ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

Pair production take place when energy ofγ-rays photon is

Question # 2

The number of all the protons and neutrons in a nucleus is known as

Question # 3

Radiation detector are used to

Question # 4

The number of isotopes of hydrogen are

Question # 5

Charge on proton is

Question # 6

Mass of proton is

Question # 7

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 8

An alpha particle has a charge of

Question # 9

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

Question # 10

Structure of the nucleus was explained by

Question # 11

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 12

Which of the following material has smaller has life

Question # 13

Radium was discovered by:

Question # 14

The diameter of an atom is of the order

Question # 15

A pair of quark and antiquark makes a:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932
3 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
4 In radioactive decay, the new element which is formed due to the disintegration of original element is called
A. element
B. daughter element
C. parent element
D. none of these
5 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
6 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
7 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
8 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
9 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
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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