Question # 1

The waves in which the particles of the medium are displaced in a direction perpendicular to the direction of propagation of waves are known as

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longitudinal waves

transverse waves

non-mechanical waves

none of them

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

Which one of the least multiple:

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Pico

Femto

Nano

Atto

The wave motion set up in any medium depends upon:

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Elasticity

Inertia

Density

All of these

Avo-meter is used of measure the

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current, voltage

voltage, resistance

resistance, current

current, voltage and resistance

One mole of any substance contain

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same number of molecules

different number of molecules

may be same or different

none of them

When angular acceleration is positive, the body rotates:

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Slower

Slowest

Faster

None of these

Two sources of sound are said to be coherent if

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The 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 difference all instant of time

Current is measured in

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volts

watt

ohm

ampere

Average KE of a gas molecule has:

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Direct relation with absolute temperature and inverse relation with pressure

Direction relation with both absolute temperature and pressure

Inverse relation with both absolute temperature and pressure

None of these

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

As the working substance of a heat engine completes a cycle, there is no change in:

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Internal energy

Pressure

Volume

All of these

If the angle of refraction is 90^o, for which the angle of incidence is called

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Incident angle

Critical angle

Angle of emergence

None of these

Kilowatt-hour is a unit of

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Power

Energy

Electrical Energy

None of these

Inspite of different dispersion, all the wavelengths arrive at the other end of the fibre at the same time. With a step-index fibre overall time difference may be about

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40 ns

30 ns

32 ns

33 ns

Electrons of an isolated atom are bound to the nucleus, and?

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy

none of them

In deformation of the material, the potential energy of the molecules due to displacement from their mean positions is

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Lost

Gained

No lost no gain

None of these

Internal friction of a fluid is called

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Surface tension

Resistance

Viscosity

None of these

When the source of light is at very large distance, the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

Moment of inertia of a sphere is

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1/3 mr²

3/4 mr²

4/5 mr²

2/5 mr²

Bulk modulus for lead is

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2.9

7.7

9.3

15.6

Equal charges are given to two spheres of different radii The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both sphere

Depend on the nature of material of sphere

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