Question # 1

Quantity that remains unchanged in a transformer is

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Voltage

Current

Frequency

None of these

If in a moving coil galvanometer a current 1 produces a deflection θ then

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i ∞ tan θ

i ∞ θ²

i ∞ θ

i ∞ √θ

Steel is preferred for making springs over copper.Whey?

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Steel is cheaper

Young's modulus of steel is more than that of copper

Young's modulus of copper is more than that of steel

Steel is less likely to be oxidized

A (100 W, 200 V) bulb is connected to a 160 V power supply. The power consumption would be

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64 W

80 W

100 W

125 W

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

Both transverse and longitudinal

The distance between node and anti-node is

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λ

λ/2

λ/4

2λ

Two masses of 1 g and 4 g are moving with equal kinetic energies The ratio of the magnitudes of their linear moments is:

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4 : 1

√2 : 1

1 : 2

1 : 16

A bullet is short from a rifle. As a result the rifle recoils, The kinetic energy of rifle as compared to that of bullet is

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Less

Greater

Equal

Cannot be concluded

Light appears to travel in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

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