Question # 1

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.

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Increases

Decreases

Remains the same

Will be zero

Number of poles in a magnet is:

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One

Two

Three

Unlimited

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

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

The minimum value of angle of deviation is called:

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Minimum angle

Incident angle

Angle of minimum deviation

None of these

According to coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation increases:

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Increases

Decreases

Remains unchanged

Cannot be determined

In SI the unit of charge is:

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Joule

Volt

Coulomb

Watt

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

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.

A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be:

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0 volt

30 volts

45 volts

60 volts

To see from submarine and the ship at the surface of water, we use:

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Telescope

Microscope

Periscope

Prism

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

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