Question # 1

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

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Positive ions

Negtive ions

Positive charge

free electron

The unit of resistance is:

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Ω-m

Ω

V

C

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

The index of refraction depends on:

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The focal length

The speed of light

The image distance

The object distance

The equivalent resistance of a parallel combination is

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equal to sum of all resistance

is greater than the largest resistance of combination

is smaller than the smallest resistance of combination

All of these

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

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Ω

Ω-m

Ω-m²

Ω-m^-2

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

Resistance of conductor is directly proportional to:

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Length

Pressure

Area

All of these

AND operation is represented by:

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Dot (.)

Addition (+)

Division (÷)

Minus (-)

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

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1.62

1.69

5.25

2.75

How Galvanometer is connected in circuit to detect current?

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In Series

In Parallel

Fixed

Variable

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

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Heart beats

Pictures of organs

Pictures of bones

Blood pressure

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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