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

Radioactivity was discovered by

Question # 2

In radio-active decay, the original element which disintegrate to another element is called

Question # 3

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

Question # 4

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

Question # 5

γ-rays behave like a particle because they explain the

Question # 6

Nucleon means:

Question # 7

The half life of radioactive substances depends upon

Question # 8

The unit of decay constant is

Question # 9

After alpha decay the atomic number of the atom

Question # 10

The rate of decay of a radioactive substance

Question # 11

Curie is a unit of

Question # 12

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

Question # 13

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

Question # 14

Three quarks make:

Question # 15

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 16

Neutron was suggested to be in the nucleus by:

Question # 17

The chemical properties of an element depends upon the number of

Question # 18

Phenomenon of radioactivity is due to disintegration of

Question # 19

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

Question # 20

Which of these is not a radiation detector

Question # 21

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

Question # 22

For Protium, the mass defect is:

Question # 23

Nucleus of a hydrogen atom may contain:

Question # 24

Neutron was disvovered by:

Question # 25

Pair production take place when energy ofγ-rays photon is

Question # 26

How many isotopes of helium are present?

Question # 27

Charge on neutron is

Question # 28

In 1932 Chadwick discovered

Question # 29

A particle having the mass of electron and charge of a proton is called a

Question # 30

The nucleus/nuclei of hydrogen is/are:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
2 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
3 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
4 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
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 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
8 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
9 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
10 The chemical properties of an element depends upon the number of
A. electron
B. position
C. photons
D. neutrons

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