ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

Try The 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

Nucleus of a hydrogen atom may contain:

Question # 2

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

Question # 3

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

Question # 4

Which of these is not a radiation detector

Question # 5

The chemical behaviour of an atom is determined by

Question # 6

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

Question # 7

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

Question # 8

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

Question # 9

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

Question # 10

The diameter of an atom is of the order

Question # 11

Proton was discovered by Rutherford in

Question # 12

Phenomenon of radioactivity is due to disintegration of

Question # 13

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

Question # 14

Fraction of the decaying atoms per unit time is called

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 a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
2 When a charged particle passes through matter, it produces ionization, this effect is used in
A. fission reaction
B. reactor
C. radiation detector
D. fusion reaction
3 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
4 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
5 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
6 The nucleus left after the emission of some radiation is called:
A. Parent nucleus
B. Daughter necleus
C. Mother necleus
D. Any of these
7 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C
8 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
9 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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