Question # 1

Direction of motion_______ in circular of motion:

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Changes off and on

Changes continuously

Does not change

None of them

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

The angle of deflection of coil can be measured by the

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one method

three method

two method

none of these

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

Particles have the mass smallest of following is

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Electron

Proton

Neutron

Quark

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

In free space, the speed of electromagnetic waves is

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3 x 10⁸ms^-1

3 x 10⁶ms^-1

4 x 10⁷ms^-1

3 x 10⁹ms^-1

To sources are said to be coherent if they have:

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Same amplitude

Same wavelength

Definite phase relation with each other

None of them

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

The area under line velocity-time graph is numerically equal to the

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speed of the body

acceleration of the body

distance covered by the body

none of them

For constructive interference path difference should be

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Integral multiple of λ/2

Integral multiple of λ

Odd integral multiple of λ

Odd integral multiple of λ/2

Colour of thin film will not show result from

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Scattering of light

Dispersion of light

Interference of light

Both a and b

If the temperature of the sink is decreased, the efficiency of a Carnot engine

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Decreases

Increases

Remains constant

First increases the decreases

A ball of mass m₁ and another ball of mass m₂ are dropped from equal heights.If time taken by the balls are t₁ and t₂ respectively then

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t₁ = t₂/2

t₁ = t₂

t₁ = 4t₂

t₁ = t₂/4

Inertial frame of references are those frame of references which are moving with

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increasing velocity

decreasing velocity

constant velocity

all of them

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

When a body is moving with uniform positive acceleration, the velocity-time,then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

Which is having minimum wavelength?

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X-rays

Ultra-violet rays

Y-rays

Cosmic rays

Which of the following is dimensionally correct

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Pressure = energy per unit area

Pressure = energy per unit volume

Pressure = force per unit volume

Pressure = Momentum per unit volume per unit time

A lens behaves as a converging lens in air and a diverging lens in water the refractive index of the material is

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Equal to unity

Equal to 1.33

Between unity and 1.33

Greater than 1.33

When m₁= m₂, the velocities of both bodies become

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V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

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