Question # 1

Donor impurities are

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Germanium, silicon

Indium, galium

Antimony, arsenic

Diamond, carbon

The jerks in D.C. motor are created by the use of.

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Armature

Commutators

Split rings

Source of emf

The emf induced by the motion of a conductor across a magnetic field is called:

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Motional emf

Rotational emf

Induced emf

All of above

In a coil current change from 2 to 4 A in .05 s . If the average induced emf is 8 V then coefficient of self-inductance is:

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0.2 henry

0.1 henry

0.8 henry

0.04 henry

The bnding energy for nucleus A is 7.7 Me V and that for nucleus B is 7.8 MeV. Which nucleus has the larger mass?

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Nucleas A

Nucleus B

Less than nucleus

None of these

The galvanometer can be made sensitive by making the factor BAN/C

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Large

Small

Constant

Zero

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

The SI unit of magnetic permeability is.

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WbA-1m-1

Wbm-2

WbmA-1

WbAm-1

The rest mass x ray photon is

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Infinite

Zero

1.67 X^-17 kg

All of the above

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

A pair of quark and anti quark makes a.

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Meason

harden

Lapton

Baryon

The total charge of any nucleus is:

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Ze

Z

Both a and b

None of above

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

Which one has the least resistance.

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Galvanometer

Ammeter

Ohm meter

Volta meter

Energy produced due to fission of uranium atom is:

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500MeV

200MeV

700MeV

750MEV

Which of the modulus of elasticity is involved in compressing a rod to decrease its length ?

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Young's modulus

Bulk modulus

Modulus of elasticity

None of these

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