In electric supply lines in India, which parameter is kept constant? 

World’s longest land border is between which two countries?

Direction: In the following question, select the related letters from the given alternatives.
Energy: Joule :: Volume : ?

In a certain code language, '-' represents 'x', '÷' represents '+', '+' represents '÷' and 'x' represents '-'. Find out the answer to the following question.
15 - 6 + 10 x 3 ÷ 2 = ?

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 is very (a)/ drunk, so (b)/ he cannot tell (c)/ you even his name. (d)/ No error (e)