Question # 1

Sunlight is directly transformed to electricity with the help of:

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Solar cells

Diod

Rectifier

Transistor

A device which does not allow current to pass through it overt a certain limit:

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Switch

circuit breaker

Resistor

Fuse

Word"Computer" is derive from.

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Machine

Calculator

Compute

All of these

The substances through which current can pass easily are called:

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conductors

insulators

Semi - conductors

Non - Electrolytes

The rays which are liberated from metal due to collision of fast moving electrons:

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Alpha rays

Beta rays

Gamma rays

x - rays

---------------- lasers are presently used for operating cataract and glaucoma.

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Argon

Neon

Helium

Hydrogen

Laser surgery is of special importance in

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heart operation

kidney operation

liver operation

cancer operation

Energy of moving charges is called.

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Heat energy

Light energy

Electricla energy

Kinetic energy

Which of the following is a brain of computer?

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Central processing unit

Mouse

Monitor

Hard disc

Hovering satellite completes its rotation in 24 hours at the height of:

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360 km

3600 km

36000 km

360000 km

Skylab enters back into atmosphere.

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In 1979

In 1990

In 2000

In 2003

The Country which launched space station Mir into space:

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France

British

America

Russia

The Si unit of energy :

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meter per second

meter

joule

kilowatt hour

The SI unit of capacitance is:

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Farad

Ampere

Ohm

Newton

The Phenomenon of emission of radiations from radioactive elements is called:

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Doping

Allotropy

Radioactivity

Induction

Energy possessed bu a body due to its motion is known as:

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Kinetic energy

Heat energy

Electric energy

Chemical

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