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

Phenomenon of radioactivity is due to disintegration of

Question # 2

Rate of decay is actually described by.

Question # 3

Nucleus of a hydrogen atom may contain:

Question # 4

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

Question # 5

Mass of proton is

Question # 6

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

Question # 7

The rate of decay of a radioactive substance

Question # 8

A pair of quark and antiquark makes a:

Question # 9

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

Question # 10

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

Question # 11

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 # 12

An alpha particle has a charge of

Question # 13

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 14

Neon gas have three isotopes whose atomic numbers are

Question # 15

The range of particle depends upon the factor

Question # 16

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

Question # 17

Nucleon means:

Question # 18

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

Question # 19

The figure 1.007276μ shows the mass of an:

Question # 20

Three quarks make:

Question # 21

Neutrons are

Question # 22

The chemical behaviour of an atom is determined by

Question # 23

When certain nucleus emits anα particle, its mass number:

Question # 24

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

Question # 25

Radioactivity is

Question # 26

1 amu is equal to

Question # 27

U-238 present in the natural uranium is about:

Question # 28

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 29

Charge on neutron is

Question # 30

The penetration power ofβ-particle is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
2 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
3 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
4 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
5 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
6 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
7 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
8 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
9 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
10 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas

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