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

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°

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

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

In C.R.O grid is always connected with potential:

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Negative

Positive

High positive

Zero positive

The cathode ray oscilloscope consists of main parts:

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Two

Three

Four

Five

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

The end of solenoid from which lines of force emerge out is called:

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North pole

South pole

North and south pole

None of these

Which animal have ability to move his eye lens:

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Snake

Fish

Ant

Tiger

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

The output of a NAND gate is 0 when:

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Both of its inputs are 0

Both of its inputs are 1

Any of its inputs is 0

Any of its inputs is 1

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

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