General Science for Class 7

Digestive System
Eating food quickly stimulates the production of
saliva
enzymes
acid and gastric juice
alkali
Author: rikazzz Comment
Physical and Chemical Changes
The reaction of ‘magnesium’ with air is
exothermic reaction
endothermic reaction
reversible reaction
substitution reaction
Author: rikazzz Comment
Importance of Water
As the water evaporates, due to cold air it
drops back
condenses
turns into liquid
turns in gas
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Investigating Space
Space is getting bigger and galaxies are
coming closer
moving apart
expanding as well
shrinking instead of expanding
Author: rikazzz Comment
Electric Circuits and Currents
The SI unit for electric current is
joule
watt
volt
ampere
Author: rikazzz Comment
Sound Waves
In water the speed of sound is
100 m/s
200 m/s
1500 m/s
2000 m/s
Author: rikazzz Comment
Importance of Water
Water can be kept pure if we throw
litter in the trash
litter near a stream
litter near a pond
pour waste oil in rivers
Author: rikazzz Comment
Electric Circuits and Currents
Two or more cells when connected in series make a
battery
circuit
terminal
resistor
Author: rikazzz Comment
Dispersion of Light
Inside rain droplet, light
is refracted twice
is refracted thrice
is reflected once
is reflected twice
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Dispersion of Light
The colors known as primary colors are
red and green
red, yellow and green
red, blue and orange
red, green and blue
Author: rikazzz Comment

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