General Science for Class 7

Mixtures
Saline solution is mixture of
water
salt
gases
both a and b
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Atoms and Atom Model
The closer the shell to the nucleus, the
lower the energy level
higher the energy level
smaller the size
lighter the mass
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Heat Transfer
Ideal temperature for warm bath water is usually between
30 °C
40 °C
50 °C
60 °C
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Sound Waves
Who discovered the ‘Korotkoff’ sounds?
Isaac Newton
Dr.Nikolai Korotkoff
Michael Faraday
Thomas Silva Edison
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Electric Circuits and Currents
One of the cause of short circuits is
insulated wiring
fixed resistance
variable resistance
faulty wire insulation
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Dispersion of Light
The rods are mostly found
in the center of retina
at the blind spot
at the edges of retina
above and below retina
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Elements and Compounds
The gas which is used as cooling agent is
carbon dioxide
helium
argon
nitrogen
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Atoms and Atom Model
The first electromagnetic generator “Faraday disk” was built in
1381
1831
1813
1183
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Physical and Chemical Changes
A change of state from one form to other is a
physical change
chemical change
biological change
state variation
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Solutions
Some metals are so unreactive that they do not react with
copper
silver
gold
all of above
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