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21 . Which one among the following statements is not correct?
A. Solar noon occurs simultaneously at locations with the same longitude
B. One meridian, which is directly under the sun, experiences solar noon at a given time
C. Places having same longitude experience solar noon at different times
D. Solar noon occurs at different times at locations with the same latitude

22 . Variations in the length of daytime and nighttime from seasons are due to
A. the earth's rotation on its axis
B. the earth's revolution round the sun in an elliptical manner
C. latitudinal position of the place
D. revolution of the earth on a titled axis

23 . What is the time taken by the Earth to complete one rotation on its imaginary axis?
A. 24 hr 37 min 23 sec B. 24 hr
C. 23 hr 56 min 4 sec D. 23 hr 52 min

24 . The tropic of Cancer does not pass through:
A. India B. Egypt
C. Mexico D. Iran

25 . How does the sun get its energy?
A. From gravitational pressure
B. From nuclear fission
C. From nuclear fusion
D. None of the above