ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 2

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

Question # 3

Different radioactive material have

Question # 4

Radioactivity is

Question # 5

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

Question # 6

Fraction of the decaying atoms per unit time is called

Question # 7

Neon gas have three isotopes whose atomic numbers are

Question # 8

The half life of uranium-238 is

Question # 9

Nucleus consists of

Question # 10

β-particles are easily deflected by collisions than heavy

Question # 11

The nucleus/nuclei of hydrogen is/are:

Question # 12

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

Question # 13

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

Question # 14

The rate of decay of radioactive substance

Question # 15

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

Question # 16

How many isotopes of helium are present?

Question # 17

Structure of the nucleus was explained by

Question # 18

An alpha particle has a charge of

Question # 19

Alfa particles are

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

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

Question # 24

When certain nucleus emits anα particle, its mass number:

Question # 25

The half life of radioactive substances depends upon

Question # 26

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 # 27

Mass of proton is of order of

Question # 28

The number of isotopes of hydrogen are

Question # 29

Proton was discovered by Rutherford in

Question # 30

Gamma rays consist of steam of

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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 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
3 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
4 Neutron was discovered in
A. 1915
B. 1920
C. 1925
D. 1932
5 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
6 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
7 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
8 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron
9 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
10 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e

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