Question # 1

The quantity of U in the naturally occurring uranium is.

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0.2%

0.3%

0.7%

0.4%

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

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 relative permitivity of air is

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79.5

1.006

1.06

1.0006

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

A material which is insulator at 0 K and conduct at room temperature is.

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Silver

Lead

Germanium

Polythene

Drum of photocopier is made of.

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Copper

Aluminum

Nickel

Cobalt

James chadwick discovered:

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Proton

Positron

Neutron

Electron

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

Electric flux is a

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Vector quantity

Scalar quantity

Both (a) and (b)

None of above

Eddy current is produced when:

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A metal is light in varying magnetic field

A metal is kept in steady magnetic field

A circular coil is placed in a steady magnetic field

A current is passed through a circualr coil

The capacitance of a capacitor depends upon.

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Thickness of plates

Charges on the plates

Voltage applied

Geometry of the capacitor

Example of ductile substance is.

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Glass

Wood

Lead

Oxygen

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

Three resistors of resistance R each are combined in various ways, Which of the following cannot be obtained?

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3 RΩ

2R /4Ω

R/3Ω

2R /3Ω

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