ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 2

Gamma rays consist of steam of

Question # 3

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 4

Rate of decay is actually described by.

Question # 5

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

Question # 6

Structure of the nucleus was explained by

Question # 7

The chemical properties of all the isotopes of an elements are

Question # 8

The number if neutrons in the nucleus of 92U235are

Question # 9

The figure 1.007276μ shows the mass of an:

Question # 10

Mass of proton is of order of

Question # 11

The unit of decay constant is

Question # 12

Which of the following material has smaller has life

Question # 13

The rate of decay of radioactive substance

Question # 14

γ-rays behave like a particle because they explain the

Question # 15

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 16

Binding energy per nucleus is

Question # 17

A mass spectrograph sort out

Question # 18

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

Question # 19

A curie represents a very strong source of

Question # 20

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 21

How many isotopes of helium are present?

Question # 22

Curie is a unit of

Question # 23

Different radioactive material have

Question # 24

U-238 present in the natural uranium is about:

Question # 25

The chemical properties of an element depends upon the number of

Question # 26

When certain nucleus emits anα particle, its mass number:

Question # 27

The number of isotopes of hydrogen are

Question # 28

A pair of quark and antiquark makes a:

Question # 29

The half life of radioactive substances depends upon

Question # 30

Marie curie and Pierre curie discovered:

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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 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
3 The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
4 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
5 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
6 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
7 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
8 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
9 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
10 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'

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