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

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 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

Question # 3

Three quarks make:

Question # 4

Which of these is not a radiation detector

Question # 5

Phenomenon of radioactivity is due to disintegration of

Question # 6

The unit of decay constant is:

Question # 7

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 8

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

Question # 9

The number if neutrons in the nucleus of 92U235are

Question # 10

γ-rays are

Question # 11

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

Question # 12

Which of the following material has smaller has life

Question # 13

Marie curie and Pierre curie discovered:

Question # 14

The chemical properties of all the isotopes of an elements are

Question # 15

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

Question # 16

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

Question # 17

In 1932 Chadwick discovered

Question # 18

Mass of neutron is

Question # 19

Neutron was disvovered by:

Question # 20

A pair of quark and antiquark makes a:

Question # 21

Radioactivity

Question # 22

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

Question # 23

The diameter of an atom is of the order

Question # 24

Binding energy per nucleus is

Question # 25

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

Question # 26

The half life of radioactive substances depends upon

Question # 27

The rate of decay of a radioactive substance

Question # 28

Beta particles are

Question # 29

The emission of radiations take place in elements, having charge number greater than

Question # 30

Curie is a unit of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
2 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
3 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
4 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
5 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
6 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
7 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above
8 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
9 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
10 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle

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