846: Every time a man hits the target he gets one rupee and every time he misses the target he has to pay the rupee. He is allowed to try 100 times and gets an amount of Rs. 30. How many times did he hit the target?
(a) 60
(b) 65
(c) 70
(d) 75
847: What number comes next?
4, 196, 16, 144, 36, 100, 64,...
(a) 36
(b) 100
(c) 80
(d) 64
848: The Ryotwari Settlement was introduced by the British in the
(a) Bengal Presidency
(b) Madras Presidency
(c) Bombay Presidency
(d) Madras and Bombay Presidencies
849: Consider the following statements:
1. Agricultural soils release nitrogen oxides into environment.
2. Cattle release ammonia into environment.
3. Poultry industry releases reactive nitrogen compounds environment.
Which of the statements given above is/arc correct?
(a) 1 and 3 only
(b) 2 and 3 only
(c) 2 only
(d) 1, 2 and 3
850: Chemical composition of pearl is:
(a) Calcium carbonate
(b) Calcium carbonate and magnesium carbonate
(c) Calcium sulphate
(d) Calcium chloride