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

Mass of proton is of order of

Question # 2

For Protium, the mass defect is:

Question # 3

Structure of the nucleus was explained by

Question # 4

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

Question # 5

The chemical properties of an element depends upon the number of

Question # 6

Alfa particles are

Question # 7

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 8

Nucleus of a hydrogen atom may contain:

Question # 9

The penetration power ofβ-particle is

Question # 10

Fraction of the decaying atoms per unit time is called

Question # 11

Neon gas have three isotopes whose atomic numbers are

Question # 12

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

Question # 13

Neutron was suggested to be in the nucleus by:

Question # 14

Three quarks make:

Question # 15

γ-rays behave like a particle because they explain the

Question # 16

Charge on neutron is

Question # 17

1 amu is equal to

Question # 18

Which of the following material has longer half life

Question # 19

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 20

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 # 21

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 22

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

Question # 23

Radioactivity was discovered by:

Question # 24

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

Question # 25

β-particles are easily deflected by collisions than heavy

Question # 26

Which of the following material has smaller has life

Question # 27

Binding energy per nucleus is

Question # 28

Nucleon means:

Question # 29

The counter, which also provides the power to the G.M. tube is called:

Question # 30

Marie curie and Pierre curie discovered:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
2 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
3 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
4 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
5 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
6 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
7 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
8 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
9 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
10 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg

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