Question # 1

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

If D.C. input for step up transformer, the output is

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Zero

High

Low

May be high or low

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

The ability of a body to return to its original shape is called.

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Strain

Stress

Elasticity

Plasticity

The symbol of p-n-p transistor is

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Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

The condition of resonance is:

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XL = 1/2 Xc

X_L = X_c

X_c = 4_x2

None of above

The reciprocal of decay construct lamda of a radioactive element is.

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Half life

Mean life

Curie

total life

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

In Millikan's oil drop experiment a charged particle of mass 'm' is in equilibrium in an will

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Zero

g/2

g

2g

James chadwick discovered:

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Proton

Positron

Neutron

Electron

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

Max planck received noble prize in:

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1927

1932

1918

1914

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