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

00:00
Question # 1

Radioactivity

Question # 2

When certain nucleus emits aβ-particles, is mass number:

Question # 3

The half life of radioactive substances depends upon

Question # 4

The counter, which also provides the power to the G.M. tube is called:

Question # 5

Neutron was discovered by

Question # 6

The unit of decay constant is:

Question # 7

Alfa particles are

Question # 8

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

Question # 9

Different radioactive material have

Question # 10

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

Question # 11

Charge on neutron is

Question # 12

An alpha particle has a charge of

Question # 13

Rate of decay is actually described by.

Question # 14

Proton was discovered by Rutherford in

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
2 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
3 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
4 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
5 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
6 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
7 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
8 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
9 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
10 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e

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