Question # 1

Isotopes are atoms of same element with different :

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Atomic mass

Atomic Number

Number of proton

Number of Neutron

Power of convex lens is 10 D. Its focal length is:

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100 m

10 m

1 m

0.1 m

The unit of spring constant is:

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m

kg

Nm²

Nm^-1

Specific resistance of silver is:

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1.7x10^-8 Ω.m

2.63x10^-8 Ω.m

2.75x10^-8 Ω.m

7.0x10^-8 Ω.m

An example of input device of computer is.

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Key board

Printer

Monitor

RAM

The symbol of alpha particles is:

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4AHe

42He

0-1B

00Y

Which we double the voltage in a simple electric circuit. We double the

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Current

Power

Resistance

both a and b

battery is one of the source of:

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heat

light

current

sound

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

Which radiations are free of effect of electric and magnetic field?

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Alpha

Beta

Gamma

Alpha and beta

An electric current in conductors is due to the flow of:

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Positive ions

Negtive ions

Positive charge

free electron

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

The ray of light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

Radius

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