Question # 1

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

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

In mathematical form of Ohm's law, "R" is:

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Resistance

Specific resistance

Resistor

Resistivity

The unit of (ρ) in formula R=ρ.L/a is______________.

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Ω

Ω-m

Ω-m²

Ω-m^-2

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

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totally reflected

Partially reflected and partially transmitted

Totally transmitted

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

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

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1.62

1.69

5.25

2.75

Which wire has lowest resistance?

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Thick wire

Thin wire

Very thin wire

All

Mathematical formula of electromotive force (e.m.f) is:

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E = W/Q

E = Q/W

E = WQ

E = W2Q

The rate of flow of charge through any cross-sectional area is called:

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potential difference

Energy

Coulomb

Electric current

According to Ohm's law V =________

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I²R

IR²

IR

I/R

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

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Physics 10th Class English Medium Unit 5 Online Test MCQs With Answers

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