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

The number of isotopes of hydrogen are

Question # 2

The number if neutrons in the nucleus of 92U235are

Question # 3

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

Question # 4

Binding energy per nucleus is

Question # 5

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

Question # 6

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

Question # 7

The half lie of radium-226 is

Question # 8

A pair of quark and antiquark makes a:

Question # 9

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 # 10

1 amu is equal to.

Question # 11

γ-rays are

Question # 12

Alfa particles are

Question # 13

In 1932 Chadwick discovered

Question # 14

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

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
A. polonium uranium
B. uranium and radium
C. polonium and radium
D. none of these
2 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
3 Radium was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. Rutherford
4 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
5 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
6 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
7 Curie is a unit of
A. reluctance
B. resistivity
C. binding energy
D. radioactivity
8 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
9 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
10 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time

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