Question # 1

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

the distance between two consecutive trough or crest is called:

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wavelength

frequency

time period

amplitude

The speed of sound in air at 21 °C is:

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will:

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Be increased by a factor of 2

Remain the same

Be decreased by a factor of 2

Be decreased by factor of 4

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

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Ripple tank

Stroboscope

Pendulum

None of these

Total energy supplied in driving one coulomb of charge around a complete circuit is called:

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Potential

Potential difference

Electromotive force

Potential energy

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

What is fitted in telephone receiver?

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Electromagnet

Diaphragm

Both a and b

None of these

What does the term e-mail stand for?

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Emergency mail

Electronic mail

extra mail

external mail

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

The amount of current that can be felt is:

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1A

0.1A

0.001 A

2A

Electric field lines were introduced by:

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Faraday

Newton

Coulomb

Joule

Magnification of mirror is given by:

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m=p/q

m=q/p

m=pxq

m=1/p+q

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