Question # 1

In the experiment of production of X rays electrons are accelerated towards the anode by

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Thermionic emission

Potential difference

Breaking potential

Cut of current

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

The half life of a radioactive substance as compared to its mean lif eis.

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30%

50%

70%

90%

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

If an object moves with velocity of light the apparent mass of the object as compared to list original mass is

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greater

Smaller

Same

zero

What is the scale for measurement of Banbridge mass spectrograph.

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Linear

Inverse

Exponential

Logarithmic

In radiotherapy X-rays are used to.

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Treat cancer

Delect bone fracture

Cure heart diseasee

All of the above

Which of the following is required for maintaining sustained chain reaction.

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Neutrons

Protons

Electrons

Photons

The scientific theory concerning the coming into existence of universe.

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Cosmology

Cosmogony

Cosmography

Cosmos

In an electronic transition atom cannot emit

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Gama rays

Visible rays

Infrared rays

Ultraviolet rays

What is the effect of electric and magnetic fields on X-rays

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X-rays are deflected

X-rays are not deflected

X-rays are sometimes deflected and sometimes not

Nothing can be said

When objects placed in a room are exposed to X- rays they appear

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Violet

Visible

Red

Invisible

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

In the fusion process, there are

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Hydrogen isotopes

Helium Isotopes

Carbon isotopes

Oxygen isotopes

Mean life of a radioactive sample is 100 s its half life will be

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0.693 s

1 s

6.93 s

69.3 s

Beta decay may occur by

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Beta minus

Beta Plus

Electron capture

All of these

48 days after the receipt the amount of iodine -131 left behind is only.

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0.1325 g

0.2135 g

0.3125 g

0.1235 g

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

The rest mass of a particle is independent of the

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Wavelength of the particle

Mass of the particle

Speed of the particle

Energy of the particle

The wavelength of Lyman series for hydrogen spectrum lies in the.

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Visible region

Ultraviolet region

Infrared region

Far infrared region

A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is

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Inductor

Metal detector

Diode

Operational amplifier

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