Question # 1

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

The refractive index of ice is:

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1.00

1.33

1.31

2.42

Information storage device work on the principles of:

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Heat

Sound

Light

Magnetism

which is a major cause of fires and explosions at many places:

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match sticks

bombs

static electricity

magnetism

The current which changes its direction is called:

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Current

A.C.

Conventional current

D.C.

1 Pico farad is equal to:

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10^-9F

10¹²F

10^-12F

10^-6F

Hard disk is made of:

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Aluminium

Copper

Iron

Plastic

A large ripple tank with a vibrator working at a frequency of 30 Hz produces 25 complete waves in a distance of 50 cm.

The velocity of the wave is:

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53 cms^-1

60 cms^-1

750 cms^-1

1500cms^-1

An object is 14 cm in front of a convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mirror:

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-4.1 cm

-8.2 cm

-9.9 cm

-20 cm

When a heavy nucleus splits into, lighter nuclei, the process would .

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Release nuclear energy

Absorb nuclear energy

Release chemical energy

Absorb chemical energy

The amount of current that can be felt is:

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1A

0.1A

0.001 A

2A

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

an additional wire used along with live and neutral wire is:

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cable wire

earth wire

grip wire

hot wire

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