536: Assertion (A) :
Formic acid is a stronger acid than acetic acid.
Reason (R):
Formic acid is an organic acid.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is NOT a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
537: The ancient Indian coins were introduced during the:
(a) 3rd century AD
(b) 3rd century BC
(c) Kanishka's period
(d) Ashoka's reign
538: Consider the following statements made about the sedimentary rocks :
I. Sedimentary rocks are formed at Earth's surface by the hydrological system.
II. The formation of sedimentary rocks involves the weathering of pre-existing rocks.
III. Sedimentary rocks contain fossils.
IV. Sedimentary rocks typically occur in layers.
Which of these statements are correct ?
(a) I and II
(b) I and IV
(c) II, III and IV
(d) I, II, III and IV
539: In the context of which one of the following arc the terms pyrolysis and plasma gasification mentioned?
(a) Extraction of rare earth elements
(b) Natural gas extraction technologies
(c) Hydrogen fuel-based automobiles
(d) Waste-to-energy technologies
540: Which of the following constitute Capital Account?
1. Foreign Loans
2. Foreign Direct Investment
3. Private Remittances
4. Portfolio Investment
Select the correct answer using the codes given below.
(a) 1, 2 and 3
(b) 2, 3 and 4
(c) 1, 3 and 4
(d) 1, 2 and 4