ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Question # 1

Binding energy per nucleus is

Question # 2

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

Question # 3

Neutron was disvovered by:

Question # 4

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

Question # 5

Radioactivity was discovered by

Question # 6

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 7

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

Question # 8

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

Question # 9

After alpha decay the atomic number of the atom

Question # 10

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

Question # 11

Mass of neutron is

Question # 12

The figure 1.007276μ shows the mass of an:

Question # 13

β-particles are easily deflected by collisions than heavy

Question # 14

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

Question # 15

Which of the following material has smaller has life

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
2 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
3 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
4 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
5 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
6 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
7 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
8 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
9 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas
10 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200

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