ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

The penetration power ofβ-particle is

Question # 2

The energy acquired by a mass of 1g moving with the speed of light is

Question # 3

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

Question # 4

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 # 5

The most abundant isotope of neon is

Question # 6

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

Question # 7

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 8

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

Question # 9

The chemical properties of an element depends upon the number of

Question # 10

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 11

Fraction of the decaying atoms per unit time is called

Question # 12

Which of the following material has smaller has life

Question # 13

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

Question # 14

Alfa particles are

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 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
2 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
3 Mass of proton is
A. 1.67 x 10-27kg
B. 1.67 x 10-31kg
C. 1.66 x 10-34kg
D. 1.67 x 10-17kg
4 When certain nucleus emits anα particle, its mass number:
A. Increases by one
B. Decreases by one
C. Remain same
D. Decreases by four
5 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
6 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
7 Neutron was discovered by
A. Curie
B. Roentgen
C. Chadwick
D. Rutherford
8 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
9 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
10 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

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