Question # 1

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

The Grid 'G' in cathode ray oscilloscope.

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Accelerate as well as focus electron beam

Control no. of electrons beam

Is at - Ve potential with respect to cathode.

Both d and b

The sensitivity of galvanometer is given by

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CAN/B

C/BAN

BAN/C

BN/CA

If the resistance of 500 Ohm have fourth band of silver colour then its upper maximum resistance will be.

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600 Ohm

550 Ohm

450 Ohm

400 Ohm

Which material should be inserted between the plates of a capacitor in order to increase its capacitance.

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Copper

Mica

Iron

Tin

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

The expression P = VI hold only when current and voltage are.

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In phase

Out of phase

At right angle to each other

At angle of 120 ^o

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

In current carrying long solenoid the magnetic field produced does note depend upon

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of above

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

At resonance, the behavior of R-L-C series circuit is.

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Resistive

Capacitive

Inductive

Modulative

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

Transistors are made from

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Plastics

Metals

Insulator

Doped semi conductors

The unit of impedance is

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Farad

Henry

Tesla

Ohm

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

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