General Science for Class 7

Atoms and Atom Model
John Dalton carried out his experiment about atom in
1908
1808
1708
1608
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Investigating Space
Astronomers search black holes
directly
indirectly
using satellites
using space probes
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Sound Waves
A wave with ups and downs is known as
transverse wave
longitudinal wave
latitudinal wave
horizontal wave
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Electric Circuits and Currents
The number of charges an atom contains, is
1
2
3
4
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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
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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
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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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