Question # 1

The instrument used to study the properties of waves is called:

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Ripple tank

Stroboscope

Pendulum

None of these

Which form of energy is sound?

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Electrical

Mechanical

Thermal

Chemical

Electric field lines:

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always cross each other

never cross each other

cross each other inthe region of strong field

cross each other in the region of weak field

When a uranium (92 protons) ejects a beta particle, how many protons are left in the remaining nucleus?

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92 protons

91 protons

93 protons

89 protons

In SI the unit of charge is:

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Joule

Volt

Coulomb

Watt

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

The technique or method used to absorb undesirable sounds by soft and porous surface is called:

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Ultrasonic

Acoustic protection

Infrasonics

Echo

Battery converts chemical energy into which energy:

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Mechanical

Electrical

Thermal

None of these

The disturbance travelling in a medium is called:

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Wave motion

Simple harmonic motion

Motion

both a ,b

Totally reflecting prism turns the incident ray at an angle of:

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90^o

60^o

75^o

45^o

Optical fibre are:

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Cheap

Flexible

Lighter

All of these

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

If the distance between two point charges is reduced to half, the coulomb’s force become:

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Half

Two times

One fourth

Fourth times

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