Question # 1

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

Shunt resistance is

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Low resistance

Zero resistance

High resistance

Impedance

The solids are classified as

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Polymeric

Amorphous

Crystalline

All of above

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

Eddy current is one cause energy loss in

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A.C. generator

Transformer

D.C. motor

D.C. generator

The central region of a transistor is called.

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Emitter

Collector

Base

Neutral

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

The unit of Rh is.

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ms-1

m

m²

m^-1

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

Recently superconductor discovered is at temperature.

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110K

143K

16.3K

119K

The energy of 4th Orbit in hydrogen atom is.

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-2.51 eV

-3.50 eV

-13.60 eV

-0.85 eV

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

A two inputs NAND gat with inputs a and b has an output '0' if.

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B is zero

A is zero

Both A and B are 1

Both A and B are '0'

In D.C. generator, split rings act as.

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Capacitor

Commutator

Resistor

Inductor

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

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