Question # 1

Which is not a hardware device?

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CPU

Windows

Keyboard

Mouse

The unit of frequency is:

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Heartz

Vibration per second

Cycle per second

all a, b, c

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

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Centre

Principal focus

Pole

Radius

The quantities, whose values remain constant or vary continuously are called.

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Analogue quantities

Digital quantities

Maximum quantities

Minimum quantities.

The phenomenon in which radiations convert the matter into positive and negative ions is called:

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Radio activity

Excitation

Ionization

Electrolysis

The half life of radium 226 is

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1600 year

1610 years

1620 years

1630 years

A thermistor is a dependent resistors:

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Heat

temperature

energy

mass

Safe level of noise depends on factors:

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One

Two

Three

Four

The water waves after striking the hurdle will:

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Reflect

Refract

Diffract

All a , b, c

In variable capacitor, dielectric medium is:

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Paper

Air

Mica

Ceramic

If the change of current in a circuit induces a current in another circuit, this phenomena is known as:

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Self induction

Mutual induction

Electromagnetic induction

None mutual induction

If focal length of a lens is 1m, then its power will be:

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1 D

0.5 D

1.5 D

1 D

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

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