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

00:00
Question # 1

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

Question # 2

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

Question # 3

Pair production take place when energy ofγ-rays photon is

Question # 4

A mass spectrograph sort out

Question # 5

Radioactivity was discovered by:

Question # 6

Neon gas have three isotopes whose atomic numbers are

Question # 7

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 8

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

Question # 9

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

Question # 10

γ-rays are

Question # 11

Electrons are

Question # 12

Nucleon means:

Question # 13

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

Question # 14

Rutherford performed an experiment on nuclear reactions in:

Question # 15

The rate of decay of a radioactive substance

Question # 16

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

Question # 17

The unit of decay constant is

Question # 18

Nucleus consists of

Question # 19

The number of protons inside a nucleus is called

Question # 20

Neutron was suggested to be in the nucleus by:

Question # 21

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

Question # 22

Which of these is not a radiation detector

Question # 23

Radioactivity was discovered by

Question # 24

When certain nucleus emits anα particle, its mass number:

Question # 25

The time required for a radioactive material to decrease in active by one half is called

Question # 26

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 27

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

Question # 28

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 29

The diameter of an atom is of the order

Question # 30

Neutron was disvovered by:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
2 There is present in paraffin a large amount of:
A. Nitrogen
B. Hydrogen
C. Carbon
D. Baryllium
3 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
4 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
5 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
6 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
7 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
8 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
9 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
10 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

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