Question # 1

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

In the presence of a charged body, an insulated conductor develops positive charge at one end and negative charge at the other end, this i- called:

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Electrostatics

Electrostatic induction

Magnetism

Electromagnetic induction

Bats can hear sound of frequency up to:

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100,000Hz

25000Hz

120, 000Hz

1000Hz

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

The speed of sound in are water at 25°C is:

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1530ms-1

1531ms-1

1560ms-1

1570ms-1

According to Coulomb's law , what happens to the attraction of two oppositely charged objects as their distance of separation increases?

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Increase

Decreased

remain unchanged

can not be determined

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

Level of noise recommended in eight, hour work day:

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80-90 dB

80-85- dB

85-90 dB

90-95 dB

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

One micro coulomb charge is equal to:

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10^-3 C

10³C

10⁶C

10^-6C

Five joules of work is needed to shift 10 C of charge from one place to another. The potential difference between the places is:

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0.5 V

2 V

5 V

10 V

To hear echoes, the minimum distance of the obstacle from source of sound should be:

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10m

15m

17m

20m

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

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4-times

1/4th

Double

Half

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