Question # 1

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

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

If current is flowing from bottom end to the top end in a wire, according to right hand rule the direction of line of forces would be:

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Anti-clock wise

Clock wise

Left and Right

Along the conductor.

Number of poles in a magnet is:

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One

Two

Three

Unlimited

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

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

Which type of energy is converted into mechanical energy in the D.C. Motor.

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Magnetic energy

Heat energy

Electrical energy

Chemical energy

One micro coulomb charge is equal to:

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10^-3c

10³c

10⁶c

10^-6c

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

The coil of a transformer which is connected to A.C is called:

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Primary coil

Secondary coil

Field coil

Armature coil

Totally reflecting prism is used in:

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Periscope

Binoculars

Periscope and binocular

Telescope

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