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Biological Sciences
50
Modern Materials
21
Atomic Structure
87
Energy Resources
43
Elements and Substances
76
Plant Photosynthesis and Respiration
52
Space and Solar System
230
General Science for Class 6
1155
General Science for Class 7
2197
General Science for Class 8
0
Basics of Electricity
28
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Atoms and Atom Model
As there are same number of electrons and protons in an atom, atomic number can also be called
electron number
proton number
nucleon number
mass number
Author:
rikazzz
Comment
Electric Circuits and Currents
Live wire is a wire which has
current
zero current
has zero current but high voltage
has high current but zero voltage
Author:
rikazzz
Comment
Atoms and Atom Model
In radioactive decay, some isotopes release a small amount of energy which can be used to
fire up wood
generate electric current
light up a bulb
light up a whole town
Author:
rikazzz
Comment
Transportation in Plants
The tremendous force which pulls the water and mineral salts up to the leaves can pull these contents to the height of
20 meters
30 meters
40 meters
50 meters
Author:
rikazzz
Comment
Mixtures
Mixtures are impure and hence have different
melting point
boiling point
densities
melting and boiling point
Author:
rikazzz
Comment
Energy Resources
Atomic number of ‘Zinc’ is
10
20
30
40
Author:
rikazzz
Comment
Mixtures
Fire extinguishers are filled with a gas called
carbon dioxide
oxygen
helium
nitrogen
Author:
rikazzz
Comment
Physical and Chemical Changes
The material which John Hyatt used for his artificial ivory, was
complex
chromatid
celluloid
diplex
Author:
rikazzz
Comment
Electric Circuits and Currents
The wires used by simple circuits are
live and earth
live and neutral
live, neutral and earth
live, neutral, earth, positive and negative
Author:
rikazzz
Comment
Physical and Chemical Changes
Hydrogen is obtained by
reaction of methane
reaction of water
combustion of methane
boiling of water
Author:
rikazzz
Comment
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