Question # 1

The solar energy falling on the atmosphere of Earth is almost:

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1.2 Kilowatt per square meter

1.4 kilowatt per square meter

1.6 kilowatt per square meter

1.8 kilowatt per square meter

Phosphorous.... and sulphur 35 are employed on living system to trace metabolic path.

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31

30

38

32

The current flow from p-type semi conductors is due to.

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Free electrons

Valance electrons

Doping

Hole

The energy of moving charges is called:

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Light energy

Heat energy

Chemical energy

Electrical energy

Two American astronauts namely Neil Armstrong and Edwin Aldrin landed on the moon by:

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Apallo l

Apallo ll

Suptnik l

Sputnik ll

The Si unit of power is;

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Joule

Ohm

Watt

Ampere

In Pure -semi conductors no free electrons are available to conduct electric current at.

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Ordinary temperature

Low temperature

High temperature

None of these

The charge on alpha particle is:

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1

2

4

6

We can save eenrgy.

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1- By increaisng personal vehicles.

2- By making vehicles of beavier bodies.

3- By not walking

4- By avoiding unnecessary of energy.

The speed of radio wave is:

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Light

Air

Sound

Rocket

The Si unit of energy :

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meter per second

meter

joule

kilowatt hour

According to ohm's law , current and potential difference are:

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Inversely proportional

Directly proportional

Equal

Non of the above

If we increasing angle of incidence then at a particular angle incidence the angel of refraction is.

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45 ^o

60 ^o

30 ^o

90 ^o

Which of the following is used as rectifier;

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semi - conductor diode

resistors

capacitors

Germanium

The SI unit of resistence.

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Ampere

Volt

Hertz

Ohm

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

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Switch

circuit breaker

Resistor

Fuse

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