General Science for Class 7

Investigating Space
At night when we look up, we see
airplanes in the sky
moons in the sky
planets in the sky
stars and galaxies in the sky
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Atoms and Atom Model
If we add an electron to the outermost shell of an atom, the charge turns
negative
positive
neutral
unchanged
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Atoms and Atom Model
Gamma rays are used to detect
faults in human body
faults in metals
thieves and robbers
weapons
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Atoms Molecules and Ions
Smaller particles in an atom are called
atomic particles
subatomic particles
smaller particles
neutral particles
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Physical and Chemical Changes
Polyethene is
good conductor of heat
good conductor of electricity
poor insulator of electricity
good insulator of electricity
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Electric Circuits and Currents
Never run a wire under
floor
pool
carpet
sofa
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Sound Waves
The exact speed of sound depends upon
pressure
temperature
density
mass
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Electric Circuits and Currents
In conductors, electrons can flow because their
ions are free
protons are free
electrons are free
negative ions are free
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Dispersion of Light
In concave lenses, a distant object appears
upright
virtual
magnified
inverted
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Electric Circuits and Currents
Another gas, that is used as replacement of argon is known as
oxygen
carbon monoxide
nitrogen
hydrogen
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