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

Radioactivity was discovered by

Question # 2

The rate of decay of radioactive substance

Question # 3

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

Question # 4

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 5

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

Question # 6

Radioactivity was discovered by:

Question # 7

The number if neutrons in the nucleus of 92U235are

Question # 8

In radio-active decay, the original element which disintegrate to another element is called

Question # 9

Which of the following material has longer half life

Question # 10

The unit of decay constant is

Question # 11

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

Question # 12

After alpha decay the atomic number of the atom

Question # 13

The diameter of an atom is of the order

Question # 14

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 15

The chemical behaviour of an atom is determined by

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z
2 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
3 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
4 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
5 Nucleon means:
A. Only electrons
B. Only neutrons
C. Only protons
D. Both (A ) and (C)
6 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
7 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
8 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
9 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above
10 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these

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