Question # 1

The peak value of alternating current is 5√2 A. The mean square value of current will be:

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5A

2.5A

5√2A

5²

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Which one has greater cone of impurity among all:

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Emitter

Base

Collector

All are pure

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

Anti particle of electron is

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Proton

Photon

Neutron

Positron

mho -m-1 is the unit of.

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Resistance

Resistivity

Conductance

Conductivity

When some di electric is inserted between the plates of a capacitor, then capacitance.

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Decreases

Increases

Becomes zero

Becomes infinity

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

GM counter uses

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Alcohol only

Bromine

argon

Neon and bromine

e.m.f is the conversion of --------------- energy into electrical energy

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Chemical

Solar

Light

None of these

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

Number of Isotopes of Neon gas are

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2

3

4

1

The conventional current is due to the flow of

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Atoms and molecules

Positive charge

Negative charge

Bot (b) and (c)

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 natural frequency of L.C circuit is equal to

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Total flux through a closed surface depends on.

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Shape of surface

Medium only

Charge enclosed only

Charge and Medium

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