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

A pair of quark and antiquark makes a:

Question # 2

The unit of decay constant is:

Question # 3

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

Question # 4

Examples of moderators used in a fission reactor is/are:

Question # 5

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 6

Rate of decay is actually described by.

Question # 7

The total charge of any nucleus is given as

Question # 8

Neutron was disvovered by:

Question # 9

1 amu is equal to

Question # 10

Which of these is not a radiation detector

Question # 11

Which of the following material has longer half life

Question # 12

How many isotopes of helium are present?

Question # 13

Curie is a unit of

Question # 14

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

Question # 15

Which are not the elementary particles?

Question # 16

For Protium, the mass defect is:

Question # 17

Neutrons are

Question # 18

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

Question # 19

The chemical behaviour of an atom is determined by

Question # 20

The half life of uranium-238 is

Question # 21

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

Question # 22

The diameter of an atom is of the order

Question # 23

The range ofβ-particle in air is greater than that ofα-particle by

Question # 24

The number of protons inside a nucleus is called

Question # 25

Nucleon means:

Question # 26

The energy acquired by a mass of 1g moving with the speed of light is

Question # 27

In wilson cloud chamber, the air becomes saturated with:

Question # 28

When certain nucleus emits anα particle, its mass number:

Question # 29

Radioactivity was discovered by

Question # 30

When a charged particle passes through matter, it produces ionization, this effect is used in

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
2 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
3 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
6 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
7 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
8 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
9 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
10 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

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