ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

Try The 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

Phenomenon of radioactivity is due to disintegration of

Question # 2

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 3

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 4

1 amu is equal to

Question # 5

Three quarks make:

Question # 6

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

Question # 7

γ-rays behave like a particle because they explain the

Question # 8

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 9

The range of particle depends upon the factor

Question # 10

The unit of decay constant is:

Question # 11

Nuclei that have the same charge number but different mass number are called

Question # 12

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 13

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

Question # 14

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

Question # 15

After alpha decay the atomic number of the atom

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
3 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
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 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z
6 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
7 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
8 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
9 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
10 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas

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