ECAT Pre General Science Chapter 21 online mcq test with answers for Physics chapter 21 (Nuclear Physics)

Question # 1

The isotope/s of hydrogen is /are:

Protium A
Deuterium B
Tritium C
Both (A) and (B) D
All of these E

Question # 2

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

Isobars A
Isotopes B
Isomers C
Isobaric D
Isothermal E

Question # 3

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

deuteron A
deterium B
protium C
tritium D

Question # 4

Heavy water is made of one oxygen atom and two atoms of:

Protium A
Deuterium B
Tritium C
Any of these D
None of these E

Question # 5

A curie represents a very strong source of

α-particle A
β-particle B
γ-particle C
none of these D

Question # 6

Rate of decay is actually described by.

Half line A
Decay constant B
Mean life C
Total life D
None of these E

Question # 7

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

-4 A
4 B
2 C
1 D

Question # 8

Which of the following material has smaller has life

uranium A
polonium B
radium C
radian D

Question # 9

In wilson cloud chamber, the air becomes saturated with:

Alcohol vapours A
Water B
Helium gas C
Nitrogen gas D
None of these E

Question # 10

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Nitrogen A
Hydrogen B
Lead C
Oxygen D
Krypton E

Question # 11

Radiation detector are used to

measure intensity of radiation A
measure energy of radiation B
difference between different types of radiation C
all the above D

Question # 12

Structure of the nucleus was explained by

J.J Thomson A
Bohr B
Millikan C
Rutherford D

Question # 13

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

3 A
2 B
6 C
5 D

Question # 14

Three quarks make:

An electron A
A meson B
A baryon C
A photon D
None of these E

Question # 15

Mass of neutron is

1.67 x 10^-31kg A
1.67 x 10^-27kg B
9.1 x 10^-31kg C
1.67 x 10^-19kg D

Question # 16

The diameter of an atom is of the order

10^-125m A
10^-11m B
10^-10m C
10^-9m D

Question # 17

Nuclei that have the same charge number but different mass number are called

isotones A
isomers B
isotopes C
isobars D

Question # 18

The energy acquired by a mass of 1g moving with the speed of light is

3 x 10⁸J A
9 x 10¹³J B
3 x 10¹³J C
9 x 10¹⁶J D

Question # 19

Which are not the elementary particles?

Photons A
Leptons B
Hadrons C
Quarks D
None of these E

Question # 20

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

Remain same A
Increases by one B
Decreases by one C
Decreases by four D
None of these E

Question # 21

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

element A
daughter element B
parent element C
none of these D

Question # 22

Radium was discovered by:

Becquerel A
Marie curie B
Pierre curie C
Rutherford D
Both (B) and (C) E

Question # 23

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

Charge A
energy B
Momentum C
Mass D
All of these E

Question # 24

The chemical properties of all the isotopes of an elements are

same A
different B
slightly different C
none of these D

Question # 25

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

A - Z A
A + Z B
Z C
A D

Question # 26

Neon gas have three isotopes whose atomic numbers are

20, 24 , 23 A
20, 21 , 22 B
20, 19 , 21 C
none of these D

Question # 27

Gamma rays consist of steam of

electron A
proton B
photons C
all of these D

Question # 28

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

half time A
half life B
disintegration time C
mean life D

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

Equal to 1 A
Less than 1 B
Greater than 1 C
Infinity D

Question # 30

Radioactivity is

self disruptive activity A
spontaneous activity B
exhibited by all elements under proper conditions C
both 'a' and 'b' D

Sr.#	Question	Answer
1	Radiation detector are used to	A. measure intensity of radiation B. measure energy of radiation C. difference between different types of radiation D. all the above
2	A curie represents a very strong source of	A. α-particle B. β-particle C. γ-particle D. none of these
3	In his experiment on nuclear reactions, Rutherford bombardedα particles on:	A. Nitrogen B. Hydrogen C. Lead D. Oxygen
4	The chemical behaviour of an atom is determined by	A. binding energy B. atomic number C. mass number D. number of isotopes
5	Neutron was suggested to be in the nucleus by:	A. Rutherford in 1920 B. Bohar in 1913 C. Dirac in 1928 D. Anderson in 1932
6	Which of these is not a radiation detector	A. Wilson cloud chamber B. cyclotron acceleration C. Geiger Miller counter D. solid state detector
7	The chemical properties of all the isotopes of an elements are	A. same B. different C. slightly different D. none of these
8	When a nucleus emits an alpha particles, its charge number decreases by	A. 3 B. 2 C. 6 D. 5
9	In wilson cloud chamber, the air becomes saturated with:	A. Alcohol vapours B. Water C. Helium gas D. Nitrogen gas
10	In radioactive decay, the new element which is formed due to the disintegration of original element is called	A. element B. daughter element C. parent element D. none of these

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ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

ECAT Pre General Science Physics Chapter 21 Nuclear Physics