General Science

Forces Effects
The mass of a substance per unit of volume is called its
    weight
    density
    volume
    gravity
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Investigating Space
Besides energy, the explosions on the sun also produce
radiations
electromagnetic waves
sounds
friction
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Investigating Space
The sun, earth and all other stars in the galaxy race around its
center
borders
shape
orbits
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Mixtures
Mixing of metals with other metals or non-metals makes
alloy
metalloid
alkali
compound
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Dispersion of Light
Converging means to
spread out
invert
bring together
shrink
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Respiration and Food Energy
Hair in nostrils help to
inhale easily
exhale easily
clean air from dust
make the air warm
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Heat Transfer
At night, land turns to be
warm than sea
cool than sea
very hot
extremely hot
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Sound Waves
20 dB has hundred times more energy than
10 dB
0 dB
5 dB
2 dB
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Electric Circuits and Currents
The main disadvantage of series circuit is that if flow of current breaks in one part the whole circuit may
break
split
fuse
demolish
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Heat Transfer
The number of walls of a thermos is
1
2
3
4
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