Question # 1

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

Which is true for both alpha particle and gama rays.

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They cause ionization in air

They can be deflected by electric field

They can be deflected by magnetic field

The y can penetrate a few millimeters of aluminium

The background radiation to which we are exposed, on the average is.

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1 mSv per year

2 mSv per year

3 mSv per year

4 mSv per year

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

The reactance of inductor depends upon

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L

All of the above

Magnetic effect of current is used in.

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Toaster

Electric iron

Electric motor

D.C. Battery

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

The value of capacitive reactance is given by

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Xc = VI

All of above

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

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Current

Power

Voltage

Direction of winding

Both Xenon and cesium have

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33 isotopes

34 Isotopes

36 Isotopes

35 Isotopes

SI unit of electric flux is.

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NmC¹

Nm^-1 C¹

Nm²C^-1

Nm³C²

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

A solid having regular arrangement of molecules throughout its structure is called.

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Amorphous solid

Polymeric solid

Crystalline solid

Glassy solid

If the distance between two charges is halved and charges are also doubled, then force between them will be.

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Two time

Four time

Eight time

Sixteen time

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

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