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 chemical properties of an element depends upon the number of

Question # 2

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

Question # 3

A curie represents a very strong source of

Question # 4

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 5

The nucleus/nuclei of hydrogen is/are:

Question # 6

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

Question # 7

1 amu is equal to

Question # 8

Phenomenon of radioactivity is due to disintegration of

Question # 9

Charge on neutron is

Question # 10

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

Question # 11

The rate of decay of a radioactive substance

Question # 12

The number if neutrons in the nucleus of 92U235are

Question # 13

The penetration power ofβ-particle is

Question # 14

After alpha decay the atomic number of the atom

Question # 15

In wilson cloud chamber, the air becomes saturated with:

Question # 16

Beta particles are

Question # 17

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

Question # 18

Neutron was suggested to be in the nucleus by:

Question # 19

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

Question # 20

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

Question # 21

Which of these is not a radiation detector

Question # 22

U-238 present in the natural uranium is about:

Question # 23

Neutron was discovered by

Question # 24

Nucleon means:

Question # 25

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

Question # 26

For Protium, the mass defect is:

Question # 27

The number of protons inside a nucleus is called

Question # 28

The unit of decay constant is:

Question # 29

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium
2 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
3 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
4 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
5 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
6 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932
7 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
8 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
9 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
10 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)

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