656: The length of the longest pole that can be placed in a room 12 m long and 9 m wide and 8 m high is
(a) 12 m
(b) 14 m
(c) 17 m
(d) 21 m
657: Arrange the following fertilisers according to the decreasing order of their nitrogen content:
I. Ammonium sulphate
II. Ammonium nitrate
III. Potassium nitrate
IV. Urea
(a) IV, II, III, I
(b) IV, II, I, III
(c) IV, III, II, I
(d) II, IV, III, I
658: In India, rural incomes are generally lower than the urban incomes. Which of the following reasons account for this ?
I. A large number of farmers are illiterate and know little about scientific agriculture.
II. Prices of primary products are lower than those of manufactured products.
III. Investment in agriculture has been low when compared to investment in industry.
Select the correct answer by using the codes given below :
Codes :
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III
659: The most important strategy for the conservation of biodiversity together with traditional human life is the establishment of
(a) biosphere reserves
(b) botanical gardens
(c) national parks
(d) wildlife sanctuaries
660: A rectangular water tank measures 15 m x 6 m at top and is 10 m deep. It is full of water. If water is drawn out lowering the level by 1 metre, how much of water has been drawn out ?
(a) 45,000 litres
(b) 90,000 litres
(c) 4,500 litres
(d) 900 litres