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

Neutrons are

Question # 2

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 3

The time required for a radioactive material to decrease in active by one half is called

Question # 4

Which of the following material has longer half life

Question # 5

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

Question # 6

For Protium, the mass defect is:

Question # 7

Which of the following material has smaller has life

Question # 8

How many isotopes of helium are present?

Question # 9

The nucleus left after the emission of some radiation is called:

Question # 10

Nucleus consists of

Question # 11

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 12

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

Question # 13

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 14

Mass of proton is of order of

Question # 15

When certain nucleus emits anα particle, its mass number:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
2 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
3 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
4 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
5 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
6 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
7 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
8 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A
9 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
10 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral

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