Question # 1

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

The standard group of bits in digital electronic is:

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5 bits

6 bits

7 bits

8 bits

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

The speed of light in water is:

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2.0x10³ ms^-1

2.5x10³ ms^-1

2.3x10⁸ ms^-1

2.3x10^-8 ms^-1

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

In NOT gate number of input terminals is/are:

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1

2

3

4

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

When did Michael Faraday discover Electromagnetic induction?

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1841

1831

1821

1811

In totally reflecting prism one angle is of 90°, and other two angles are of:

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30°,30°

45°,90°

45°,45°

40°,40°

What is the direction of the magnetic field lines inside a bar magnet?

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From north pole to south pole

From south pole to north pole

From side to side

There are no magnetic field lines.

Number of poles in a magnet is:

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One

Two

Three

Unlimited

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

The line which passes through pole of the mirror and center of curvature is called principal:

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Axis

Focus

Line

None of these

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10th Class Physics Chapter 15 Electromagnetism English Medium KPK Boards Online Mcqs MCQs With Answers

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