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

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Question # 1

Pair production take place when energy ofγ-rays photon is

Question # 2

There is present in paraffin a large amount of:

Question # 3

Radioactivity

Question # 4

The rate of decay of a radioactive substance

Question # 5

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

Question # 6

The most abundant isotope of neon is

Question # 7

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

Question # 8

The number of protons inside a nucleus is called

Question # 9

The half life of radioactive substances depends upon

Question # 10

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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 # 15

The half life of uranium-238 is

Question # 16

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

Question # 17

Mass of proton is of order of

Question # 18

The half lie of radium-226 is

Question # 19

The number if neutrons in the nucleus of 92U235are

Question # 20

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

Question # 21

After alpha decay the atomic number of the atom

Question # 22

Radioactivity is

Question # 23

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

Question # 24

The rate of decay of radioactive substance

Question # 25

Fraction of the decaying atoms per unit time is called

Question # 26

The unit of decay constant is

Question # 27

Marie curie and Pierre curie discovered:

Question # 28

Curie is a unit of

Question # 29

Mass of neutron is

Question # 30

Gamma rays consist of steam of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The energy is found from Einstein's mass energy relation is called
A. binding energy of electron
B. binding energy of proton
C. binding energy of neutron
D. binding energy of nucleus
2 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
3 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
4 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium
5 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
6 The energy acquired by a mass of 1g moving with the speed of light is
A. 3 x 108J
B. 9 x 1013J
C. 3 x 1013J
D. 9 x 1016J
7 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
8 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
9 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
10 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four

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