ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

Try The 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

Neutrons are

Question # 2

The total charge of any nucleus is given as

Question # 3

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

Question # 4

Binding energy per nucleus is

Question # 5

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

Question # 6

A curie represents a very strong source of

Question # 7

How many isotopes of helium are present?

Question # 8

The chemical properties of an element depends upon the number of

Question # 9

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 10

The rate of decay of a radioactive substance

Question # 11

How much time, theα-particle more massive than an electron

Question # 12

Alfa particles are

Question # 13

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 14

When a nucleus emits an alpha particles, its charge number decreases by

Question # 15

Fraction of the decaying atoms per unit time is called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
2 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
3 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
4 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
5 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
6 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
7 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
8 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
9 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C
10 A pair of quark and antiquark makes a:
A. Meson
B. Baryon
C. Proton
D. Neutron

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