Question # 1

in a dry cell, chemical energy changes into:

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mechanical energy

electrical energy

potential energy

kinetic energy

Watt is equal to:

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Coulomb per second

Newton per second

Volt per second

Joule per second

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

Safe level of noise depends on factors:

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One

Two

Three

Four

If the mass of the bob of a pendulum is increased by a factor of 3. The period of the pendulum's motion will:

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Be increased by a factor 2

Remain the same

Be decreased by a factor of 2

Be decresaed by a facro of 4

When 1 tonne of coal is burnt then amount of energy is released .

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36 x 10⁸ J

36 x 10⁹J

36 J

36 x 10¹⁰J

The half life of carbon -14 is:

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5730 years

5740 years

5750 years

5760 years

If the length of a simple pendulum is halved its time period will become:

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T/2

T = T/√2

√2T

2T

The output of an AND gate is only 1, when:

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Both of its inputs are zero

Anyone of the two inputs is zero

Both of its inputs are 1

Anyone of the two inputs is 1

The basic operations performed by a computer are.

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arithmetic operations

non arithmetic operations

logical operation

both a and c

The time period of simple pendulum can be calculated by:

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T = 2π√L/g

T = 2 π √m/k

T = 2 π √g/L

T = 2 π √K/m

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

None of these

A device which has two ways of communication is:

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television

radio

hard disk

mobile phone

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