ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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 amount of energy equivalent to 1 a.m.u is

Question # 2

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

Question # 3

The reciprocal of decay constant λ of a radioactive material is:

Question # 4

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 5

The rate of decay of a radioactive substance

Question # 6

A pair of quark and antiquark makes a:

Question # 7

The range ofβ-particle in air is greater than that ofα-particle by

Question # 8

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

Question # 9

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

Question # 10

The half lie of radium-226 is

Question # 11

The number of protons inside a nucleus is called

Question # 12

The total charge of any nucleus is given as

Question # 13

Electrons are

Question # 14

Alfa particles are

Question # 15

Rate of decay is actually described by.

Question # 16

Neutron was disvovered by:

Question # 17

Nucleus of a hydrogen atom may contain:

Question # 18

The chemical behaviour of an atom is determined by

Question # 19

Binding energy per nucleus is

Question # 20

When certain nucleus emits anα particle, its mass number:

Question # 21

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 # 22

In wilson cloud chamber, the air becomes saturated with:

Question # 23

Radioactivity is

Question # 24

Mass of proton is of order of

Question # 25

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

Question # 26

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 27

The diameter of an atom is of the order

Question # 28

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 # 29

How much time, theα-particle more massive than an electron

Question # 30

Referring to the above figure, we can say that of all the elements, the most stable element is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
2 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
3 Electrons are
A. positive charged
B. negatively charged
C. massless
D. neutral
4 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
5 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
6 Rutherford performed an experiment on nuclear reactions in:
A. 1718 A.D
B. 1818 A.D
C. 1918 A.D
D. 2001 A.D.
7 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
8 Beta particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
9 When a nucleus emits an alpha particles, its charge number decreases by
A. 3
B. 2
C. 6
D. 5
10 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

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