Question # 1

Which type of impurity is to be added to a pure semi conductor crystal to provide holes.

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Monovalent

Trivalent

Tetravalent

Pentavalent

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

The number of electrons in one coulomb charge is equal to

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6.2 x 10¹⁸ electrons

Zero electrons

1.6 x 10^-22 electrons

6.2 x 10²¹ electrons

If the length and number of turns of a solenoid are doubled strength of magnetic field with.

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Be doubled

Become half

Not change

Be four time

Rutherford performed on experiment on a nuclear reaction in:

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1921

1981

1927

1932

Xc =

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1/2πfc

2πfc

2π/fc

fc/2π

A particles equal or greater in mass than of protons are called.

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Baryons

Leptons

Mesons

Quarks

Alpha particle carries a charge.

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-e

+2e

-2e

No charge

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

Number of Isotopes of Neon gas are

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2

3

4

1

The following gas was identified in the sun using spectroscopy

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Hydrogen

Helium

Carbon

Nitrogen

Which of the following converts electrical energy into mechanical energy.

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Transformer

A.C. generator

D.C. generator

D.C. motor

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

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

If current flowing through a solenoid becomes four times, then magnetic field inside becomes.

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two times

three times

four times

Half

e/m=

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v/Br

Br/V

VB/r

Vr/B

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

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