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

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

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

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600

7000

5000

15000

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

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ECAT Physics Chapter 21 Nuclear Physics Online Test MCQs With Answers

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