Question # 1

A substance having the negative temperature co efficient of resistivity out of the following is.

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Carbon

Iron

Tungsten

Gold

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Magnetic flux density at a point due to current carrying coil is determined by

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Ampere's law

Faraday's law

Lenz's law

Gauss's law

Magnetic lines of force are.

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Imaginary

Real

Perpendicular

In phase with electric lines of force

The motional emf is give by

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qvB

IBL

eBL

vBL

One joule is equal to.

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1.6 x 10¹⁹ eV

1.6 x 10^-19 eV

6.25 x 10^-18 eV

6.25 x 10 ¹⁸ eV

During each cycle A.C. voltage reaches a peak value.

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Once

Twice

Thrice

Four time

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

Which particle has larger range in air.

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Alpha rays

Gama rays

Beta rays

Neutron

The Basic circuit element in a D.C. circuits which controls the current and voltage is

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Resistor

Inductor

Capisitor

Transistor

During negative half cycle of A.c then p-n junction offers.

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High resistance

Low resistance

No resistance

All of these

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

In an electronic transition atom cannot emit.

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Infrared radiations

Visible radiations

Ultraviolet radiations

Gama radiations

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