Question # 1

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

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Armature

Commutators

Split rings

Source of emf

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The potential difference between the head and tail of an electrical to

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600 Volt

700 Volt

800 Volt

900 Volt

Number of Isotopes of Neon gas are

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2

3

4

1

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

Max planck received noble prize in:

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1927

1932

1918

1914

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The unit of induced emf is

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Ampere

Volt

Joule/coulomb

Both (b) and (c)

An ideal current source shall have resistance

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Zero

Finite but not zero

Infinite

Depend upon requirement

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

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

For Paschen series, the value of 'n' starts from

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2

4

6

8

Sensitivity of a galvanometer can be increased by

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Decreasing the value of torsional couple

Decreasing number of turns

Decreasing area of plane of coil

Decreasing magnetic field

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