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

Question # 2

The amount of energy equivalent to 1 a.m.u is

Question # 3

Nucleus of a hydrogen atom may contain:

Question # 4

β-particles are easily deflected by collisions than heavy

Question # 5

The energy is found from Einstein's mass energy relation is called

Question # 6

Marie curie and Pierre curie discovered:

Question # 7

Three quarks make:

Question # 8

How many isotopes of helium are present?

Question # 9

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

Question # 10

The rate of decay of a radioactive substance

Question # 11

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

Question # 12

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 13

The number of isotopes of hydrogen are

Question # 14

When certain nucleus emits anα particle, its mass number:

Question # 15

A pair of quark and antiquark makes a:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
2 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
3 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
6 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
7 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
8 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
9 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
10 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford

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