ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

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

Question # 2

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

Question # 3

Structure of the nucleus was explained by

Question # 4

The chemical behaviour of an atom is determined by

Question # 5

For Protium, the mass defect is:

Question # 6

Mass of neutron is

Question # 7

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

Question # 8

γ-rays are

Question # 9

According to Rutherford atomic model, the positive charge in an atom

Question # 10

The range ofβ-particle in air is greater than that ofα-particle by

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

Mass of proton is

Question # 13

There is present in paraffin a large amount of:

Question # 14

The unit of decay constant is:

Question # 15

Neon gas have three isotopes whose atomic numbers are

Question # 16

Gamma rays consist of steam of

Question # 17

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

Question # 18

The nucleus left after the emission of some radiation is called:

Question # 19

How many isotopes of helium are present?

Question # 20

The amount of energy equivalent to 1 a.m.u is

Question # 21

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

Question # 22

Which of the following material has longer half life

Question # 23

The chemical properties of all the isotopes of an elements are

Question # 24

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

Question # 25

Radioactivity is

Question # 26

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

Question # 27

The unit of decay constant is

Question # 28

γ-rays behave like a particle because they explain the

Question # 29

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

Question # 30

U-238 present in the natural uranium is about:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
2 Rutherford performed an experiment on nuclear reactions in:
A. 1718 A.D
B. 1818 A.D
C. 1918 A.D
D. 2001 A.D.
3 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
4 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
5 Which of these is not a radiation detector
A. Wilson cloud chamber
B. cyclotron acceleration
C. Geiger Miller counter
D. solid state detector
6 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
7 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
8 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
9 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
10 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian

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