General Science for Class 7

Atoms and Atom Model
The mass number of ‘helium’ is
2
4
6
8
Author: rikazzz Comment
Atoms and Atom Model
Oxygen is a diatomic gas so its chemical formula is
O²
O₂
O
Ox
Author: rikazzz Comment
Heat Transfer
To prevent loss of heat through walls, the walls must be
insulated
conducted
painted black
painted dull
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Electric Circuits and Currents
Atoms have same number of
protons and neutrons
electrons and neutrons
electrons and protons
positrons and photons
Author: rikazzz Comment
Digestive System
The process of breaking down food into smaller molecules is known as
digestion
breakage
crushing
grinding
Author: rikazzz Comment
Electric Circuits and Currents
Electricity is required to
light up homes
clean your car
flush the toilet
change weather
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Solutions
‘Malic acid’ is present in
orange
lemon
apple
guava
Author: rikazzz Comment
Electric Circuits and Currents
Earth wire is connected to the
ground
appliance
power house
transformer
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Sound Waves
Sound waves are converted by
speakers
computers
microphones
monitors
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Forces Effects
A substance will float on surface of water if its density is less than
    liquid
    gas
    both a and b
    aqueous
Author: rikazzz Comment

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