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 range of particle depends upon the factor

Question # 2

The unit of decay constant is

Question # 3

Neon gas have three isotopes whose atomic numbers are

Question # 4

The chemical properties of all the isotopes of an elements are

Question # 5

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

Question # 6

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

Question # 7

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 8

When a nucleus emits an alpha particles, its charge number decreases by

Question # 9

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

Question # 10

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

Question # 11

The unit of decay constant is:

Question # 12

Mass of neutron is

Question # 13

A mass spectrograph sort out

Question # 14

Which of the following material has smaller has life

Question # 15

Mass of proton is

Question # 16

The rate of decay of radioactive substance

Question # 17

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 # 18

Electrons are

Question # 19

Different radioactive material have

Question # 20

Radioactivity was discovered by:

Question # 21

After alpha decay the atomic number of the atom

Question # 22

Rate of decay is actually described by.

Question # 23

Charge on proton is

Question # 24

Neutron was disvovered by:

Question # 25

γ-rays are

Question # 26

Structure of the nucleus was explained by

Question # 27

Pair production take place when energy ofγ-rays photon is

Question # 28

The figure 1.007276μ shows the mass of an:

Question # 29

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

Question # 30

Fraction of the decaying atoms per unit time is called

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The number of all the protons and neutrons in a nucleus is known as
A. atomic number
B. mass number
C. charge number
D. none of these
2 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
3 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
4 U-238 present in the natural uranium is about:
A. 59%
B. 0.007%
C. 99%
D. 39%
5 Neutron was suggested to be in the nucleus by:
A. Rutherford in 1920
B. Bohar in 1913
C. Dirac in 1928
D. Anderson in 1932
6 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
7 In radio-active decay, the original element which disintegrate to another element is called
A. element
B. daughter element
C. parent element
D. none of these
8 The missing mass which is converted to energy in the formation of nucleus, is called
A. packing fraction
B. mass defect
C. binding energy
D. none of these
9 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
10 In wilson cloud chamber, the air becomes saturated with:
A. Alcohol vapours
B. Water
C. Helium gas
D. Nitrogen gas

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