Question # 1

If there is divergence of leaves by touching a body with electroscope then the body is:

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Semi conductor

Neutral

charge body

Insulator

in a dry cell, chemical energy changes into:

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mechanical energy

electrical energy

potential energy

kinetic energy

Radio waves are:

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Electric waves

Electromagnetic waves

X-rays

Radio active ways.

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

The equivalent resistance in parallel combination is:

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R_c=R₁+R₂+R₃ +.................+R_n

R_c=1/R₁+1/R₂+1/R₃+.................+1/R_n

a and b

None of these

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

If a neutral body is brought near to the electroscope its leaves:

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Diverge

Contract

Shut

Remain in normal position

The speed of sound in iron at 25 ^oC is ms^-1

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5950

5900

6950

6940

Radioactive isotopes present in atmosphere is

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Cobalt -60

Ph-32

Carbon -14

Carbon -20

The resistance of voltmeter is:

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zero

low

Very high

10Ω

The index of refraction depends on:

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The focal length

The speed of light

the image distance

The object distance

Coulomb's law is mathematically stated as:

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F = k q1 q2/r3

F = k q2 q2 / r2

F = k q1 q2 / r

F = k q1 q2 / r2

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