Question # 1

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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1 : 2

2 : 3

3 : 4

8 : 9

One radian is equal to:

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30.3°

45.3°

50.3°

57.3°

Cause of heat production in a current carrying conductor is

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Collisions of free electrons with one another

High drift speed of free electrons

Collisions of free electrons with atoms or ions of conductor

High resistance value

The current produced by moving a loop of wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:

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Zero

Of smaller magnitude

Of larger magnitude

Sometimes B, sometimes C

Neither of these

The dimensions of viscosity are:

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M²L^-1T^-2

M^-1L¹T^-1

M^-1L^-1T

ML^-1T^-1

When a conductoris moved across a magnetic field:

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Emf induced its similar to that of a battery

Emf induced gives rise to induced current

An emf is induced across its ends

All are correct

None of these

A charged particle moving at right angle to the magnetic field will experience

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minimum force

maximum force

zero

moderate force

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

Lens's law deals with the

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Magnitude of induced current

Magnitude of induced e.m.f

Direction of induced e.m.f

Direction of induced current

The speed of swimming of porpoise is

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5 ms^-1

6 ms^-1

8 ms^-1

9 ms^-1

The minimum number of lenses used in compound microscope is

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1

2

3

4

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h.His average speed will be.

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40 km/h

48 km/h

50 km/h

60 km/h

An oil film floating on water surface show colours due to

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Interference

Diffraction

Scattering

Reflection

Two wires of same material have lengths L and 2L and cross-sectional area 4A and A respectively. the ratio of their specific resistance would be:

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1: 1

1: 8

8: 1

1: 2

A man pushes a wall but falls to displace it.He does:

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Negative work

Maximum positive work

Positive work but not maximum

No work

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

Beta particles have less ionizing power than that of alpha particles because:

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Their smaller energy

Their smaller mass

Their smaller density

Their smaller charge

For an adiabatic expansion of a gas which of the following statement is false?

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Pressure of gas decreases

No heat is supplied to the gas

Work is done by gas

Entropy of gas is increased

SI Unit of power is

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Joule

Pound

Watt

Dyne

Everything in the vastness of space is in a state of

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Rest

Motion

Perpetual motion

None of these

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