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

00:00
Question # 1

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 2

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

Question # 3

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

Question # 4

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 5

Three quarks make:

Question # 6

The rate of decay of a radioactive substance

Question # 7

When certain nucleus emits anα particle, its mass number:

Question # 8

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 9

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

Question # 10

Structure of the nucleus was explained by

Question # 11

The reciprocal of decay constant λ of a radioactive material is:

Question # 12

Radioactivity is

Question # 13

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 14

Neutrons are

Question # 15

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

Question # 16

The total charge of any nucleus is given as

Question # 17

A particle having the mass of electron and charge of a proton is called a

Question # 18

Curie is a unit of

Question # 19

Radium was discovered by:

Question # 20

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

Question # 21

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 22

The most abundant isotope of neon is

Question # 23

Nucleus of a hydrogen atom may contain:

Question # 24

The isotope/s of hydrogen is /are:

Question # 25

Radioactivity was discovered by

Question # 26

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 27

Radiation detector are used to

Question # 28

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

Question # 29

The number if neutrons in the nucleus of 92U235are

Question # 30

Charge on proton is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
2 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
3 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
4 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
5 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
6 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
7 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
8 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
9 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
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
10 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these

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