Question # 1

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

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

Nuclear fission was discovered by:

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Otto Hahn

Friz strassmann

Both a and b

Michaelson

Transistor was discovered by

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Young

Curie

John Bardeen

Shale's

The north pole of a magnet is brought near a metallic ring. The direction of induced current in the ring will be:

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Antoclockwise

Clockwise

First Clockwise and then Antoclockwise

First anticlockwise and then Clockwise

The phase difference between current and voltage in an inductive circuit is.

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zero

90 ^o

180 ^o

45^o

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

Main reason for world wide use of A.C. is

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It is cheaper

Transmitted

Botha a and b

Reaches in short time

In case of A.C. through resistor V and I are

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At 0^o with each other

At 180 ^o with each other

At 90^o with each other

At 270 ^o with each other

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

The conductor experience force, placed in magnetic above:

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Move towards weaker part of field

Move towards stronger part of field

Remains at rest

Move upwards in space

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, Then

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The charge in the plates reduces and potencial difference increase

Potencial difference between the plates increase, stored energy decreases and charge remains the same

Potencial difference between the plates decreases, stored energy decreases and charge remains unchanged

None of them

An ECG records the _____ between points on human skin generated by electric process i the heart.

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Heart beat

Pulse rate

Pressure

Voltage

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

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