Question # 1

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.

Who discovered Electromagnetic induction?

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Michael Faraday

Flemiing

Ohm

Coulomb

The lines will be in the form of concentric circles, if conductor is:

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Circular

Straight

Solenoid

None of these

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is:

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The same as direction of field

Opposite the direction of field

Makes an angle of 45^owith the current

At right angle to both the field and the current.

The direction of induced e.m.f. in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

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

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

Eight bits combine to form:

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A byte

Megabyte

Kilobyte

Gigabyte

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 A.C. generator flux will be zero if coil is to the field.

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90^o

45^o

Parallel

Inclined

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°

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

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