Discussion
Consider the following sentences (A) and (B) about motions of the Earth and choose the correct option :
(A) Rotation is the movement of the earth on its axis.
(B) The axis of the Earth which is an imaginary line, makes an angle of 33½° with its orbital plane.
Choose the correct option :
Answer: A
The answer is Only (A) is correct.
Statement A is correct: rotation is the spinning of the Earth on its axis, which takes about 24 hours and causes day and night.
Statement B is wrong because of the angle. The Earth's axis makes an angle of 66½° with its orbital plane; equivalently it is tilted 23½° from the perpendicular to that plane. 33½° matches neither figure. (Note that 66½° and 23½° add up to 90°, a handy check.) So only A is correct.
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