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Chapter 21 - Nuclear Physics - 1
1.
Radius of an atom is 10
5
times the radius of the _________.
a) Proton
b) Electron
c) Nucleus
2.
A nucleus consists of ___________ comprising of protons and neutrons.
a) Neutrons
b) Nucleons
c) Protons
3.
A proton has positive charge equal to____________
a) 1.6x10
-19
C
b) 1.8x10
-19
C
c) 1.4x10
-19
C
4.
1amu=_______________ kg.
a) 1.66606x10
-27
kg
b) 1.66606x6
-27
kg
c) 1.66606x8
-27
kg
5.
Radiations coming out of radioactive element are called__________.
a)
a
,
b
and
g
-rays
b) B Rays
c) A Rays
6.
When a
b
- particle is emitted out of any nucleus then its mass number remains constant but its charge number increases by _____
a) Two
b) Three
c) One
7.
The time in which half of the atoms of parent element decay into daughter element is called_____________
a) Third life
b) Quarter lifr
c) Half life
8.
T
1/2
= _______________.
a) 0.693/
l
b) 0.666/
l
c) 0.600/
l
9.
The elements with Z=92 are called____________.
a) Fissions
b) Transurance
c) Matters
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