ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

Alfa particles are

Question # 2

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

Question # 3

The rate of decay of a radioactive substance

Question # 4

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 5

Beta particles are

Question # 6

Structure of the nucleus was explained by

Question # 7

Proton was discovered by Rutherford in

Question # 8

Three quarks make:

Question # 9

Radium was discovered by:

Question # 10

Fraction of the decaying atoms per unit time is called

Question # 11

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

Question # 12

Nucleon means:

Question # 13

In radio-active decay, the original element which disintegrate to another element is called

Question # 14

Mass of proton is of order of

Question # 15

How many isotopes of helium are present?

Question # 16

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

Question # 17

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

Question # 18

Neutrons are

Question # 19

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 20

A mass spectrograph sort out

Question # 21

Radioactivity

Question # 22

The number of isotopes of hydrogen are

Question # 23

Radioactivity was discovered by:

Question # 24

Radioactivity is

Question # 25

Radiation detector are used to

Question # 26

Pair production take place when energy ofγ-rays photon is

Question # 27

The half life of radioactive substances depends upon

Question # 28

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 29

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

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 In his experiment on nuclear reactions, Rutherford bombardedα particles on:
A. Nitrogen
B. Hydrogen
C. Lead
D. Oxygen
2 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
3 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
4 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
5 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
6 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
7 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
8 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
9 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
10 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

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