Which lubricant is used for heavy machines? 

Which one of the following organisms has a role in converting nitrates to free nitrogen?

In these questions read each sentence to find out whether there is any error in it. If there is no error, the answer is (D).

Under no circumstances (A)/you would be allowed to remain (B)/ out of home after ten o’clock , (C)/said Radhika to her son (D).

A person bought 8 quintals of rice for certain rupees. After a week, he sold 3 quintals of rice at 10% profit, 3 quintals of rice with neither profit nor loss and 2 quintals at 5% loss. In this transaction what is the profit? 

The average of 21 consecutive natural numbers is 53. What is the value of the smallest of these 21 numbers?

A, B and C can do a work in 6, 12 and 24 days respectively. In what time will they finish the work while working together?

When did the British Government appoint the Sadler Commission to improve education?

From the given alternatives, select the word that can be formed from the letters of the given word.
CIRCUMSCRIBE