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

Nucleus consists of

Question # 2

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

Question # 3

The range ofβ-particle in air is greater than that ofα-particle by

Question # 4

A curie represents a very strong source of

Question # 5

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

Question # 6

Electrons are

Question # 7

The total charge of any nucleus is given as

Question # 8

A mass spectrograph sort out

Question # 9

The unit of decay constant is:

Question # 10

Fraction of the decaying atoms per unit time is called

Question # 11

Phenomenon of radioactivity is due to disintegration of

Question # 12

The number of protons inside a nucleus is called

Question # 13

The nucleus/nuclei of hydrogen is/are:

Question # 14

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
2 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
3 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
8 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
9 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932
10 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas

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