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

The total charge of any nucleus is given as

Question # 2

Neutron was suggested to be in the nucleus by:

Question # 3

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

Question # 4

1 amu is equal to

Question # 5

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

Question # 6

Radioactivity is

Question # 7

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

Question # 8

Nucleus consists of

Question # 9

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

Question # 10

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

Question # 11

β-particles are easily deflected by collisions than heavy

Question # 12

Proton was discovered by Rutherford in

Question # 13

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

Question # 14

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

Question # 15

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

Question # 16

The number of isotopes of hydrogen are

Question # 17

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 18

Radiation detector are used to

Question # 19

The half life of uranium-238 is

Question # 20

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

Question # 21

For Protium, the mass defect is:

Question # 22

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

Question # 23

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

Question # 24

Heavy water is made of one oxygen atom and two atoms of:

Question # 25

The chemical properties of an element depends upon the number of

Question # 26

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

Question # 27

Which of the following material has smaller has life

Question # 28

The diameter of an atom is of the order

Question # 29

Radioactivity was discovered by

Question # 30

Neutron was discovered by

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
3 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
4 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
5 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
6 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
7 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
8 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
9 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
10 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

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