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

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

Question # 2

The chemical behaviour of an atom is determined by

Question # 3

The unit of decay constant is:

Question # 4

Neutron was discovered in

Question # 5

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 6

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

Question # 7

U-238 present in the natural uranium is about:

Question # 8

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 9

Different radioactive material have

Question # 10

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 11

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

Question # 12

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 # 13

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

Question # 14

Three quarks make:

Question # 15

Which of these is not a radiation detector

Question # 16

Neutrons are

Question # 17

Proton was discovered by Rutherford in

Question # 18

Curie is a unit of

Question # 19

According to Rutherford atomic model, the positive charge in an atom

Question # 20

Binding energy per nucleus is

Question # 21

The chemical properties of an element depends upon the number of

Question # 22

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

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

Charge on proton is

Question # 27

Structure of the nucleus was explained by

Question # 28

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

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
2 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
3 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
4 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
5 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
8 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
9 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
10 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance

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