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

EMF is induced due to change in

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Charge

Current

Magnetic flux

Electric field

The most useful tracer is.

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Strontium -90

Iodine -31

Cobalt -60

Carbon -14

The mutual inductance between two coils depends upon their

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Size

Core material

Size, core material and separation

Separation

The physical quantity related to photon, that does not change in Compton scattering is.

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Energy

Speed

Frequency

Wavelength

The most refined form of matter is:

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Smoke

Light

Ice

Fog

The highest value reached by the voltage or current is one cycle is called:

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Peak to peak value

Peak value

Instantaneous value

Root mean square value

The number of Isotopes of cesium are.

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4

32

22

36

the substances in which the atoms do not form magnetic dipoles are called.

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Diamagnetic

Para magnetic

Ferro magnetic

Crystal

A.C. can be converted into D.C. by

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An oscillator

Detector

An amplifier

Rectifier

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

If V_rms be the root mean square value of emf then its peak to peak value is given by

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In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

The torque in the coil can be increased by increasing:

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No. of turns

Current and magnetic field

Area of coil

All of the above

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 photon while passing thorugh a magnetic field are deflected towards:

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North pole

South pole

Are ionized

None of these

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

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