2486: Match rivers labelled A, B, C and D on the given map with their names given in the list and select the correct answer using the codes given below the list:
List I
1. St. Lawrence
2. Orinoco
3. Mackenzie
4. Amazon
5. Yukon
Codes:
(a) A-4, B-3, C-2, D-1
(b) A-5, B-3, C-1, D-2
(c) A-5, B-4, C-1, D-3
(d) A-3, B-1, C-4, D-2
2489: A free-floating astronaut A pushes another free-floating astronaut B in space. The mass of A is greater than that of B. The force exerted by the astronaut A on the astronaut B will be:
(a) Equal to zero.
(b) Equal to the force exerted by B on A.
(c) Greater than the force exerted by B on A.
(d) Less than the force exerted by B on A