Q.
A. If one end of a towel is dipped in water filled vessel, then after some time the entire towel is wet.
B. Writing nib is split in the middle.
C. The designing of the aero plane wings such that the curvature of its upper surface is greater than that of the lower.
D. Ploughing of fields helps retain moisture in them.
E. None of the above
Correct choice: C
Explanation: