Question # 1

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

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4-times

1/4th

Double

Half

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

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Ultrasonic

Infrasonic

Audible

Echo

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

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10m

15m

17m

20m

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

Big unit of capacitance is:

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Farad

Volt

watt

coulomb

SI unit of electric intensity is:

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NC

NC^-1

NC^-2

NC^-3

If a charged body is brought near a negatively charged electroscope and the leaves of electroscope diverge, then the body is:

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Positively charged

Negatively charged

Neutral

None of these

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

Who developed the 1st practical electric battery:

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Alessandro volta

Faraday

Newton

None of these

The 1st practical electric battery is known as:

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Voltaic

Pile

Voltaic pile

Voltaic cell

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

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Two

Four

Five

Three

Bats can hear sound of frequency up to:

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100,000Hz

25000Hz

120, 000Hz

1000Hz

An object gains excess negative charge after being rubbed against another object, which is:

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Neutral

Negatively charged

Charged

Either, a,b,and c

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