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

Curie is a unit of

Question # 2

According to Rutherford atomic model, the positive charge in an atom

Question # 3

The unit of decay constant is

Question # 4

The range of particle depends upon the factor

Question # 5

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

Question # 6

Radiation detector are used to

Question # 7

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

Question # 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

Question # 9

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

Question # 10

The figure 1.007276μ shows the mass of an:

Question # 11

The penetration power ofβ-particle is

Question # 12

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

Question # 13

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

Question # 14

The chemical properties of all the isotopes of an elements are

Question # 15

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

Question # 16

Radioactivity was discovered by

Question # 17

Phenomenon of radioactivity is due to disintegration of

Question # 18

Rutherford performed an experiment on nuclear reactions in:

Question # 19

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

Question # 20

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

Question # 21

Pair production take place when energy ofγ-rays photon is

Question # 22

Neutron was suggested to be in the nucleus by:

Question # 23

The chemical behaviour of an atom is determined by

Question # 24

Beta particles are

Question # 25

How many isotopes of helium are present?

Question # 26

The number of isotopes of hydrogen are

Question # 27

Neon gas have three isotopes whose atomic numbers are

Question # 28

Neutron was discovered by

Question # 29

Which are not the elementary particles?

Question # 30

Rate of decay is actually described by.

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When thorium nucleus emits aβ-particle, the daughter nucleus is called:
A. Protactinium
B. Actinium
C. Uranium
D. Radium
2 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
3 Referring to the above figure, we can say that of all the elements, the most stable element is
A. Phosphours
B. Iron
C. uranium
D. Lithium
4 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
5 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
6 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
7 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
8 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
9 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
10 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A

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