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 half life of radioactive substances depends upon

Question # 2

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

Question # 3

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

Question # 4

Nuclei that have the same charge number but different mass number are called

Question # 5

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

Question # 6

Neutrons are

Question # 7

Radioactivity is

Question # 8

Radioactivity was discovered by:

Question # 9

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 # 10

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

Question # 11

In wilson cloud chamber, the air becomes saturated with:

Question # 12

After alpha decay the atomic number of the atom

Question # 13

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 # 14

Mass of neutron is

Question # 15

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

Question # 16

Neutron was discovered in

Question # 17

Which are not the elementary particles?

Question # 18

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

Question # 19

The half life of uranium-238 is

Question # 20

Neutron was discovered by

Question # 21

Radiation detector are used to

Question # 22

The chemical properties of all the isotopes of an elements are

Question # 23

The half lie of radium-226 is

Question # 24

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

Question # 25

Different radioactive material have

Question # 26

Binding energy per nucleus is

Question # 27

The chemical behaviour of an atom is determined by

Question # 28

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 29

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

Question # 30

A curie represents a very strong source of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When certain nucleus emits aβ-particles, is mass number:
A. Remain same
B. Increases by one
C. Decreases by one
D. Decreases by four
2 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
3 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
4 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
5 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
6 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
7 Which of these is not a radiation detector
A. Wilson cloud chamber
B. cyclotron acceleration
C. Geiger Miller counter
D. solid state detector
8 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
9 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
10 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143

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