Question # 1

A piece of fuse wire melts when a current of 15 ampere flows through it.

With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10 ohm

1 ohm

0.10 ohm

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

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

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

The essential distinction between X-rays andγ-rays is that

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γ-rays have smaller wavelength than X-rays

γ-rays emanate from nucleus while X-rays emanate from outer part of the atom

γ-rays have greater ionizing power than X-rays

γ-rays are more penetrating than X-rays

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

oscillator

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

The mass of a proton is 1847 times that of an electron. An electron and a proton are projected into a uniform electric field in a direction at right angles to the direction of the field with the same initial kinetic energy.The

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Both the trajectories will be equally curved

The proton trajectory will be less curved than the electron trajectory

The electron trajectory will be less curved than the proton trajectory

The relative curving of the trajectories will be dependent on the value of the initial kinetic energy

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Mechanical waves on the surfaces of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

A person standing on a rotating platform has his hands lowered. He suddenly outstretches his arms. The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

Which of the following lists of physical quantities consists only of vectors:

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Time, temperature, velocity

Force, volume, momentum

Velocity, acceleration, mass

Force, acceleration, velocity

When the length of a microscope tube increase, its magnifying power

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Decreases

Increases

Does not Change

May increase or decrease depending on the observer and the place of observation

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

A ten-ohm electric heater operates on a 110 V line. Calculate the rate at which it develops heat in watts:

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1310 W

670 W

810 W

1210 W

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