Question # 1

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Bottom quark carries charge :

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2/3 e

-2/3 e

+1/3 e

-1 /3 e

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

NAND gate represented by:

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X = A. B

X = A+B

X= A.B

X=|A+B|

The toner of printer is given

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Positive charge

Negative charge

Neutral

First positive then negative

If F1 and F2 are teh magnetic forces acting on a particle and electron respectively when moving perpendicular to the magnetic field then.

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F1=F2

F1>F2

F1<F2

F1 = 4F2

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

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X rays

Gama rays

Heat Radiation

Ultraviolet rays

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

Heat generated by a 40 W bulb in one hour is.

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140 J

1440 J

14400 J

144000 J

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

The output of two input is zero only when its.

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Both inputs are zero

Either input is zero

Both inputs are one

Either input is one

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

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