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Biological Sciences
50
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21
Atomic Structure
87
Energy Resources
43
Elements and Substances
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Space and Solar System
230
General Science for Class 6
1155
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2197
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Basics of Electricity
28
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Atoms and Atom Model
The atomic number of sodium is 11 and its atomic mass is 23 and the number of protons and neutrons in an atom of sodium is
11 and 11
11 and 23
23 and 11
11 and 12
Author:
rikazzz
Comment
Physical and Chemical Changes
Polythene was discovered in
1733
1833
1933
1633
Author:
rikazzz
Comment
Solutions
Oranges and lemon are sour due to the presence of
citrus acid
acetic acid
citric acid
carbonic acid
Author:
rikazzz
Comment
Physical and Chemical Changes
Molecules in high density polythene are
closely packed than low density polythene
far apart than in low density polythene
more vigorous than in low density polythene
more violent than in low density polythene
Author:
rikazzz
Comment
Energy Resources
When air holes of a Bunsen burner are closed they give
luminous flame
non luminous flame
aluminous flame
dull flame
Author:
rikazzz
Comment
Mixtures
‘1465’ is the boiling point for
sodium chloride
chlorine
sodium
water
Author:
rikazzz
Comment
Physical and Chemical Changes
‘Photosynthesis’ is a
physical process
chemical process
biological process
temporary process
Author:
rikazzz
Comment
Physical and Chemical Changes
Two major requirements for preparation of ammonia are
low temperature and high pressure
low temperature and pressure
high temperature and low pressure
high temperature and pressure
Author:
rikazzz
Comment
Feeding Relationships and Environment
Underneath hair of polar bear, the color of his skin is
pink
black
brown
white
Author:
rikazzz
Comment
Atoms and Atom Model
Most of the covalent compounds are found in
solid state
gaseous state
liquid state
both in liquid and gaseous state
Author:
rikazzz
Comment
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