Question # 1

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

For the normal operation of transistor the emitter base junction is always.

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Zero biased

Reverse biased

Forward bised

Both a and b

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

The half life of radium -226 is

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1620 years

45 x 10⁹ years

3.8 days

23.5 minutes

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

The minimum amount of energy in an individual electron has to gain to escape from a particular surface is called.

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Threshold frequency

work function

Wave number

Kinetic energy

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

Beta decay may occur by

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Beta minus

Beta Plus

Electron capture

All of these

When an object moves with a very high speed the length in the direction of motion.

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Contracts

Expands

Remains the same

Becomes infinity

Which animal did Erwin Schrodinger contemplate using in his famous thought experiment.

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mouse

Cat

Dog

Rabbit

LASER beam my be measure very large distance because it is.

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Inidirectional

coherent

Monochromatic

Not absorbed

The force that bonds protons and neutrons together int he nucleus despite the electrical repulsion of the protons is called.

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Molecular force

Nuclear force

Atomic force

Gravitational force

The particles equal in mass or greater than protons are called.

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Mesons

Bosons

Baryons

Nucleons

Radioactivity is the phenomenon associated with the.

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Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

Why FET amplifiers are called voltage controlled devices.

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Input is a current signal

Output is a current signal

Input is a voltage signal

Output is a voltage signal

The average energy released per fission of U is about

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200 eV

2 keV

2 MeV

200 MeV

When Photon incident on a metal produce the emission of electrons the process is called.

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Photo electric effect

Pair production

x-rays production

Gama ray production

The ionization energy for hydrogen atom is

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-11.6 eV

-12.6 eV

-13.6 eV

-19.6 eV

The transition of inner shell electrons in heavy atoms gives rise to the emission of.

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Low energy b-particle

High energy b-particle

High energy X- rays

High energy gama rays

The gama rays have

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Thin tracks

Thick tracks

No definite tracks

Continuous tracks

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