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

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

Question # 2

The isotope/s of hydrogen is /are:

Question # 3

Nucleus of a hydrogen atom may contain:

Question # 4

Radiation detector are used to

Question # 5

Charge on neutron is

Question # 6

Curie is a unit of

Question # 7

The chemical properties of an element depends upon the number of

Question # 8

The half lie of radium-226 is

Question # 9

Radioactivity

Question # 10

The most abundant isotope of neon is

Question # 11

Examples of moderators used in a fission reactor is/are:

Question # 12

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

Question # 13

Neutron was disvovered by:

Question # 14

The half life of radioactive substances depends upon

Question # 15

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 16

After alpha decay the atomic number of the atom

Question # 17

Phenomenon of radioactivity is due to disintegration of

Question # 18

Rate of decay is actually described by.

Question # 19

β-particles are easily deflected by collisions than heavy

Question # 20

The emission of radiations take place in elements, having charge number greater than

Question # 21

Which of these is not a radiation detector

Question # 22

U-238 present in the natural uranium is about:

Question # 23

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

Question # 24

The penetration power ofβ-particle is

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

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

Question # 29

The diameter of an atom is of the order

Question # 30

The energy is found from Einstein's mass energy relation is called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 For an atom having atomic number Z and atomic weight A, the number of electron in an atoms
A. A - Z
B. A + Z
C. Z
D. A
2 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
3 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
4 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
5 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
6 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
7 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
8 γ-rays are
A. electrostatic waves
B. electromagnetic waves
C. heavy particles
D. longitudinal waves
9 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
10 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

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