Question # 1

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

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2V

9V

18V

36V

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

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

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

Which type of image is formed by a convex lens on a screen:

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Inverted and real

Inverted and virtual

Upright and real

Upright and virtual

Which combination forms NAND gate:

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AND & OR

AND & NOT

NOT & OR

NAND & NOT

In OR operation inputs are connected as:

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Series

Parallel

Both series or parallel

None of these

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

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1.62

1.69

5.25

2.75

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

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potential difference

Energy

Coulomb

Electric current

Half of radius of curvature is called:

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Focal length

Principal focus

Axis

Aperture

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

Mathematical form of Ohm's law is:

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V = IR

V = I2R

V = Qt

V = IR2

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