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16. Nights are cooler in the deserts because
A. sand radiates heat less quickly as compared to earth.
B. the sky is generally clear.
C. sand radiates heat more quickly as compared to earth.
D. the sky is generally cloudy.
Explanation:
17. The scientist, who is considered as the Father of Genetics, is
A. Lamarck
B. Charles Darwin
C. Hugo de Vries
D. Johann Gregor Mendel
Explanation:
18. The difference between a musical sound and noise lies in
A. intensity
B. pleasantness
C. wavelength
D. pitch
Explanation:
19. Life is absent on moon due to lack of
A. carbon
B. hydrogen
C. nitrogen
D. water
Explanation:
20. Conduction of current in an aqueous solution of sodium chloride is by
A. electrons only
B. chloride ions only
C. sodium ions only
D. sodium and chloride ions
Explanation:
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