Question # 1

A positive and negative charges are initially 4 cm apart. When they are moved closer together so that they are now only 1 cm apart, the force between them is:

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4 times smaller than before

4 times larger than before

8 times larger than before

16 times larger than before.

Electronics is the study of principles by means of which we control the:

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Flow of electrons.

Nuclear fission

Fusion reaction

Radiations

The colour of live wire is:

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Black or blue

Green or yellow

White or grey

Red or brown

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

Five joules of work is needed to shift 10 C of charge from one place to another. The potential difference between the places is:

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0.5 V

2 V

5 V

10 V

The angle of which prism deviates the incident ray is called:

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angle of incident

angle of reflection

angle of deviation

angle of minimum deviation

An object is 14 cm is 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

The standard group of bits in digital electronic is:

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5 bits

6 bits

7 bits

8 bits

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

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2 V

9 V

18 V

36 V

Which waves of the following has highest frequency?

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Radio waves

Micro waves

Light wave

Sound wave

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

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Refracted ray

Incident ray

Reflected ray

Emergent ray

The amount of current that causes the loss of muscle control is:

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0.1A

0.015A

2A

1A

Concave mirror formula is given by:

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R = 2r

sin<i/sin<r

1/f=1/p+1/q

1/f=1/p-1/q

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