Question # 1

Frequency of tuning fork depends upon its …………. of prongs:

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Weight

Speed

Mass

Distance

Mice can hear frequencies upto:

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100, 000 Hz

25.000 Hz

120,000 Hz

1,000 Hz

Safe level of noise depends on factors:

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One

Two

Three

Four

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

How many tubes or electron guns used in a colour television set:

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Two

Four

Five

Three

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

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

If we double the distance between two charges, then force becomes

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4-times

1/4th

Double

Half

The SI the unit of charge is:

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Jpi;e

Volt

Coulomb

Watt

SI unit of electric potential is:

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Watt

Volt

Coulomb

Joule

X=A.B. This equation is used for which operation:

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AND

OR

NOT

NAND

When frequency of sound wave is increased, which of the following decreases:WavelengthPeriodAmplitude

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(i) Only

(iii) Only

(i) And (ii) only

(i) And (iii) only

The SI unit of electric field intensity is:

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NC-2

NC-1

Ns

Nm-1

Sound waves having frequency higher than 20,000 Hz are called:

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Ultrasonic

Infrasonic

Audible

Echo

The intensity level of whispering is:

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20 dB

30 dB

40 dB

50 dB

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate?

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the rod and the paper are oppositely charged

the rod acquires a positive charge

the reod and the paper have the same charges

the rod acquires a negative charge

Field around a charge in which that charge exerts a force on a point charge brought in that field is called:

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Electric field

Magnetic field

Neutral zone

Point charge

Intensity level of the sound produced by mosquito buzzing is:

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70 dB

40 dB

10 dB

120 dB

Unlike charges always:

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Repel each other

Attract each other

Sometimes repel and attract each other

Both A and B

The intensity level of train siren is:

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150 dB

100 dB

130 dB

120 dB

The sound level of rustling of leave is:

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1 dB

20 dB

30 dB

10 dB

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