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

00:00
Question # 1

When certain nucleus emits aβ-particles, is mass number:

Question # 2

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

Question # 3

Three quarks make:

Question # 4

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

Question # 5

The rate of decay of radioactive substance

Question # 6

Phenomenon of radioactivity is due to disintegration of

Question # 7

Neutron was discovered by

Question # 8

Charge on neutron is

Question # 9

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

Question # 10

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

Question # 11

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 # 12

Radiation detector are used to

Question # 13

Which of these is not a radiation detector

Question # 14

In 1932 Chadwick discovered

Question # 15

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

Question # 16

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 17

Radioactivity is

Question # 18

Mass of neutron is

Question # 19

Radium was discovered by:

Question # 20

Charge on proton is

Question # 21

According to Rutherford atomic model, the positive charge in an atom

Question # 22

An alpha particle has a charge of

Question # 23

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

Question # 24

Nucleon means:

Question # 25

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

Question # 26

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 27

The unit of decay constant is:

Question # 28

The nucleus left after the emission of some radiation is called:

Question # 29

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

Question # 30

Beta particles are

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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 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
4 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
5 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
6 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
7 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
8 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
9 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
10 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay

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