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486. Which of the following is not an effect produced by rotation of earth ?
A. It causes days and nights.
B. All heavenly bodies like sun, moon, planets appear to move from East to West.
C. Winds change their directions
D. Poles have days and nights of 6 months duration.
Explanation:
487. Albedo is defined as
A. UV radiations sent out by the Sun
B. a substance contained in the upper atmospheric layers of the earth, which is responsible for the reflection of a part of solar radiations
C. celestial bodies in earth s atmosphere which and to the green house effect.
D. the amount of insolation reflected back to the space by the top of atmosphere, by clouds and ice-covered areas of the Earth s surface
Explanation:
488. Which of the following are true regarding equinoxes ? (i) They occur on March 21st and Sept 23rd (ii) They depict equal days and equal nights on march 21st and Sept 23rd on all places of the earth. (iii) All places on the earth have equal temperature during equinoxes
A. (i) and (iii) only
B. (ii) and (iii) only
C. (i) and (ii) only
D. (i), (ii) and (iii)
Explanation:
489. Twelve constellations referred to as zodiac, are
A. Signs of Roman gods
B. Imaginary region that encompass the path of the planets
C. A group of stars
D. Non of these
Explanation:
490. Which of the following phenomenon gives an evidence for the spherical shape of the earth ?
A. Solar eclipse
B. Lunar eclipse
C. Revolution
D. Rotation of Earth
Explanation: