ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

Try The MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Question # 1

How many isotopes of helium are present?

Question # 2

Radioactivity

Question # 3

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

Question # 4

The isotope/s of hydrogen is /are:

Question # 5

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

Question # 6

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

Question # 7

Mass of proton is

Question # 8

Neutron was discovered by

Question # 9

In wilson cloud chamber, the air becomes saturated with:

Question # 10

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 11

Neutron was disvovered by:

Question # 12

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

Question # 13

γ-rays are

Question # 14

The number of protons inside a nucleus is called

Question # 15

Charge on neutron is

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
3 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
4 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
5 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
6 Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called
A. deuterium
B. protium
C. tritium
D. none of these
7 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
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 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
10 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000

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