Question # 1

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

Thermocouples convert:

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Heat energy into electrical energy

Heat energy into light energy

Heat energy into mechanical energy

Chemical energy into electrical energy

Which statement is true about the magnetic poles?

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Unlike poles repel

Like poles attract

Magnetic poles do not effect each other

A single magnetic pole does not exist

How does sound travel from its source to your ear?

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Byc changes in air pressure

By vibration in wires or strings

By electromagnetic waves

By infrared waves

LDR can act as:

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Diode

Switch

Transistor

Rectifier

According to ohm’s law V= :

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I²R

IR²

IR

I/R

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

Coaxial cable are used to transmit signals:

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Magnet

Electric

Mechanical

Both mechanical and magnet

A dielectric must be:

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Resistor

Insulator

Good conductor

Semi conductor

Magnetic effect of electric current was first discovered by:

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Faraday

Ampere

Volta

Lenz

the power of washing machine is:

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700 W

750 W

650 W

800 W

The current which does not change its direction is called:

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A.C

D.C

Conventional

Transient current

Which memory consists of integrated circuits?

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Primary memory

Audio cassette

Video cassette

Compact cassette

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