Question # 1

When a positive charge of 2 coulombs is placed at a point in an electric field, it experiences a force of 6N. The intensity of electric field at this point is:

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6 NC^-1

3 NC^-1

12 NC^-1

1.5 NC^-1

One of the isotopes of uranium is²³⁸U₉₂the number of neutrons in the isotopes is.

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92

146

238

330

The mirror whose outer surface is reflecting is called:

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Concave mirror

Convex mirror

Mirror

Lens

Which is not a hardware device?

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CPU

Windows

Keyboard

Mouse

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

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angle of incidence

critical angle

angle of refrection

None of these

Image formed on a camera is:

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Real, inverted, and diminished

Virtual, upright and diminished

Virtual, upright and magnified

Real, inverted and magnified

The half -life of carbon is

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5730 years

5700 years

5720 years

572 years

In electrostatic all charges are in:

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The same direction

Opposite direction

Motion

Static state

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

Old people can not hear sound above then _____ Hz

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1000

15000

20000

10000

What is the power rating of a lamp connected to a 12 v source when it carries 2.5 A?

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4.8 W

14.5 W

30 W

60 W

Time period is reciprocal of:

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Frequency

Cycle

Wave-length

Amplitude

Which is the most suitable means of reliable continuous communication between an orbiting satellite and earth:

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Mecrowaves

Radio waves

Sound waves

Any light waves

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