ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

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

Question # 2

Different radioactive material have

Question # 3

The diameter of an atom is of the order

Question # 4

Three quarks make:

Question # 5

The number of isotopes of hydrogen are

Question # 6

Neutron was discovered by

Question # 7

The rate of decay of radioactive substance

Question # 8

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

Question # 9

The unit of decay constant is

Question # 10

When certain nucleus emits aβ-particles, is mass number:

Question # 11

Heavy water is made of one oxygen atom and two atoms of:

Question # 12

The number of protons inside a nucleus is called

Question # 13

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

Question # 14

The number if neutrons in the nucleus of 92U235are

Question # 15

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

Question # 16

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

Question # 17

The chemical properties of all the isotopes of an elements are

Question # 18

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

Question # 19

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 20

Electrons are

Question # 21

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 22

1 amu is equal to.

Question # 23

There is present in paraffin a large amount of:

Question # 24

Alfa particles are

Question # 25

β-particles are easily deflected by collisions than heavy

Question # 26

γ-rays are

Question # 27

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

Question # 28

Rate of decay is actually described by.

Question # 29

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
2 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
3 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
4 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
5 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons
6 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
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 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
9 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
10 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these

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