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

Charge on neutron is

Question # 2

A particle having the mass of electron and charge of a proton is called a

Question # 3

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

Question # 4

Examples of moderators used in a fission reactor is/are:

Question # 5

An alpha particle has a charge of

Question # 6

The number of all the protons and neutrons in a nucleus is known as

Question # 7

Mass of neutron is

Question # 8

After alpha decay the atomic number of the atom

Question # 9

Radioactivity is

Question # 10

The energy is found from Einstein's mass energy relation is called

Question # 11

Neon gas have three isotopes whose atomic numbers are

Question # 12

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

Question # 13

In radio-active decay, the original element which disintegrate to another element is called

Question # 14

The half life of radioactive substances depends upon

Question # 15

Pair production take place when energy ofγ-rays photon is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
2 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
3 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
4 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
5 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
6 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
7 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
8 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
9 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
10 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
A. polonium uranium
B. uranium and radium
C. polonium and radium
D. none of these

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