Question # 1

The phase difference between two points on a wave front will be

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0°

4π

2π

π/2

The colour of light is determined by is

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Wavelength

Frequency

Velocity

Amplitude

1 torr = --------------------

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1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

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

Hotness or coldness of an object is expressed in terms of a quantity called

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Heat

Temperature

Kelvin

None of these

A 10 kg car is turning around a corner at 10 ms^-1. The radius of the circular arc is 10 m. Find the force between the types and pavement which is

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1.0 × 10⁶ N

1.0 × 10⁴ N

1.0 × 10² N

None of these

In which situation does diffraction occur?

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a wave bounces back from a surface

a wave meets another wave to produce a new wave

a wave passes from one medium into another

a wave passes through an aperture

A positive charge is moved from a low potential point (A) to a high potential point (B) Then the electric potential energy

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Increases

Decreases

Will remain the same

Nothing definite can be predicted

In normal adjustment, the length of the telescope is

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f_e + f_o

f_o - f_e

f_e - f_o

None of these

Critical angle of light passing from glass to air is minimum for

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Red

Green

Yellow

Violet

The cause of mirage observed in deserts in bright sunlight is due to:

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Refraction of light

Reflection of light

Scattering of light

Total internal reflection of light

A sonometer wire 100 cm in length has a fundamental frequency of 330 Hz. Thevelocity of propagation of waves along the wire is

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115m/sec

660m/sec

990m/sec

In semiconductors, the valence band at room temperature is

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Completely filled

Partially filled

Empty

None of these

A particular wavelength received from a galaxy is measured on earth and isfound to be 5% more than that its wave length on earth. Hence galaxy is

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Moving towards earth

Going away from earth

Stationary with respect to earth

None

At every degree Celsius rise of temperature, the volume of a given mass of a gas at constant pressure increases by

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1/273 of its value at 0°C

1/373 of its value at 0°C

1/173 of its value of 0°C

1/700 of its value at 0°C

Two sources of light are said to be coherent when the waves produced by them have

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Equal wavelength

Equal amplitude

Equal wavelength and constant phase difference

Amplitude and wavelength are same

A polarizer is used to

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Reduced intensity of light

Produce polarized light

Increase intensity of light

Produce unpolarised light

The pair of quantities has same dimensions?

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Power, Work

Work, Torque

Impulse, Linear momentum

Both B and C

Viscosity of acetone at 30^oC in NSm^-2

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0.198 × 10^-3

0.224 × 10^-3

0.295 × 10^-3

0.301 × 10^-3

If the stress increased on a material is beyond the yield strength of the material is called

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Plasticity

Elasticity

Still in elasticity

None of these

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

The efficiency of full wave rectifier is:

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25.6%

81.2%

81.6%

71.2%

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 cross product of parallel vectors is zero when angle between

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θ 0^o

θ = 90^o

θ = 180^o

a and c

The lower refractive index the fibre core has

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1.48

1.40

1.54

1.42

Vector A lies in XY plane. For what orientation with both of its rectangular components be negative ?

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I-quadrant

II-quadrant

III-quadrant

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

In superconductors, the resistance of a material drops to zero and no

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Power is dissipated

Energy is dissipated

Current is dissipated

None of these

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

The activity of a radioactive sample is 1.6 curie and half-life is 2.5 days. Its activity after 10 days will be:

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0.8 Curie

0.1Curie

0.4 Curie

0.16 Curie

Newtons second law gives the measures of

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Acceleration

Force

Momentum

Angular momentum

The methods used for the conversion of biomass into fuels are

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Fermentation

Direct combustion

Direct sunlight

a & b

The unit cell of the shape of match box is called

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Cubic

Tetragonal

Orthorhombic

Rhomboheral

Which of the following have same SI units

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Force

Impulse

Momentum

B and C

The centre of gravity of a body of an irregular shape lies

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At its centre

inside the surface

At the intersection of medians

All of these

Mathematically, the instantaneous acceleration is represented by

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Two equal forces (P each) act at a point inclined to each other at an angle of 120°.The magnitude of their resultant is

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P/2

P/4

P

2P

The light from the sun reaches to earth with wavefronts

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Spherical

Cylindrical

Plane

None of these

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

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential decreases with increasing distance from the centre

The electric potential is zero

The electric field is perpendicular to the line joining the charges

A circuit that converts Pulsating DC into smooth DC contain :

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Filter

Capacitor

Inductor

LC circuit

Age of the Earth is

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14 × 10¹⁷ sec

1.4 × 10¹⁹ sec

1.4 × 10¹⁷ sec

1.4 × 10¹⁵ sec

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

The curie temperature for iron is

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750°C

570°C

750°k

57°K

The cause of power loss in optic fibre is

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Absorption

Scattering

Dispersion

All

If the error in the measurement of radius of a sphere is 1% then the error in the measurement of volume will be

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1.1%

3%

5%

8%

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19 electrons

6.25 x 10¹⁸ electrons

6.25 x 10²¹ electrons

The moment of inertia of a body does not depend upon its

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Angular velocity

Mass

Distribution of mass

Axis of rotation

A longitudinal sinusoidal wave has wavelength of 1cm and a period of 2sec. Its wavevelocity is:

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50 cm/ sec

0.5 cm/ sec

5 m/ s

0.005 m/ sec

The ability of body to return to its original shape (after the force is removed) is called:

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Elasticity

Ductility

Stress

Strain

Any of these

For the measurement of temperature of the order of 400°C, we will prefer

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Hg thermometer

Alcohol thermometer

Pyrometer

Thermometer

A car covers 1/3 distance with speed 20 km/hr and 2/3 with 60 km/h.Average speed is

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40 km/h

50 √2 km/h

36 km/h

80 km/h

The energy need to magnetize and demagnetize the specimen during the each cycle of magnetizing current is

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Value of current

Value of demagnetizing current

Value of magnetic flux density

Area of the loop

Substances which undergo plastic deformation until they break, are known as

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brittle substances

ductile substances

plastic substances

neither of them

The light source used in multimode step index fibre is

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A monochromatic source

Red light

White light

None of these

The pressure exerted on the walls on the vessel by gas molecules is defined as:

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Force per unit volume

Energy per unit area

mass per unit volume

None of these

Dimension of coefficient of viscosity is

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[MLT¹]

[L^-1T^1]

[ML^-1T^1]

[M^-1L^-1T^1]

The dimensions of work are

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[MLT^-2]

[ML²T^-1]

[ML²T²]

[ML²T^-2]

A diffraction grating of length 2cm has 4000 lines The grating element is

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0.5 x 10^-2 cm

5 x 10⁴

5 x 10^-4

0.5 x 10^-4 cm

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

One cannot see through fog becuase

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

For the same value of resistors the output of non-inverting amplifier compared to the output of inverting amplifier is, (ignoring phase difference)

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Greater

Equal

Smaller

Undefined

At terminal velocity the net force acting on it is

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Maximum

Minimum

Zero

None of these

A component of a vector has its

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Normal value

Effective value

Given direction

b and c

When the second condition for equilibrium, is satisfied then there is no

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Linear acceleration

Angular acceleration

Both

None of these

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

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Free electron theory

Band theory

Theory based as chemical properties

None of these

Metals are good conductors of electricity and their conductivities are of the order of

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10³(Ω m)^-1

10⁴(Ω m)^-1

10⁶(Ω m)^-1

10⁷(Ω m)^-1

The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

A metal ball hangs from a spring balance which is placed on the wall of an elevator under freefall. Why does the spring balance show a weight of o(zero)N?

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because the ball is in free fall

because the spring balance is in free fall

both a and b

because the spring balance exerts no force on the ball

Mercury thermometer can be used to measure temperature up to

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260°C

100°C

360°C

450°C

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 original source of Wind energy is

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Tides

Waves

Sun

Moon

The relative permitivity ∈_r for teflon is

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2.1

2.4

2.9

3.0

Which of the following is not crystalline solid

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Zinc

Copper

Sodium chloride

None of these

The escape velocity of moon in Kms^-1 is

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1.23

2.43

2.40

2.59

A prism splits a beam of white light into seven component colors. This is so because

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Phase of different colors is different

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors is different

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

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An electron

A proton

A deuteron

An a particle

The escape velocity of Neptune in Kms^-1

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20.26

24.03

25.4

25.6

Polaroid glass is used in sun glasses because

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It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

The value of Faraday number is SI unit is

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9.65 Coulomb/kg/equivalent

9.65 x 10⁷Coulomb/kg/equivalent

9.65 x 10^-7Coulomb/kg/equivalent

9.65 Coulomb/kg/equivalent

Sun has elliptical shape when it rises and sets due to

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Refraction

Reflection

Scattering

Dispersion

When the first condition of equilibrium is satisfied the body will be in

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complete equilibrium

translational equilibrium

rotational equilibrium

all of them

For the conversion of heat into work, the two bodies are essential as temperature which is

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Similar

Very little difference

Large difference

None of these

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

If S is the stress and Y is Young's modulus of the material of a wire, the energy stored in the wire per unit volume is

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2 S²Y

S²/2Y

2Y/S²

S/2Y

Two masses m₁ and m₂ have equal momentum their kinetic energies are in ratio of

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m₂: m₁

m²1 : m₂²

m₁: m₂

m₂^{2 :}m²1

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

The setting of Newton's rings is

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A Plano convex lens and the plane glass plate

A Plano convex lens and simple glass sheet

A Plano convex lens (long focal length) and the plane of glass plate

None of these

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

Motion of rocket is based upon

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Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

First law of thermodynamic is generalization

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Law of conservation of mass

Law of conservation of energy

Law of heat exchange

None of these

The value of young modulus in Nm^-2for water is

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70 x 10

2.2 x 10⁵

Zero

None of these

Michelesion's interferometer is an instrument usually used to measure

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intensity of light

speed of light

wavelength of light

dispersion of light

The minimum number of lenses used in compound microscope is

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1

2

3

4

Swimming is possible on account of

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First law of motion

Second law of motion

Third law of motion

Newtons law of gravitation

The decrease in potential energy of a ball of mass 20 kg which falls from a height 50 cm is:

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968 J

98 J

1980 J

None of these

Examples of brittle substances are

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Glass

Copper

Lead

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

Elastic deformation of a material is the deformation which is

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Permanent

Temporary

Some what permanent

None of these

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

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

Debye is the unit of

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Magnetic dipole moment

Electric dipole moment

Density

RMS velocity

Torque is defined as:

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Time rate of change of angular momentum

Time rate of change of linear momentum

Time rat of change of angular veloctiy

All of these

Sky seems blue due to

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Diffraction

Polarization

Dispersion

Scattering

The critical temperature Tc for Aluminium is

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2.1 K

1.1 K

1.18 K

1.19 K

The fiber of which refractive index ______ gradually as move from central core to its periphery is called ______ index fiber

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Decreases, multi-mode graded

Increases, single mode step

Either of A or B

Increases, multi-mode step

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

A voltage of 600V can be obtained virtually from

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Dry battery

Nickel cadmium battery

Head and tail of cell

Transformer

The conduction band in a solid

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may be empty

cannot be empty

should be filled

all of them

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

Tick which of the following is not state variable:

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Heat energy

Pressure

Entropy

Volume

Unit of solid angle is

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Radian

Degree

Steradian

Revolution

Which of the following phenomenon is not application of Bernoulli s equation

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Swing in cricket ball

Flying of airplane

Working of carbonator

Beats

A ballistic missile is

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Unpowered

Unguided

Both

None of these

If an electron vertically downwards, then the horizontal component of the earth’s magnetic field will deflect it to wards

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West

East

North

The direction of angular displacement is determined by using

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Heat-to-tail rule

Fleming left hand rule

Right angle rule

None of these

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

Number of supplementary units are

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three

two

seven

five

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

Three quarks make up a:

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Leptons

Mesons

Baryons

Quark

Which one of the material is not polymer

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Glass

Natural rubber

Polyethene

Polystyrene

The maximum and minimum magnitudes of the resultant of two given vectors are 17 units and 7 units respectively.If these two vectors are at right angles to each other.the magnitude of their resultant is

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14

16

18

13

The value of g on the moon whose diameter is 1/4 that of earth is 1/6 of that of earth.The ratio of escape velocities at moon and earth's surface is nearly:

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1 : 5

1 : 1

2 : 5

5 : 1

Work is defined as the dot product force and displacement which is a

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Scalar quantity

Vector quantity

Constant quantity

None of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton.If the work done is 25 joules. the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

According to Bernoulli s theorem velocity and pressure

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Are directly proportional

Are inversely proportional

Have no relation

Are equal

Microwaves are used because they travel in a

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Narrow beam

Straight line

Easily pass through Earth atmosphere

All of these

A plane wavefront is that which has source

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Nearest

Distant

Near

None of these

The moment of linear momentum of a body is called

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Angular momentum

Couple

Impulse

Torque

The image formed by an eyepiece of compound microscope is

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Real and diminished

Real and enlarged

Virtual and enlarged

Virtual and diminished

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max Planck

Albert Einstein

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

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

Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

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Increasing gradually

Decreasing gradually

It is constant at the centre

None of these

The time of flight of a projectile motion equals to

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half of the time to reach maximum height

twice the time to reach maximum height

one fourth of time to reach maximum height

time to reach maximum height

A car engine is based on the principle of

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Bernoulli's equation

Verturi relation

Torricelli;s theorem

None of these

The typical speed of has working aunt is

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0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

Which of the material is brittle ?

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Steel

Low carbon steel

High carbon steel

None of these

The ratio of SI units to CGS units of gravitational constant G will be

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10^-3

10

10²

10³

Acceleration is a physical quantity which is

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Scalar quantity

Vector quantity

Constant quantity

None of these

We can use Fibre optics system for

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Image transmitting

Word processing

Image processing and recelving

All

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

Choose an answer

Decreases

Increases

No change

May increase or decrease

Two bodies A and B each of mass 2 kg moving towards right collide with each other elastically,after collision

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A stops and velocity of B increases

Velocity of both decreases

Both moves with the same velocity

Both interchange their velocities

Newtons laws were published in

Choose an answer

1587

1687

1787

1678

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?

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2.0 mm

1.0 mm

4.0 mm

0.5 mm

Avogadro number is known as number of molecules in:

Choose an answer

One kg of a substance

Unit volume of a substance

One mole of a substance

None of these

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

Which of the following quantities is a vector

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Volume

Temperature

Displacement

Density

The energy equivalent to the mass of one Kilogram is

Choose an answer

3 x 10⁸j

931 Mev

9 x 10¹⁶m

25 Mev

Wave length of red colour as compared to that of violet colour is:

Choose an answer

Smaller

Longer

Equal

None of these

The shape of crystals other than a cube have

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Right angles

Not right angles

Not corners

None of these

Selenium is an insulating material when exposed to

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Light

Dark

Monochromatic light

None of these

A wire is stretched by applying a stretching force.If the stretching force is doubled within elastic limit Then energy stored in the wire will

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Be double

Increase by four times

Increase by eight time

Remain same

The torque acting upon a system is zero Which of the following will be conserved

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Linear momentum

Angular momentum

Moment of inertia

Angular velocity

The contrast in the fringes in any interference pattern depends on

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Frings width

Intensity ratio of the sources

Distance between the slits

Wavelength

The process of liquefaction and evaporation of a substance performed slowly are

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Reversible

Practically reversible

Not reversible

None of these

In full wave rectification by bridge the number of diodes required are

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3

4

2

5

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

Shear modulus for diamond is

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156

353

450

477

Monochromatic light directly means waves of

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Same frequency

Same color

Same wavelength

All of them

The acceleration of the rocket is

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a = MV/m

a = mM/V

a = mM/2V

a = mV/M

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

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6.66 j

15 j

22.5 j

45 j

In petrol engine, the third stroke is the

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Intake

Power

Exhaust

None of these

Time of flight of a body in projectile is the time in which a body

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Remains in the air

It reaches maximum height

The velocity becomes zero

None of these

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

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4 m/s

1 m/s

2 m/s

None of these

When a dielectric is inserted between the plates of the capacitor (Charged).The energy stored by capacitor (assume battery is disconnected)

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Increases

Decreases

Remains constant

First decreases then increases

Which one is a vector quantity?

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Work

Density

Momentum

Pressure

The shearing strain is measured by

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Angle of rotation

Shearing stress

Angle of shear

Modulus of rigidity

A constant volume gas thermometer works on

Choose an answer

Charles' law

Boyle's law

Pascal's law

None of these

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

Physical quantities having no dimensions are called

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Scalar

Numerics

Non physical Quantities

None of these

A fly is sitting on the objective of a telescope pointed towards the moons what effect is impacted in a photograph of the moon taken through the telescope

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The entire field of vision is blocked

There is image of the fly on the photograph

There is no effect at all

There is the reduction in intensity of the image

A typical diffraction grating has lines per centimeter

Choose an answer

10 to 100

100 to 1000

1000 to 5000

400 to 5000

The magnifying power of a simple microscope can be increased if we use eye piece of

Choose an answer

Higher focal length

Smaller focal length

Higher diameter

Smaller diameter

A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called

Choose an answer

Step index fibre

Multimode step index fibre

Multimode graded index

None of these

The unit of power is

Choose an answer

Erg

KW

Watt

both B and C

A force of 0.01 N is exerted on a charge 1.2 x 10^-5C at a certain point The electric field at that point is

Choose an answer

1.2 x 10⁴N/C

8.3 x 10²N/C

8.3 x 10^-2N/C

In case of constructive interference of two waves, the amplitude of the resultant wave is_____either of the waves:

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Greater than

Equal to

Smaller than

None of these

In light waves, the components of electric and magnetic fields are

Choose an answer

parallel to each other

anti-parallel to each

right angle to each other

none of them

The centre of gravity of an object is

Choose an answer

The force of gravity on the object

The point about which the object rotates

The point at which the total weight of the object act

none of these

The SI units of flow rate are

Choose an answer

m²s^-1

m³s^-2

m³s^-1

m²s^-2

Shear modulus for aluminium is

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30

70

80

90

The viscous force on a small sphere moving in fluid at high speed v is proportional to

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v²

v

1/v

1/v²

Multiplication of a vector is carried out by a

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Number

Direction

Number and direction

None of these

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h.The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

We can achieve polarization by

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Absorption

Reflection

Scttering

All of above

When a shell explodes a mid-air, the total momentum of its fragments is

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less than the momentum of shell

equal to the momentum of shell

greater than the momentum of shell

none of them

A PN junction diode cannot be use:

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As rectifier

For converting light energy to electrical energy

For getting light radiation

For increasing the amplitude of an ac signal

To get three images of a single object,one should have two plane mirrors at an angle of

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90°

120°

30°

160°

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

Two bodies of 4 g and 16 g have same kinetic energy.What is the ratio of their momenta?

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1 : 4

1 : 2

2 : 1

4 : 1

The temperature below which materials are superconductor is called as:

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Kelvin temperature

Critical temperature

Curie temperature

none of these

In the measurement 12.7 measures

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One accurately known digit

Tow accurately known digit

Two accurately known digit and one doubtfull

None of these

A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:

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25 Hz

50 Hz

12.5 Hz

5Hz

Drag force on a falling ball depends upon

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Size of the body

Shape of the body

Orientation of the body

All of these

The dimensional formula for latent heat is:

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M^°L²T¹

ML²T^-2

MLT^-2

ML²T^-1

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 displacement time graph for the two particles A and B are straight lines inclined at 60° and 30° with the same axis.The ratio of the velocity of B is

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1:1

2:1

3:1

4:1