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

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

Question # 2

How many isotopes of helium are present?

Question # 3

Neutron was disvovered by:

Question # 4

The rate of decay of radioactive substance

Question # 5

After alpha decay the atomic number of the atom

Question # 6

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

Question # 7

Fraction of the decaying atoms per unit time is called

Question # 8

A mass spectrograph sort out

Question # 9

Pair production take place when energy ofγ-rays photon is

Question # 10

Curie is a unit of

Question # 11

When certain nucleus emits anα particle, its mass number:

Question # 12

Radioactivity is

Question # 13

There is present in paraffin a large amount of:

Question # 14

The reciprocal of decay constant λ of a radioactive material is:

Question # 15

The half lie of radium-226 is

Question # 16

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

Question # 17

Proton was discovered by Rutherford in

Question # 18

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

Question # 19

Radioactivity was discovered by:

Question # 20

The half life of radioactive substances depends upon

Question # 21

Heavy water is made of one oxygen atom and two atoms of:

Question # 22

Rutherford performed an experiment on nuclear reactions in:

Question # 23

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 # 24

γ-rays are

Question # 25

Neutron was discovered in

Question # 26

The amount of energy equivalent to 1 a.m.u is

Question # 27

Mass of proton is

Question # 28

Structure of the nucleus was explained by

Question # 29

Mass of proton is of order of

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
2 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
3 An alpha particle has a charge of
A. +2e
B. -2e
C. -e
D. +3e
4 Heavy water is made of one oxygen atom and two atoms of:
A. Protium
B. Deuterium
C. Tritium
D. Any of these
5 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
6 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
7 There is present in paraffin a large amount of:
A. Nitrogen
B. Hydrogen
C. Carbon
D. Baryllium
8 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
9 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
10 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above

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