Question # 1

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

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