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

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Question # 1

Fraction of the decaying atoms per unit time is called

Question # 2

Radioactivity was discovered by:

Question # 3

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

Question # 4

The penetration power ofβ-particle is

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

U-238 present in the natural uranium is about:

Question # 9

γ-rays behave like a particle because they explain the

Question # 10

Radiation detector are used to

Question # 11

The chemical properties of all the isotopes of an elements are

Question # 12

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

Question # 13

Rutherford performed an experiment on nuclear reactions in:

Question # 14

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

Question # 15

Neutron was discovered by

Question # 16

The unit of decay constant is

Question # 17

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

Question # 18

A curie represents a very strong source of

Question # 19

The number if neutrons in the nucleus of 92U235are

Question # 20

Which of the following material has smaller has life

Question # 21

The diameter of an atom is of the order

Question # 22

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

Question # 23

Nucleon means:

Question # 24

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

Question # 25

The isotope/s of hydrogen is /are:

Question # 26

When certain nucleus emits anα particle, its mass number:

Question # 27

Different radioactive material have

Question # 28

The figure 1.007276μ shows the mass of an:

Question # 29

Gamma rays consist of steam of

Question # 30

Neon gas have three isotopes whose atomic numbers are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
2 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
3 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
4 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
5 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
6 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
7 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
8 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
9 Nucleus of a hydrogen atom may contain:
A. One neutron only
B. Two protons and one neutron
C. Two protons and two neutrons
D. Aany of above
10 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000

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