Question # 1

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

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

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

Two point charges placed at distance of 20 cm in air repel each other with a certain force.When a dielectric slab of thickness 8 cm and dielectric constant K is introduced between these point charges force of interaction becomes half of its previous value Then K is approximately.

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2

4

√2

1

A particle moving in a magnetic field has increase in its velocity then its radius of the circle

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Decreases

Increases

Remains the same

Becomes half

Two bodies with masses M_A and M_B are moving with equal kinetic energy.Their linear moments are numerically in a ratio | P_A| : |P_B| will be:

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M_B: M_A

M_A: M_B

√M_A : √M_B

M_A²: M_B²

Ultra-violet radiation of 6.2 eV falls on an aluminium surface K.E of fastest electrons emitted is(work function = 4.2 eV)

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3.2 x 10-21 J

3.2 x 10-19 J

7 x 10-25 J

9 x 10-32 J

With the propagation of a longitudinal wave through a material medium the quantities transmitted in the propagation direction are

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Energy momentum and mass

Energy

Energy and mass

Energy and linear momentum

If the amplitude of sound is doubled and the frequency reduced to one-fourth the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

A particle moves along a circular path under the action of a force. The work done by the force is

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Zero

Positive and non-zero

Negative and non zero

None of above

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