ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

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

Question # 2

Phenomenon of radioactivity is due to disintegration of

Question # 3

Beta particles are

Question # 4

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 5

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

Question # 6

A mass spectrograph sort out

Question # 7

The chemical behaviour of an atom is determined by

Question # 8

Curie is a unit of

Question # 9

Neutron was disvovered by:

Question # 10

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

Question # 11

Electrons are

Question # 12

The range ofβ-particle in air is greater than that ofα-particle by

Question # 13

In 1932 Chadwick discovered

Question # 14

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

Question # 15

The time required for a radioactive material to decrease in active by one half is called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
2 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
3 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
4 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
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 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
7 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
8 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
9 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
10 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance

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