ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

Fraction of the decaying atoms per unit time is called

Question # 2

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

Question # 3

The emission of radiations take place in elements, having charge number greater than

Question # 4

According to Rutherford atomic model, the positive charge in an atom

Question # 5

Mass of proton is of order of

Question # 6

How many isotopes of helium are present?

Question # 7

U-238 present in the natural uranium is about:

Question # 8

Gamma rays consist of steam of

Question # 9

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

Question # 10

An alpha particle has a charge of

Question # 11

Different radioactive material have

Question # 12

Neutron was discovered by

Question # 13

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

Question # 14

The rate of decay of a radioactive substance

Question # 15

Neutron was suggested to be in the nucleus by:

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
2 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
3 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
4 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
5 Three quarks make:
A. An electron
B. A meson
C. A baryon
D. A photon
6 Mass of proton is of order of
A. 10-31gm
B. 10-27kg
C. 10-24gm
D. 10+27kg
7 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
8 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
9 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
10 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these

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