Question # 1

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

Aperture

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power.

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remains unchanged

halves

doubles

four time

The equivalent resistance in parallel combination is:

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R_c=R₁+R₂+R₃ +.................+R_n

R_c=1/R₁+1/R₂+1/R₃+.................+1/R_n

a and b

None of these

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

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1.62

1.69

5.25

2.75

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

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

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

As the temperature of a conductor rises, its resistance.

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Increase

Decrease

Does not change

None of these

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

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

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Positive ions

Negtive ions

Positive charge

free electron

The characteristics of sound by which we can distinguish between two sounds of same loudness and pitch is called.

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Intensity

Quality

Loudness

Pitch

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

AND operation is represented by:

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Dot (.)

Addition (+)

Division (÷)

Minus (-)

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