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

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

Question # 2

U-238 present in the natural uranium is about:

Question # 3

The rate of decay of a radioactive substance

Question # 4

How many isotopes of helium are present?

Question # 5

In wilson cloud chamber, the air becomes saturated with:

Question # 6

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

Question # 7

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

Question # 8

Proton was discovered by Rutherford in

Question # 9

Mass of neutron is

Question # 10

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

Question # 11

Mass of proton is

Question # 12

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

Question # 13

How much time, theα-particle more massive than an electron

Question # 14

γ-rays are

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
2 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
3 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
4 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
5 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
6 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
7 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
8 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
9 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
10 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon

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