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

1 amu is equal to.

Question # 2

Mass of neutron is

Question # 3

Rate of decay is actually described by.

Question # 4

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

Question # 5

The half life of radioactive substances depends upon

Question # 6

Charge on neutron is

Question # 7

Marie curie and Pierre curie discovered:

Question # 8

The half life of uranium-238 is

Question # 9

The penetration power ofβ-particle is

Question # 10

Alfa particles are

Question # 11

The number of protons inside a nucleus is called

Question # 12

Electrons are

Question # 13

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

Question # 14

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

Question # 15

An alpha particle has a charge of

Question # 16

Nucleus consists of

Question # 17

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 # 18

There is present in paraffin a large amount of:

Question # 19

β-particles are easily deflected by collisions than heavy

Question # 20

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

Question # 21

Radium was discovered by:

Question # 22

Which of the following material has longer half life

Question # 23

Nucleon means:

Question # 24

Radioactivity

Question # 25

After alpha decay the atomic number of the atom

Question # 26

The unit of decay constant is:

Question # 27

Mass of proton is of order of

Question # 28

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

Question # 29

The half lie of radium-226 is

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
2 Mass of neutron is
A. 1.67 x 10-31kg
B. 1.67 x 10-27kg
C. 9.1 x 10-31kg
D. 1.67 x 10-19kg
3 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
4 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
5 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000
6 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
7 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
8 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
9 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
10 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

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