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

Question # 2

The unit of decay constant is:

Question # 3

An alpha particle has a charge of

Question # 4

The half life of uranium-238 is

Question # 5

The range of particle depends upon the factor

Question # 6

The isotope/s of hydrogen is /are:

Question # 7

Which of the following material has longer half life

Question # 8

Nucleus consists of

Question # 9

How many isotopes of helium are present?

Question # 10

Neutron was disvovered by:

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

The chemical properties of all the isotopes of an elements are

Question # 15

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

Question # 16

In 1932 Chadwick discovered

Question # 17

Electrons are

Question # 18

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

Question # 19

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

Question # 20

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

Question # 21

The penetration power ofβ-particle is

Question # 22

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 23

The half lie of radium-226 is

Question # 24

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

Question # 25

Neutrons are

Question # 26

Radium was discovered by:

Question # 27

Nucleus of a hydrogen atom may contain:

Question # 28

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

Question # 29

Which of the following material has smaller has life

Question # 30

The diameter of an atom is of the order

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
2 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
3 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
4 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
5 The range of particle depends upon the factor
A. charge, mass and energy of particle
B. density of medium
C. ionization potential of the atoms
D. all the above
6 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
7 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
8 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
9 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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