Question # 1

The ratio of external force applied on the spring to displacement is called:

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Hook's law

Constant

Spring constant

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

None of these

The step-up transformer

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Increases the input current

Increase the input voltage

Has more turns in the primary

Has less turns in hte secondary coil

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 of 2

Remain the same

Be decreased by a factor of 2

Be decreased by factor of 4

Positive charge in an electric field always tend to move:

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Does not move

From lower to higher potential

From higher to lower potential

All of these

Radio waves are:

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Longitudinal waves

Transverse waves

Electromagnetic waves

All of these

Simplest electrical circuits use:

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One wire

Two wires

Four wires

Five wires

The formula of time period of simple pendulum is:

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T = 2π √L/g

T = 2π (L/g)

T = 2π√1/g

T = 1/2π √L/g

Bets can hear sound of frequency up to:

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100,000 Hz

25000 Hz

120,000 Hz

1000 Hz

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

If the distance between two point charges is reduced to half, the coulomb’s force become:

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Half

Two times

One fourth

Fourth times

The distance between principal focus and pole of mirror is called:

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Principal focus

Focal length

Aperture

Image

The unit of frequency is:

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Heartz

Vibration per second

Cycle per second

all a, b, c

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