Question # 1

Mathematical form of Ohm's law is:

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V = IR

V = I2R

V = Qt

V = IR2

Specific resistance of copper is ____________ x 10^-8Ohm-meter

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1.62

1.69

5.25

2.75

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

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

We can distinguish between the notes of a piano and flute due to ………… of sound.

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Loudness

Pitch

Quality

Intensity

The index of refraction depends on:

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The focal length

The speed of light

The image distance

The object distance

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be:

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2Ω

4Ω

8Ω

12Ω

Which instrument measures the potential difference:

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Voltmeter

Barometer

Galvanometer

Ammeter

The S.I unit of electric power is:

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Volt

Watt

Ampere

Joule

How Galvanometer is connected in circuit to detect current?

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In Series

In Parallel

Fixed

Variable

Which one is a safety device?

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Switch

Fuse

Circuit breaker

Both B and C

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror:

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-4.1 cm

-8.2 cm

-9.9 cm

-20 cm

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