Question # 1

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

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Armature

Magnet

Slip rings

Commutator

For non-ohmic devices, the graph between V and I is

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Not a straight line

A straight line

A curve

All of above

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

The main use of A.C is

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Minimum line losses

Long distance transmission

Stepping up to required voltage only

Steeping down to required voltage only

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

The number of neutron present in a nucleus in a given by

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N = A+Z

N = A- z

N = Z - A

N = A X Z

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

Shear modulus is expressed as:

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G = tanθ/F/A

F/A/tanθ

F/tanθ

tanθ/A

The function of three anodes a C.R.O is

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To accelerate electrons only

To focus the electrons only

To control the brightness of spot on screen

To accelerate and focus the electrons

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

In Wilson cloud chamber, ß-particles leave

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Thin and continuous tracks

Thick and continuous tracks

No tracks

Thin and discontinuous tracks

The movement of conductor in magnetic field produces electrical current was discovered in:

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1931

1731

1842

1831

The dimensions of magnetic flux are

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M¹L^-2T¹A¹

MLT^-2A^-1

ML²T²A^-1

ML²T^-2A^-1

If both the magnitude of charges and distance between them is doubled, then coulomb's force will be.

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Doubled

Hlaf

Remain same

One fourth

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

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