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

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 2

γ-rays behave like a particle because they explain the

Question # 3

An alpha particle has a charge of

Question # 4

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 # 5

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

Question # 6

The unit of decay constant is

Question # 7

The number of isotopes of hydrogen are

Question # 8

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 9

Charge on neutron is

Question # 10

The half life of uranium-238 is

Question # 11

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

Question # 12

A pair of quark and antiquark makes a:

Question # 13

Nucleon means:

Question # 14

Three quarks make:

Question # 15

Charge on proton is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
2 The nucleus left after the emission of some radiation is called:
A. Parent nucleus
B. Daughter necleus
C. Mother necleus
D. Any of these
3 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
4 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
5 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
6 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
7 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
8 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
9 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
10 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life

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