ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

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

Question # 2

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

Question # 3

After alpha decay the atomic number of the atom

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

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

Question # 6

Mass of proton is

Question # 7

The unit of decay constant is

Question # 8

Radioactivity was discovered by

Question # 9

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

Question # 10

The half life of radioactive substances depends upon

Question # 11

Which are not the elementary particles?

Question # 12

Nucleus consists of

Question # 13

Charge on neutron is

Question # 14

Marie curie and Pierre curie discovered:

Question # 15

When certain nucleus emits anα particle, its mass number:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
3 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
4 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
5 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
6 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
7 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
8 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
9 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
10 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron

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