Question # 1

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

Selenium is

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Insulator is dark

Insulator in light

Conductor in dark

Semi conductor in dark

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

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Bevm

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

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zero

90 ^o

180 ^o

45^o

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

Soft magnetic material is

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Sodium

Steel

Iron

Copper

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

The charge number of Ba is.

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197

141

56

85

If both the length and radius of the rod are doubled, then the modulus of elasticity will:

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Increase

Decrease

Remains the same

Doubled

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

For ohmic device the graph between V and I is.

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A straight line

Curve

Hyperbola

Parabola

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

The vessel containing the tow electrodes and liquid to known as.

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Chemical cell

Volt cell

Volta cell

Volta meter

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

The negative sign with induced emf in Faraday's law is in accordance with

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Lenz's law

Amperes law

Boyle's law

Gauss law

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

A PN junction can not be sued a.

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Rectifier

Amplifier

Detector

LED

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

If a charge is at rest in a magnetic field then force on charge is

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Zero

Double

One fourth

Four times

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