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The mercury and sodium street lamps light up because of
atomic absorption
atomic emission
electron absorption
electron emission
D.
electron emission
The apparent weight of a man in a lift is less than the real weight when
Addition of excessive amounts of heat to lake is referred to as
The mercury and sodium street lamps light up because of
From the national point of view which of the following indicates Micro Approach?
Competition for food, light and space is most severe in
The green colour seen in firework displays is due to the chloride salt of
Kautilya's 'Artharshastra' mainly deals with
Rainbows are produced by when sunlight
Which of the following is used in pencils?
The branch of medicine involving synthetic chemical compounds is
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