Question # 1

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Two oppositely charged balls A and B attract the third ball C, when placed near them turn by turn The third ball C must be.

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Positively charged

Negatively charged

Electrically neutral

Positively and negatively charged

Heat energy is converted into electrical energy.

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Solar cells

thermocouples

Electric generators

None of above

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The wave form of alternating voltage is a

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Cotangent curve

Cosine curve

Sine curve

Tangent curve

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

Photo diode is used for detection of.

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Heat

Magnet

Current

Light

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

Coercive force is used to

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Demagnetize the material

Magnetize the material

Extend it

None of these

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

The first theory about the structure of an atom was introduced by

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Neil Bohr

Einstein

Compton

Rutherford

Boher proposed his atomic model in:

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1910

1911

1912

1913

The SI unit of magnetic induction Tesla is equal to

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N-1 Am

NA m2

NA-1n2

NA-1m-1

The combined effect of resistance and reactance in circuit is called:

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Impedance

Inductance

Capacitance

None of above

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