41: A goat is tied to two poles P and Q with ropes that are 15-metre long. P and Q are 20-metre apart as shown in the given diagram:


42: The Himalayas are formed of parallel fold ranges, of which the oldest range is

(a) the Siwalik Range

(b) the Lesser Himalayas

(c) the Great Himalayan Range

(d) the Dhaula Dhar Range
43: Which one of the following plants can fix nitrogen from air?

(a) Rice

(b) Wheat

(c) Pea

(d) Maize
44: 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
45: When the frequency distribution is normal

(a) median, mode and mean are all different from one another
(b) mean, mode and median are identical
(c) mean is greater than mode
(d) mean is greater than median