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

β-particles are easily deflected by collisions than heavy

Question # 2

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 3

Gamma rays consist of steam of

Question # 4

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

Question # 5

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

Question # 6

The rate of decay of radioactive substance

Question # 7

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

Question # 8

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

Question # 9

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 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

Question # 11

After alpha decay the atomic number of the atom

Question # 12

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

Question # 13

A mass spectrograph sort out

Question # 14

Radiation detector are used to

Question # 15

The half life of radioactive substances depends upon

Question # 16

The nucleus/nuclei of hydrogen is/are:

Question # 17

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

Question # 18

Fraction of the decaying atoms per unit time is called

Question # 19

When certain nucleus emits anα particle, its mass number:

Question # 20

Electrons are

Question # 21

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

Question # 22

Binding energy per nucleus is

Question # 23

The half life of uranium-238 is

Question # 24

Mass of neutron is

Question # 25

Mass of proton is of order of

Question # 26

There is present in paraffin a large amount of:

Question # 27

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

Question # 28

Rutherford performed an experiment on nuclear reactions in:

Question # 29

Different radioactive material have

Question # 30

1 amu is equal to.

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
2 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
3 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
4 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
5 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
8 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
9 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
10 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium

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