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

00:00
Question # 1

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

Question # 2

An alpha particle has a charge of

Question # 3

Proton was discovered by Rutherford in

Question # 4

The rate of decay of a radioactive substance

Question # 5

Nucleon means:

Question # 6

Different radioactive material have

Question # 7

Charge on neutron is

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

Phenomenon of radioactivity is due to disintegration of

Question # 12

Fraction of the decaying atoms per unit time is called

Question # 13

The unit of decay constant is

Question # 14

The half life of radioactive substances depends upon

Question # 15

Radioactivity is

Question # 16

Radioactivity was discovered by

Question # 17

In 1932 Chadwick discovered

Question # 18

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 19

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

Question # 20

The number if neutrons in the nucleus of 92U235are

Question # 21

Rate of decay is actually described by.

Question # 22

Rutherford performed an experiment on nuclear reactions in:

Question # 23

U-238 present in the natural uranium is about:

Question # 24

A particle having the mass of electron and charge of a proton is called a

Question # 25

The most abundant isotope of neon is

Question # 26

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

Question # 27

Nucleus consists of

Question # 28

Neutron was suggested to be in the nucleus by:

Question # 29

The diameter of an atom is of the order

Question # 30

The rate of decay of radioactive substance

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
2 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
3 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
4 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
5 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
6 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
7 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
8 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
9 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
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
10 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)

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