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

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

Question # 2

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

Question # 3

γ-rays behave like a particle because they explain the

Question # 4

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

Question # 5

Beta particles are

Question # 6

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

Question # 7

After alpha decay the atomic number of the atom

Question # 8

How many isotopes of helium are present?

Question # 9

The total charge of any nucleus is given as

Question # 10

Rate of decay is actually described by.

Question # 11

1 amu is equal to

Question # 12

Structure of the nucleus was explained by

Question # 13

The rate of decay of a radioactive substance

Question # 14

Gamma rays consist of steam of

Question # 15

The figure 1.007276μ shows the mass of an:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
2 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
3 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
4 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
5 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
6 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
7 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
8 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
9 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
10 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay

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