General Science

Electric Circuits and Currents
The number of charges an atom contains, is
1
2
3
4
Author: rikazzz Comment
Sound Waves
We cannot hear alarm of a clock if there is
vacuum in the jar
air in the jar
liquid in the jar
solid in the jar
Author: rikazzz Comment
Dispersion of Light
The lenses used for short sighted are
convex
biconvex
concave
flat lenses
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Forces Effects
The dead sea is full of
    sand
    salt
    minerals
    shells
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Physical and Chemical Changes
At the end of reaction, catalyst
vanishes
is used up
remains unchanged
resizes
Author: rikazzz Comment
Importance of Water
The solid matter settled at the bottom is scraped away by electricity in
metal screen
grit tank
sludge tank
filter bed
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Mixtures
For purification water is passed through
sand
colander
watch glass
strainer
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Electric Circuits and Currents
William Sturgeon made first electromagnet in
1820
1825
1920
1925
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Dispersion of Light
The reflection of light back to the medium again and again, is known as
internal reflection
critical reflection
total internal reflection
total critical reflection
Author: rikazzz Comment
Investigating Space
Radio waves have a higher wavelength than
sound
light waves
energy
current
Author: rikazzz Comment

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