486: Zayed bin Sultan-al-Nahyan was a long serving President of which of the following ?
(A) Oman
(B) United Arab Emirates
(C) Kuwait
(D) Saudi Arabia
487: Assertion (A)
Hiuen Tsang came to India during Harsha's rule
Reason (R)
His main objective was to visit the Buddhist shrines
(a) if A and R both are correct and R is the correct explanation of A
(b) if A and R both are correct but R is not the correct explanation of A
(c) if A is incorrect but R is correct
(d) if A is correct but R is incorrect
488: Arrange the following in the decreasing order of their carbon content:
I. Cast iron
II. Wrought iron
III. Steel
(a) I, II, III
(b) II, I, III
(c) III, II, I
(d) I, III, II
489: Who was the Governor-General of India during the Sepoy Mutiny?
(a) Lord Hardinge
(b) Lord Lytton
(c) Lord Canning
(d) Lord Dalhousie
490: What can be the impact of excessive / inappropriate use of nitrogenous fertilizers in agriculture?
1. Proliferation of nitrogen-fixing microorganisms in soil can occur.
2. Increase in the acidity of soil can take place.
3. Leaching of nitrate to the ground-water can occur.
Select the correct answer using the code given below.
(a) 1 and 3 only
(b) 2 only
(c) 2 and 3 only
(d) 1, 2 and 3