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

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

Question # 2

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 3

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

Question # 4

There is present in paraffin a large amount of:

Question # 5

U-238 present in the natural uranium is about:

Question # 6

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

Question # 7

The unit of decay constant is

Question # 8

The number of protons inside a nucleus is called

Question # 9

In wilson cloud chamber, the air becomes saturated with:

Question # 10

The chemical behaviour of an atom is determined by

Question # 11

γ-rays behave like a particle because they explain the

Question # 12

Radioactivity was discovered by:

Question # 13

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

Question # 14

Three quarks make:

Question # 15

Neutron was discovered in

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ECAT Class Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
2 Radioactivity
A. is exhibited more by semiconductors in general
B. in exhibited more by the element when they are coupled
C. with other radioactive elements by a covalent bond
D. is an atomic property of radioactive elements
3 The half life of radioactive substances depends upon
A. amount of substance
B. energy of substance
C. state of substance
D. temperature of substance
4 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C
5 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
6 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
7 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
8 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
9 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
10 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)

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