Question # 1

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

Einstein photoelectric equation is

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None of these

The curie temp for iron is about

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800^oC

740^oC

750^oC

650^oC

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

The heat produced by passage of current.

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H=I²Rt

H=IR2T

H=I/Rt

H=I²/Rt

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

The critical temperature of Aluminum is.

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3.72 K

1.18 K

7.2 K

8.2 K

The value of maximum output power is?

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E/4R

E²/4R

E/4R²

Non of above

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

Galvanometer is sensitive when C/BAN is

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zero

Large

small

Negative

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

If 10 A current passes through 100 mH inductor, then energy stored is.

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100 J

5 J

20 J

Zero

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Magnetic lines of force are.

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Imaginary

Real

Perpendicular

In phase with electric lines of force

There are different crystal systems. The number of these crystal system is.

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3

4

5

7

The Lenz's law is also statement of:

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Law of conservation of mass

Law of conservation of charge

Law of conservation of energy

Law of conservation of momentum

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