Question # 1

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

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Ω

Ω-m

Ω-m²

Ω-m^-2

The point through which rays of light pass after reflection from concave mirror is called principal:

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Focus

Circle

Axis

Radius

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease the resistance of the circuit

to provide each appliance the same voltage as the power source

to provide each appliance the same current as the power source

What is the voltage across a 6Ω resistor when 3 A of current passes through it?

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2 V

9 V

18 V

36 V

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

Aperture

The unit of power is _________

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Volt

Watt

Joule

Coulomb

Which wire has lowest resistance?

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Thick wire

Thin wire

Very thin wire

All

The index of refraction depends on:

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The focal length

The speed of light

The image distance

The object distance

Which type of image is produced by the converging lens of human eye if it views a distant object:

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Real, erect, same size

Real, inverted, diminished

Virtual, erect, diminished

Virtual, inverted, magnified

An electric current in conductors is due to the flow of:

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Positive ions

Negtive ions

Positive charge

free electron

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

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5.25

2.75

1.69

1.62

What type of graph is in between V and I?

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Curved

Parabola

Straight line

None 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

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