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

Radium was discovered by:

Question # 2

Marie curie and Pierre curie discovered:

Question # 3

An alpha particle has a charge of

Question # 4

Phenomenon of radioactivity is due to disintegration of

Question # 5

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

Question # 6

In 1932 Chadwick discovered

Question # 7

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

Question # 8

The number of all the protons and neutrons in a nucleus is known as

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 number of isotopes of hydrogen are

Question # 11

1 amu is equal to.

Question # 12

The nucleus left after the emission of some radiation is called:

Question # 13

The chemical properties of all the isotopes of an elements are

Question # 14

The rate of decay of radioactive substance

Question # 15

Referring to the above figure, we can say that of all the elements, the most stable element is

Question # 16

When certain nucleus emits anα particle, its mass number:

Question # 17

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

Question # 18

Mass of proton is

Question # 19

The half life of uranium-238 is

Question # 20

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

Question # 21

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

Question # 22

The number of protons inside a nucleus is called

Question # 23

Radiation detector are used to

Question # 24

U-238 present in the natural uranium is about:

Question # 25

The unit of decay constant is:

Question # 26

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

Question # 27

Structure of the nucleus was explained by

Question # 28

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

Question # 29

The penetration power ofβ-particle is

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 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
2 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C
3 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
4 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
5 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
6 Proton was discovered by Rutherford in
A. 1915
B. 1906
C. 1910
D. 1920
7 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
8 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
9 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
10 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

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