The best conductor of heat is?

The capital of Australia is-

Which state is the leader in canal irrigation in India?

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select No Error.

He explained that the pillars of tribalism (1)/ that humans rely on for security would always (2)/ counter any significant culture or social change. (3)/ No error (4)

Directions : In these questions , a part of the sentence is given in bold . Below are given alternatives to the bold part at (A) , (B) and (C) which may improve the sentence . Choose the correct alternative . In case no improvement is needed you answer is (D ) .

Stop bunking classes lest you are caught.

A man invested a certain sum in scheme A at 15% p.a. for 2 years and earned Rs 1950 as simple interest. He increased his sum by Rs. ‘x’ and invested in another scheme B at 10% p.a. C.I. for 2 years and received Rs. 1680 as compound interest. Find the value of ‘x’.