Question # 1

The intensity level of train siren is:

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150 dB

100 dB

130 dB

120 dB

What happens to the intensity of the brightness of the lamps connected in series as more and more lamps are added?

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Increases

Decreases

Remains the same

Can not be predicted

The presence of fish by the other fish can be detected by:

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Magnetic field

Electric field

Gravitational field

All of above

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

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E = W/Q

E = Q/W

E = WQ

E = W2Q

Mathematical relationship between critical angle "C" and refractive index "n" is:

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N = C

N = 1 / sin c

N = 1 / cos c

N = 1 / sin2 c

A digital multimeter is used to measure:

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Current

Resistance

Potential difference

All of above

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

Simplest electrical circuits use:

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One wire

Two wires

Four wires

Five wires

The output of an AND gate is only 1, when:

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Both of its inputs are zero

Anyone of the two inputs is zero

Both of its inputs are 1

Anyone of the two inputs is 1

Field around a charge in which that charge exerts a force on a point charge brought in that field is called:

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Electric field

Magnetic field

Neutral zone

Point charge

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

The ray of light striking to the side of prism is called:

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refraction ray

incident ray

reflected ray

emergent ray

The displacement produced in the spring is directly proportional to force is called:

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Hook’s law

Boyle’s law

Newton’s law

Joule’s law

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