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

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

Question # 2

The chemical properties of an element depends upon the number of

Question # 3

Phenomenon of radioactivity is due to disintegration of

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

Neutron was disvovered by:

Question # 6

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

Question # 7

Electrons are

Question # 8

For Protium, the mass defect is:

Question # 9

Binding energy per nucleus is

Question # 10

Pair production take place when energy ofγ-rays photon is

Question # 11

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

Question # 12

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 13

γ-rays are

Question # 14

The half life of uranium-238 is

Question # 15

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

Question # 16

Nucleus of a hydrogen atom may contain:

Question # 17

The total charge of any nucleus is given as

Question # 18

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

Question # 19

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

Question # 20

Neutron was discovered by

Question # 21

Radioactivity

Question # 22

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 # 23

Marie curie and Pierre curie discovered:

Question # 24

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

Question # 25

Structure of the nucleus was explained by

Question # 26

Charge on proton is

Question # 27

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

Question # 28

A curie represents a very strong source of

Question # 29

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

Question # 30

Which are not the elementary particles?

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Sr.# Question Answer
1 A mass spectrograph sort out
A. molecules
B. atoms
C. elements
D. isotopes
2 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
3 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
4 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
5 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
6 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
7 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
8 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
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
9 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
10 A particle having the mass of electron and charge of a proton is called a
A. photon
B. position
C. antiproton
D. antineutrino

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