Question # 1

The A.C. used in our houses has frequency _____ cycle/sec

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60

30

50

130

The speed of sound in a liquid is …………..than that in gases:

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Ten times

Fifteen times

Five times

Two times

The resistance of voltmeter is:

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zero

low

Very high

10Ω

In medical field, C.R.O is used to display:

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Heart beats

Pictures of organs

Pictures of bones

Blood pressure

Electric potential and e.m.f.

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are the same terms

are the different terms

have different units

both b and c

An object is placed at the Centre of curvature of a concave mirror. The image produced by the mirror is located:

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

The property of substance, which opposes the flow of current through it is called.

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Resistance

Reactance

Resistivity

None of these

The current used in houses is:

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A.C.

Conventiona current

Current

D.C

If a ray of light in glass is incident on an air surface at an angle greater than the critical angle, the ray will:

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Refract only

Reflect only

Partially refract and partially reflect

Diffract only

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

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

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Current

Power

Resistance

both a and b

The unit of power is _________

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Volt

Watt

Joule

Coulomb

Specific resistance of silver = ________ x 10^-sOhm-meter

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5.25

2.75

1.69

1.62

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