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

Radioactivity is

Question # 2

After alpha decay the atomic number of the atom

Question # 3

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

Question # 4

Pair production take place when energy ofγ-rays photon is

Question # 5

The range of particle depends upon the factor

Question # 6

An alpha particle has a charge of

Question # 7

The nucleus/nuclei of hydrogen is/are:

Question # 8

Nucleus consists of

Question # 9

Which of the following material has smaller has life

Question # 10

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 11

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

Question # 12

When thorium nucleus emits aβ-particle, the daughter 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 figure 1.007276μ shows the mass of an:

Question # 15

When certain nucleus emits anα particle, its mass number:

Question # 16

Neon gas have three isotopes whose atomic numbers are

Question # 17

Neutron was discovered by

Question # 18

Which are not the elementary particles?

Question # 19

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

Question # 20

A mass spectrograph sort out

Question # 21

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

Question # 22

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

Question # 23

Phenomenon of radioactivity is due to disintegration of

Question # 24

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

Question # 25

The chemical properties of all the isotopes of an elements are

Question # 26

The amount of energy equivalent to 1 a.m.u is

Question # 27

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

Question # 28

The rate of decay of a radioactive substance

Question # 29

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

Question # 30

γ-rays behave like a particle because they explain the

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
2 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
3 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
4 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
5 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
6 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
7 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
8 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
9 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
10 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932

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