1. Which of the following is a planet having a strong greenhouse effect with a surface temperature of averages 480°C (900°F)?
(A). Earth.
(B). Pluto.
(C). Mars.
(D). Venus.
(E). None of these
ANS: D
2. Which of the following is the amount of force applied over an area of table?
(A). Density
(B). Pressure
(C). Temperature
(D). Weight
ANS: B
3. There is a 21% ……… and 78% ……… in a volume of air near the earth’s surface.
(A). Oxygen, hydrogen
(B). Hydrogen, oxygen
(C). Oxygen, nitrogen
(D). Nitrogen, water vapor
(E). None of these
Answer: C