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

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 2

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 # 3

A curie represents a very strong source of

Question # 4

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

Question # 5

Alfa particles are

Question # 6

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 # 7

The rate of decay of radioactive substance

Question # 8

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 9

Mass of proton is

Question # 10

After alpha decay the atomic number of the atom

Question # 11

Nucleus consists of

Question # 12

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

Question # 13

The energy acquired by a mass of 1g moving with the speed of light is

Question # 14

The unit of decay constant is:

Question # 15

In 1932 Chadwick discovered

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Nucleus of a hydrogen atom may contain:
A. One neutron only
B. Two protons and one neutron
C. Two protons and two neutrons
D. Aany of above
2 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
3 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
4 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
5 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
6 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these
7 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
8 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian
9 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
10 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

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