Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful
A. Solar ultraviolet radiation
B. Solar infrared radiation
C. CO2 in the air
D. SO2 in the air
Answer: Option A
A. Solar ultraviolet radiation
B. Solar infrared radiation
C. CO2 in the air
D. SO2 in the air
Answer: Option A
Which of the following phenomenon is considered responsible for Global Warming?
A. Greenhouse effect
B. Fire in coal mines
C. Dry farming
D. Monsoon
E. Trade winds
The nucleus of an atom consists of
A. electrons and neutrons
B. electrons and protons
C. protons and neutrons
D. All of the above
The number of moles of solute present in 1 kg of a solvent is called its
A. molality
B. molarity
C. normality
D. formality
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