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

A mass spectrograph sort out

Question # 2

Neutron was discovered by

Question # 3

Radium was discovered by:

Question # 4

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

Question # 5

Marie curie and Pierre curie discovered:

Question # 6

Radioactivity

Question # 7

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 8

Which of the following material has longer half life

Question # 9

Nucleus of a hydrogen atom may contain:

Question # 10

Which are not the elementary particles?

Question # 11

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

Question # 12

Alfa particles are

Question # 13

Radioactivity was discovered by:

Question # 14

The emission of radiations take place in elements, having charge number greater than

Question # 15

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

Question # 16

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

Question # 17

Nucleus consists of

Question # 18

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

Question # 19

The half life of uranium-238 is

Question # 20

After alpha decay the atomic number of the atom

Question # 21

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

Question # 22

The rate of decay of a radioactive substance

Question # 23

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

Question # 24

Binding energy per nucleus is

Question # 25

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

Question # 26

Neon gas have three isotopes whose atomic numbers are

Question # 27

The unit of decay constant is:

Question # 28

Electrons are

Question # 29

Neutron was discovered in

Question # 30

γ-rays are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
2 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
3 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
4 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
5 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
6 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
7 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
8 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
9 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
10 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

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