Question # 1

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

The relative permitivity of air is

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79.5

1.006

1.06

1.0006

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

At 0 K a piece of silicon is a

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Conductor

Semi-conductor

Insulator

All

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

In glass, molecules are irregularly arranged so it is known as.

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Solid

Liquid

Solid liquid

Gas

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

The mass spectrum of naturally occurring neon shows the most abundant isotope has atomic mass.

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19

20

21

22

The sensor of light is.

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Transistor

LED

Diode

Light dependent resistance

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

The algebraic sum of potential change in a closed circuit is zero.

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Kirchhoff's 1st rule

Kirchhoff 2^nd rule

Krichoff's 3^rd rule

Kirchhoff 4^th rule

A positive charge is moving towards an observer, The direction of magnetic induction will be.

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Toward right

Anti clockwise

Clockwise

Toward left

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

The Kirchhoff 1^st rule is manifestation of:

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Law of conservation of mass

Law of Conservation of charge

Law of conservation of energy

None of above

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

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