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

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 # 2

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

Question # 3

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

Question # 4

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

Question # 5

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

Question # 6

The number of isotopes of hydrogen are

Question # 7

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

Question # 8

The rate of decay of radioactive substance

Question # 9

When certain nucleus emits aβ-particles, is mass number:

Question # 10

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

Question # 11

Mass of proton is

Question # 12

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 13

Fraction of the decaying atoms per unit time is called

Question # 14

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

Question # 15

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 # 16

Radioactivity is

Question # 17

Structure of the nucleus was explained by

Question # 18

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 19

Neutron was discovered in

Question # 20

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

Question # 21

Pair production take place when energy ofγ-rays photon is

Question # 22

The total charge of any nucleus is given as

Question # 23

How many isotopes of helium are present?

Question # 24

Which of the following material has longer half life

Question # 25

The penetration power ofβ-particle is

Question # 26

The chemical behaviour of an atom is determined by

Question # 27

Radioactivity

Question # 28

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

Question # 29

The diameter of an atom is of the order

Question # 30

The number if neutrons in the nucleus of 92U235are

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
2 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
3 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
4 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
5 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
6 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
7 Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called
A. deuteron
B. deterium
C. protium
D. tritium
8 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
9 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
10 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron

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