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

Question # 2

In wilson cloud chamber, the air becomes saturated with:

Question # 3

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

Question # 4

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

Question # 5

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

Question # 6

Radioactivity

Question # 7

Neutron was discovered in

Question # 8

An alpha particle has a charge of

Question # 9

The rate of decay of a radioactive substance

Question # 10

A curie represents a very strong source of

Question # 11

Nucleus of a hydrogen atom may contain:

Question # 12

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

Question # 13

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

Question # 14

The most abundant isotope of neon is

Question # 15

Phenomenon of radioactivity is due to disintegration of

Question # 16

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

Question # 17

Neutron was disvovered by:

Question # 18

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

Question # 19

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

Question # 20

The diameter of an atom is of the order

Question # 21

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

Question # 22

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 # 23

Which of the following material has longer half life

Question # 24

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

Question # 25

Fraction of the decaying atoms per unit time is called

Question # 26

The time required for a radioactive material to decrease in active by one half is called

Question # 27

The rate of decay of radioactive substance

Question # 28

The emission of radiations take place in elements, having charge number greater than

Question # 29

Rate of decay is actually described by.

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
2 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
3 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
4 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
5 When a charged particle passes through matter, it produces ionization, this effect is used in
A. fission reaction
B. reactor
C. radiation detector
D. fusion reaction
6 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
7 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
8 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
9 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
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
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity

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