Question # 1

Second's pendulum is the pendulum whose time period is:

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1 second

2 second

3 second

None of these

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

Heat required to raise the temperature of one mole of a gas through 1 K at constant pressure is called

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heat capacity

specific heat capacity

specific heat at constant volume

specific heat at constant pressure

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is:

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1.25 J

12.5 J

125 J

None of these

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

In an elevator moving vertically up with an acceleration 'g' the force exerted on the floor by a passenger of mass M is

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Mg

1/2 Mg

Zero

2 Mg

Heating effect caused by an electric circuit is written

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H = I²Rt

H = I²R

H = IR²t

H = IR²

For a body executing S. H. M, its

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momentum remains constant

potential energy remains constant

kinetic energy remains constant

total energy remains constant

The internal energy of a system does not depend upon the

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initial state of the system

final state of the system

path

none of them

The charge carriers in an electrolyte are

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Positive ions

Negative ions

Either A or B

Both A and B

Neither A nor B

A force of 10N is required to move a body with a velocity 10 ms^-1the power developed is

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10 W

50 W

100 W

1000 W

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

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

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

Which of the following is not a perfectly inelastic collision?

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Striking of two glass balls

A bullet striking a bag of sand

An electron captured by a proton

A man jumping onto a moving cart

A circular disc rolls down an inclined plane without slipping. What is its rotational kinetic energy

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1/2 MR²ω

1/4 MR²ω²

1/2 M²R²ω²

3/4 M²R²ω²

If the direction of the applied force is reversed then

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Its torque remain unchanged

The magnitude of its torque changes and direction of the torque remains the same

The magnitude of its torque remains the same but the direction of the torque reverses

Torque is also reversed

Crystal lattice is a repetition of

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Atoms

Molecules

Unit cell

All of them

For interference to occur,the interfering beams of light must be

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Of different frequencies

Coherent

White light

Added

When a germanium atom is doped with phosphorous atoms it becomes

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N-type semiconductor

p-type semiconductor

An insulator

None of them

For a incompressible fluid its

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Density is constant

No internal friction is present

Velocity is constant

All of these

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