Question # 1

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

Which one is not a ductile material

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Lead

Steel

Copper

Wrought Iron

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

Rectification is the process of converting.

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D.C. into A.C.

A.C. in to D.C.

Low signal to high

High signal to low

The main reason for world wide use of A.C is because:

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It is very high power

It can be transmitted over long distance

It is cheaper to use

ALl of above

Which of the following is similar to electron.

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Beta particle

Alpha particle

Neutron

Proton

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Production of x rays is reverse process of

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Photo electric effect

Compton effect

An nihilation

Pair production

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

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

Concept of the electric field lines is introduced by

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Coulomb

Faraday

Einstein

Joseph henry

In photocopier, then drum is coated with layer of.

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Aluminium

Copper

Selenium

silver

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Brightness of screen of CRO controlled by

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Grid

Filament

Anode

Cathode

The unit of conductivity is:

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Ohm^-3m^-1

Ohm m^-1

Both a and b

Ohm m^-1

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

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