Q19. Which of the following designs of a door knob would be the most comfortable for a small child to open the door?
A.
B.
C.
D.
Q20. A boat rises above the water level as it enters the sea from a river.
River Given below are some reasons. I. Density of sea water is greater than density of river water. II. Density of river water is greater than density of sea water. III. A boat displaces more water in the sea than a river. IV. A boat displaces more water in a river than the sea Which of these reasons is/are correct? A. B. C. D.
Only I is correct. Only II is correct. Both II and III are correct. Both I and IV are correct.
Sea