Question # 1

A soft iron cylinder is placed inside coil galvanometer to:

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Make field circular and strong

Make field radial and weak

Make field radial and strong

All of above

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Self induction does not depend on

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Number of turns of the coil

Area of cross section of the core

Nature of material of the core

Current through inductor

The charge on Beta particle is

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+e

-e

-2e

None of these

For computation of electric flux, the surface area should be.

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Parallel

Flat

Curved

Spherical

The value of Rydberg constant is:

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1.0749x10⁷m^-1

1.0974 x 10⁷ m^-1

1.974 x10⁶m^-1

1.0974 x 10^-7 m^-1

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

One henry is equal to

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1 ohm x 1 sec

1 ohm x 1 hertz

1 ohm x 1 metre

All of above

Commentator was invented by

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Henry

Ousted

Maxwell

William sturgeon

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

For which material medium, force between two charged particles is maximum.

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Ammonia

Germanium

Mica

Teflon

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

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

The number of neutrons in Li are

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2

3

4

7

Which diode works at reverse biasing.

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LED

Photo voltaic cell

Photo diode

Silicon diode

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

The number of lines per unit area passing perpendicular through an area is called

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Flux

Electric intensity

Both (a) , (b)

None of these

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