General Science for Class 7

Atoms and Atom Model
Electrons fill energy level starting from the
lowest level
highest level
central level
upper level
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Mixtures
Light bulbs are filled with
helium gas
neon gas
argon gas
hydrogen gas
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Sound Waves
Large concert halls have modified roofs which
absorb sounds
reflect sounds
increase loudness of sounds
decrease pitch of sounds
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Physical and Chemical Changes
The odour of ammonia is
sweet
attractive
weak
strong and pungent
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Electric Circuits and Currents
When the current flows opposite way, the cone is pulled
inwards
forward
backward
outwards
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Elements and Compounds
The general properties of metals are
shiny
ductile
malleable
all of above
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Physical and Chemical Changes
Plastics are made up of
small molecules
small atoms
large atoms
large molecules
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Heat Transfer
Light, radiant heat and radio waves travel at the same rate because they are
of different density
different elements
part of electromagnetic spectrum
part of energy
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Atoms and Atom Model
Atoms of sodium and chlorine are stuck by chemical glue which is known as
bond
alpha gum
force of glue
atomic gum
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Importance of Water
The color of water is
blue
green
white
none
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