Question # 1

Optical fibres works on the principle of:

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Reflection

Refraction

Total internal reflection

Diffraction

The force on a current carrying conductor is maximum if angle between field and conductor is:

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0^o

90^o

180^o

45^o

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

The ray of light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

Radius

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

A current carrying conductor produces a field around it is called:

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Electric field

Magnetic field

Both a and b

None of these

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

Which device is used to increases / decreases A.C Voltage?

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Electric motor

Transformer

A.C Generator

Solenoid

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Physics 10th Class English Medium Unit 6 Online Test MCQs With Answers

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