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

Neutron was suggested to be in the nucleus by:

Question # 2

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

Question # 3

Which are not the elementary particles?

Question # 4

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

Question # 5

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 6

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

Question # 7

The unit of decay constant is

Question # 8

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

Question # 9

Radiation detector are used to

Question # 10

γ-rays are

Question # 11

Three quarks make:

Question # 12

The energy is found from Einstein's mass energy relation is called

Question # 13

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

Question # 14

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

Question # 15

Neutron was discovered in

Question # 16

Electrons are

Question # 17

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

Question # 18

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

Question # 19

The penetration power ofβ-particle is

Question # 20

1 amu is equal to.

Question # 21

Neutrons are

Question # 22

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

Question # 23

The isotope/s of hydrogen is /are:

Question # 24

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

Question # 25

Charge on neutron is

Question # 26

Which of these is not a radiation detector

Question # 27

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

Question # 28

Curie is a unit of

Question # 29

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

Question # 30

After alpha decay the atomic number of the atom

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
2 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
3 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
4 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
5 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
6 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
7 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
8 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
9 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
10 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric

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