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

Question # 2

Alfa , beta and gamma rays are emitted from a radio-active substance

Question # 3

The penetration power ofβ-particle is

Question # 4

The figure 1.007276μ shows the mass of an:

Question # 5

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 6

Mass of neutron is

Question # 7

Nucleus of a hydrogen atom may contain:

Question # 8

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 9

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

Question # 10

Radioactivity is

Question # 11

The range of particle depends upon the factor

Question # 12

Which of the following material has smaller has life

Question # 13

Which are not the elementary particles?

Question # 14

Gamma rays consist of steam of

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
2 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
3 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
4 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
5 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
6 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
7 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C
8 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
9 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
10 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these

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