ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

Question # 2

Structure of the nucleus was explained by

Question # 3

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

Question # 4

A curie represents a very strong source of

Question # 5

The rate of decay of a radioactive substance

Question # 6

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 7

Charge on proton is

Question # 8

The number of protons inside a nucleus is called

Question # 9

When a nucleus emits an alpha particles, its charge number decreases by

Question # 10

Rate of decay is actually described by.

Question # 11

Radioactivity is

Question # 12

The rate of decay of radioactive substance

Question # 13

Neutron was discovered by

Question # 14

Beta particles are

Question # 15

The figure 1.007276μ shows the mass of an:

Question # 16

Proton was discovered by Rutherford in

Question # 17

Neutron was discovered in

Question # 18

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 19

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 20

After alpha decay the atomic number of the atom

Question # 21

In wilson cloud chamber, the air becomes saturated with:

Question # 22

When certain nucleus emits aβ-particles, is mass number:

Question # 23

The half lie of radium-226 is

Question # 24

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

Question # 25

The nucleus/nuclei of hydrogen is/are:

Question # 26

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 27

The chemical properties of all the isotopes of an elements are

Question # 28

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

Question # 29

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
2 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
3 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
4 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
5 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
6 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
7 In his experiment on nuclear reactions, Rutherford bombardedα particles on:
A. Nitrogen
B. Hydrogen
C. Lead
D. Oxygen
8 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
9 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
10 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4

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