ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Question # 1

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

Question # 2

Nucleon means:

Question # 3

Marie curie and Pierre curie discovered:

Question # 4

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

Question # 5

For Protium, the mass defect is:

Question # 6

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 7

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

Question # 8

Radioactivity was discovered by

Question # 9

Alfa particles are

Question # 10

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

Question # 11

The rate of decay of a radioactive substance

Question # 12

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

Question # 13

The number of isotopes of hydrogen are

Question # 14

The isotope/s of hydrogen is /are:

Question # 15

Three quarks make:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 Radioactivity
A. is exhibited more by semiconductors in general
B. in exhibited more by the element when they are coupled
C. with other radioactive elements by a covalent bond
D. is an atomic property of radioactive elements
3 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
4 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
5 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
6 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
7 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
8 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
9 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
10 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

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