerted by a gas in merely momentum transferred to the walls due to the continuous collisions of molecules of the gas

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Per unit area

Per sec per unit area

Certain area

None of these

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variables velocity

uniform velocity

A charge -4 μ C is at origin and +16 μ C is at a distance 3 m on positive x-axis the zero field is located at

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3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

Which one is least multiple?

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exa

femto

atto

nano

The SI units of acceleration is

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LT

LT^-1

LT^-2

L²T^-2

Which of the following statements correctly describes the properties of two forces acting as a couple

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Equal, parallel and collinear

Unequal, anti-parallel and no-collinear

Unequal, anti-parallel and collinear

Equal, anti-parallel and non-collinear

The materials in which there are plenty of free electrons for electrical conduction are known as

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conductors

insulators

semi-conductors

all of them

The viscosity of glycrine is

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0.019x10^-9 Nsm^-2

0.801x10^-6 Nsm^-2

6.29x10^-3 N-sm^-2

6.29x10³ Nsm^-2

The rotational analogue of force is

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Torque

Momentum

Moment of inertia

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

As we go above the surface of earth the value of 'g'

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Increase

Remain Constant

Decrease

Increase slightly

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

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

The capacity of a parallel plat capacitor depends on the

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Type of metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

The units of the temperature coefficient of resistant are

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ΩK^-1

K^-1

ΩK

(ΩK)^-1

The ballistic missiles are useful for

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Short ranges

Long ranges

Medium ranges

None of these

At the highest point, we can claim that:

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Resultant velocity is zero

Only horizontal component of velocity is zero

Only V_yis zero

Nothing of above

A sun rise or sun set the sun looks reddish because

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The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

Who proposed wave theory of light

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Huygens

Galileo

Einstein

Newton

Fringe spacing in YDS experiment will be maximum if we use:

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Red light

Green light

Violet light

Blue light

If force and displacement of particle in the direction of force are doubled.Work would be

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Double

4 times

Half

1/4 times

At what distance should a book be placed from a 50 Cd bulb so that the luminance on the book becomes 2 Im m^-2

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50 m

10 m

5 m

1 m

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

During the projectile motion, the vertical component of velocity

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changes with time

becomes zero

becomes maximum

all of them

Confining the light vibrations in one plane is called:

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Reflection of light

Interference of light

Polarization of light

Diffraction of light

The magnitudes of vectors A.B and C are 3,4 and 5 units respectively.If A + B = C the angle between A and B is:

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π/2

cos^-1 0.6

tan^-1 7/5

π/4

The Bernoulli's equation often expressed in

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P + ρV² + ρgh = constant

P + 1/2 ρV + ρgh = constant

P + 1/2 ρV² + ρgh = Constant

P + 1/2 ρV² + gh = constant

Equal charges are given to two spheres of different radii The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both sphere

Depend on the nature of material of sphere

If the line of action of force passes through the axis of rotation or origin then its torque is

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Maximum

Zero

Negative

Non-zero

The phenomenon of radioactivity is associated with:

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Fission of nucleus

Disintegration of neutrons

Emission of spectral lines

Spontaneous disintegration of the nuclei of atoms

At what point/points in its path does a projectile have its maximum speed ?

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At the point of projection

At the point where its strikes the ground

Both

None of these

Charge to mass ratio (e/m) of a charge particle is also called its:

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Specific charge

Specific Force

Gyro-magnetic ratio

Magneto-mechanical ratio

Semiconductor materials have the conductivities generally lies between

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10^-5 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10^-7 to 10^-3 (Ωm)^-1

None of these

High temperature water with pressure, come to the surface as

Choose an answer

Hot springs

Geysers

Steam vents

All of these

The two electric charges originally 8 cm apart are brought closer together, until they are 2 cm apart the force between them is now greater by a factor

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2

4

8

16

The ability of body to return to its original shape is called

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Elasticity

Stress

Strain

Shear

On heating, glass gradually softens into a paste-like state before it becomes a very viscous liquid at almost

Choose an answer

600°C

7600°C

800°C

900°C

To decrease timing uncertainly

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Increase number of vibration

Decrease number of vibration

Increase length of pendulum

Decrease length of pendulum

For all the irreversible processes the entropy of the system

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Increases

Decreases

Remains constant

None of these

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

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Frequency

Phase

Wavelength

All of these

A cell of negligible resistance and e.m.f 2 V is connected across a series combination of 2,3 and 5 ohms. The p.d. across the 3 Ω resistor is

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0.6 V

1/3 V

2/3 V

4/3 V

If plane polarized light is incident on the second sheet of Polaroid, the light emitted is full light when their axes are

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Parallel to each other

Perpendicular to each other

In between two positions

None of these

The drag force increases as the speed of the object

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Decreases

Increases

Remains constant

None of these

The SI units of torque is

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Nm²

Nm

Nm^-1

Nm^-2

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

When the radioactive nucleus emits a beta particle, the proton neutron ration:

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increases by one

Remains same

Decreases by one

Decreases by four

A boat of mass 40 kg os at rest.A dog of mass 4 kg moves in the boat with a velocity of 10 m/s.What is the velocity of boat?

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4 m/s

2 m/s

8 m/s

1 m/s

Correction factor can be applied to

Choose an answer

Personal error

Systematic error

Random error

All

The low blood pressure is known as

Choose an answer

Diastolic

Systolic

Low blood pressure

None of these

The study of properties of fluid at rest is called

Choose an answer

Fluid dynamic

Fluid statics

Both a and b

dynamics

If resultant of two forces (F and F) acting on a point is F,then the angle between two forces is.

Choose an answer

0°

45°

60°

120°

The acceleration of a body at some particular instant is called

Choose an answer

Initial acceleration

Variable acceleration

Instantaneous acceleration

None of these

If the earth were to rotate faster than its present speed the weight of an object will

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Increase at the equator but remain unchanged at the poles

Decreases at the equator but remain unchanged at the poles

Remain unchanged at the decrease but decrease at the poles

A heat engine converts thermal energy to mechanical work which is

Choose an answer

All

Partly

Some

None of these

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

If the unit of force and length are increased by four times then the unit of energy is increased by

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2 times

4 times

8 times

16 times

Indicate which pair of physical quantities given below has not the same units and dimensions?

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Momentum and impulse

Torque and angular momentum

Acceleration and gravitational field strength

Pressure and modulus of elasticity

For the same kinetic energy,the momentum is maximum for:

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An electron

A proton

A deuteron

An a particle

The velocity of rain drop attains constant value because of

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Surface tension

Upthrust of air

Viscous force exerted by air

Air currents

In an interference pattern of Ypung's double Slit (YDS) experiment:

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equal width

Central fringes are wider than the outer fringes

Viscosity of gases with increase in temperature

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Increase

Decrease

Remains same

None

Absolute potential at infinity is

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Maximum

Minimum

Zero

None of these

Which of the following correctly states the base units of weight?

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N

N m s^-2

Kg m s^-1

Kg m s^-2

A result of the Bernoulli's equation is that the pressure will be low where the speed of the fluid is

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Low

High

Very high

None of these

Choose an answer

Initial velocity

Variable velocity

Instantaneous velocity

None of these

The magnitude of torque determines its

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Linear acceleration

Angular acceleration

Moment arm

None of these

If both the length and radius of the wire are doubled,how does the modulus of elasticity change?

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Becomes one fourth

Halved

Doubled

Remains unchanged

A photo cell is based on:

Choose an answer

Compton effect

Pair production

Photo cell

All of these

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

Strain is defined in terms of:

Choose an answer

Formation

Deformation

Area

Newtons

None of these

The technological uses of superconductors are

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MRI

Magnetic levitation trains

Faster computer chips

All of them

For a circular orbit, the satellite has speed of

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20,000 kmh^-1

25,000 kmh^-1

26,000 kmh^-1

27,000 kmh^-1

The number 1678.9 should be written in scientific notation as

Choose an answer

16.789 × 10³

1.6789 × 10³

1678.9 × 10³

None of these

If A x B = B x A,then the angle between A and B is

Choose an answer

π

π/3

π/2

π/4

Fluid friction of a spherical body depend on the

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Shape

Size

Orientation

All of these

We can observe only when the grating spacing is

Choose an answer

of the order of the wavelength used

greater than the wavelength used

less than the wavelength used

any one of them

Length of a metal cylinder with the help of a vernier callipers of least count 0.01 cm is 5.35 cm. Its percentage uncertainty in length is

Choose an answer

2%

2.3%

0.2%

0.3 %

The percentage uncertainties are when current I is following 0.84 ± 0.05 A due to potential difference 5.2 ± 0.1 V. The uncertainty of R is

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7.72 ± 0.5 ohm

6.62 ± 0.5 ohm

6.6 ± 0.5 ohm

None of these

Young's modulus for glass is

Choose an answer

15

35

39

55

Why the toner is given a negative charge to the drum

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To spread over the drum

To stick the writing

To neutralize writing

None of these

__________ is a cubic pattern having one extra atom or molecule at the centre of each of the six faces of the cube

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Simple cube

Face centered cube

Body centered cube

None of these

High energy physics is the physics of

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Nucleus

Subatomic particles

Plasma physics

Astrophysics

How many types of strain is

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1

2

3

4

From the following pairs,choose the pair that does not have identical dimensions

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Angular momentum and Planck's constant

Moment of inertia and Moment of force

Work and Torque

Impulse and Momentum

Above the curie temperature, iron becomes

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ferromagnetic

paramagnetic

diamagnetic

any one of them

The volume of liquid flowing per second out of an orifice at the bottom of a tank does not depend upon

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The area of the orifice

The height of liquid above the orifice

The density of liquid

Both A and C

For which color of light the refractive index of glass is larger

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Red

Green

Blue

Violet

Pressure exerted by a gas on the walls of its container is due to

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Adhesion between the gas molecules and the container

Cohesion between the gas molecules and the container

Collision between the gas molecules and the container

Surface tension of the gas

The direction of the acceleration is the same as that of

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Displacement

Velocity

Both

None of these

When a meteorite enters into earth atmosphere its energy converts into

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Kinetic energy

Heat energy

Mechanical energy

None of these

The rate at a which the angular displacement is changing with time is called

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Angular acceleration

Angular velocity

Average angular velocity

None of these

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

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Work

Spring constant

Torque

Both A and C