Question # 1

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

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potential difference

Energy

Coulomb

Electric current

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

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 value or current I passing through a conductor is inversely proportional to:

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Temperature

Potential difference

e.m.f.

resistance

The distance between two consecutive compressions or rarefactions in longitudinal waves is called:

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Amplitude

Wavelength

Half wavelength

1/4 wavelength

Which wire has lowest resistance?

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Thick wire

Thin wire

Very thin wire

All

Example of mechanical waves is:

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Radio waves

X-rays

Light waves

Sound waves

Waves transfer:

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Energy

Wavelength

Velocity

frequency

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

The minimum value of angle of deviation is called:

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Minimum angle

incident angle

angle of minimum deviation

None of these

Radio waves are:

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Longitudinal waves

Transverse waves

Electromagnetic waves

All of these

The speed of sound in iron at 25°C is:

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5950 m/sec

5900 m/sec

6950 m/sec

6940 m/sec

What will be the capacitance of capacitor by joining them in parallel:

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Increased

Much less

Decrease

No change

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