ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

The penetration power ofβ-particle is

Question # 2

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 3

The diameter of an atom is of the order

Question # 4

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

Question # 5

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 6

Fraction of the decaying atoms per unit time is called

Question # 7

The unit of decay constant is:

Question # 8

Which of the following material has smaller has life

Question # 9

For Protium, the mass defect is:

Question # 10

In 1932 Chadwick discovered

Question # 11

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

Question # 12

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 13

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

Question # 14

Charge on neutron is

Question # 15

Radioactivity was discovered by:

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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 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
3 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
4 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
5 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
6 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
7 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
8 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
9 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
10 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons

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