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 rate of decay of radioactive substance

Question # 2

The energy acquired by a mass of 1g moving with the speed of light is

Question # 3

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 4

In radio-active decay, the original element which disintegrate to another element is called

Question # 5

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

Question # 6

Gamma rays consist of steam of

Question # 7

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

Question # 8

Radioactivity

Question # 9

The total charge of any nucleus is given as

Question # 10

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

Question # 11

The nucleus/nuclei of hydrogen is/are:

Question # 12

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

Question # 13

Charge on proton is

Question # 14

Pair production take place when energy ofγ-rays photon is

Question # 15

The half life of radioactive substances depends upon

Question # 16

After alpha decay the atomic number of the atom

Question # 17

A pair of quark and antiquark makes a:

Question # 18

Mass of proton is

Question # 19

For Protium, the mass defect is:

Question # 20

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

Question # 21

Rate of decay is actually described by.

Question # 22

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

Question # 23

The unit of decay constant is:

Question # 24

Nucleus consists of

Question # 25

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

Question # 26

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

Question # 27

1 amu is equal to.

Question # 28

The range ofβ-particle in air is greater than that ofα-particle by

Question # 29

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

Question # 30

The penetration power ofβ-particle is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
2 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
3 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
4 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
5 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
6 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
7 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above
8 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
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 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule

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