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

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

Question # 2

Mass of neutron is

Question # 3

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 # 4

The figure 1.007276μ shows the mass of an:

Question # 5

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

Question # 6

The counter, which also provides the power to the G.M. tube is called:

Question # 7

Radioactivity

Question # 8

Phenomenon of radioactivity is due to disintegration of

Question # 9

β-particles are easily deflected by collisions than heavy

Question # 10

Rate of decay is actually described by.

Question # 11

The unit of decay constant is:

Question # 12

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

Question # 13

The number if neutrons in the nucleus of 92U235are

Question # 14

The emission of radiations take place in elements, having charge number greater than

Question # 15

1 amu is equal to

Question # 16

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

Question # 17

Electrons are

Question # 18

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

Question # 19

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

Question # 20

Proton was discovered by Rutherford in

Question # 21

Which of these is not a radiation detector

Question # 22

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 23

Neutron was disvovered by:

Question # 24

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 # 25

The number of isotopes of hydrogen are

Question # 26

The number of protons inside a nucleus is called

Question # 27

After alpha decay the atomic number of the atom

Question # 28

U-238 present in the natural uranium is about:

Question # 29

Gamma rays consist of steam of

Question # 30

Radiation detector are used to

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
2 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
3 In his experiment on nuclear reactions, Rutherford bombardedα particles on:
A. Nitrogen
B. Hydrogen
C. Lead
D. Oxygen
4 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
5 The half life of uranium-238 is
A. 6.2 x 109years
B. 4.5 x 109days
C. 4.5 x 109years
D. 1.3 x 106years
6 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
7 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
8 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
9 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
10 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2

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