Question # 1

Magnetic effect of current is used

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To detect a current

To measure a current

In electric motor

All of above

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

The mass of beta particle is equal to the mass

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Proton

Neutron

Electron

Photon

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

A rheostat can operate as.

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Amplifier

Potential divider

Oscillator

Transformer

The particles equal in mass but greater than proton are.

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Mesons

Baryons

Leptons

Hadrons

The brightness of the spot of CRO screen is controlled by.

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Anode

Cathode

Grid

Deflecting plates

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

The head produced by the passage of current through a resistor is.

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H= I²Rt

H = IR²t

H = 1/Rt

H = I²/Rt

Phase difference between V and I of an A.C through resistor is.

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Zero Degree

90 ^o

80^o

120^o

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

Which of the following series of hydrogen spectrum lies in ultra violet region.

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Lyman sereis

Paschen series

Balmar series

Bracket series

NC-1 is the SI unit is

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Force

Charge

Current

Electric intensity

Gamma rays from cobalt -60 are used for treatment of.

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Circulation of blood

Cancer

Heart Attack

Thyroid glands

A positron is a particle having.

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Mass equal to electron

Charge equal to electron

Mass equal to mass of electron but charge opposite to charge of electron.

Mass equal to proton

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

The energy of photon for photoelectric effect is less than

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1 MeV

2 MeV

5 MeV

8 MeV

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