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

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

Question # 2

The chemical behaviour of an atom is determined by

Question # 3

When certain nucleus emits aβ-particles, is mass number:

Question # 4

The counter, which also provides the power to the G.M. tube is called:

Question # 5

The rate of decay of radioactive substance

Question # 6

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

Question # 7

Three quarks make:

Question # 8

There is present in paraffin a large amount of:

Question # 9

The nuclei of an element having the same charge number but different mass numbers are called:

Question # 10

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

Question # 11

Structure of the nucleus was explained by

Question # 12

A particle having the mass of electron and charge of a proton is called a

Question # 13

1 amu is equal to

Question # 14

Beta particles are

Question # 15

Which of these is not a radiation detector

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
2 Phenomenon of radioactivity is due to disintegration of
A. nucleus
B. neutron
C. proton
D. molecule
3 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
4 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
5 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
6 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg
7 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
8 The chemical properties of all the isotopes of an elements are
A. same
B. different
C. slightly different
D. none of these
9 Marie curie and Pierre curie discovered:
A. Uranium
B. Polonium
C. Radium
D. Both (A) and (C)
10 How much time, theα-particle more massive than an electron
A. 600
B. 7000
C. 5000
D. 15000

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