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

When a nucleus emits an alpha particles, its charge number decreases by

Question # 2

Neutrons are

Question # 3

Mass of proton is of order of

Question # 4

Neutron was suggested to be in the nucleus by:

Question # 5

In wilson cloud chamber, the air becomes saturated with:

Question # 6

According to Rutherford atomic model, the positive charge in an atom

Question # 7

Radioactivity

Question # 8

The figure 1.007276μ shows the mass of an:

Question # 9

Different radioactive material have

Question # 10

The energy acquired by a mass of 1g moving with the speed of light is

Question # 11

The half lie of radium-226 is

Question # 12

Which are not the elementary particles?

Question # 13

The half life of uranium-238 is

Question # 14

Structure of the nucleus was explained by

Question # 15

The emission of radiations take place in elements, having charge number greater than

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
2 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
3 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
4 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
5 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
6 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
7 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
8 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
9 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
10 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years

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