Question # 1

Band spectrum is produced by

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H

He

H₂

Na

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

According to the Hooke's law the force required to change the length of a wire by 'I' is proportional to

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I^-2

I^-1

I

I²

A body moving in circular motion with constant speed has

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Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

Angular momentum is

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Vector (axial)

Vector (polar)

Scalar

None of these

At constant volume temperature is increased. Then

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Collision on walls will be less

Number of collisions per unit time will increase

Collisions will be in straight lines

Collisions will not change

The contrast in the fringes in any interference pattern depends on

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Fringe width

Intensity ratio of the sources

Distance between the slits

Wavelength

In Which case does the potential energy decreases?

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On compressing a spring

On stretching a spring

One moving a body against gravitational force

One the rising of an air bubble in water

A moving charge will gain energy due to the application of

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Electric field

Magnetic field

Both of these

None of these

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

Copper and germanium are cooled to 70K from room temperature, then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

Two sources of sound are said to be coherent if

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They produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase different all instant of time

Which one of the following phenomena is not explained by Hugen's construction of wavefront?

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Refraction

Reflection

Diffraction

Origin of sepectra

A wire is stretched to double of its length. The strain is

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2

1

zero

0.5

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

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Kinetic energy

Potential energy

Vibrational energy

Density

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

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