Question # 1

Electric field lines of force were first introduced by:

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Ampere

Farady

Fleming

Coulomb

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.

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

1 Pico Farad is equal to:

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10^-9F

10^-12F

10¹²F

10^-6F

The speed of sound was accurately measured in:

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1736

1737

1738

1739

NOT gate is also called:

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Converter

Inverter

Transmitter

Receiver

Electric intensity is a quantity.

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Scalar

Vector

Base

None of these

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

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4-times

1/4th

Double

Half

Ultrasound waves carry energy:

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Less

More

Equal

None of these

In case of OR and AND operation, if switches s₁ and s₂ both are open then lamp is:

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On

Off

Sometimes on and sometimes off

Neither on nor off

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

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336ms^-1

343ms^-1

430ms^-1

470ms^-1

Safe level of noise depends on factors:

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One

Two

Three

Four

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

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