Questions

Which one of the followingis notan allotrope of carbon?

By volume, 78% of air is _______________

For the buying and selling of precious metals such as Goldand Silver, the market established is termed as ________ .

Who discovered the ABO blood group system?

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'.

Industries should regularly check (1)/ if their machines are emitting (2)/ smoke within permission limits. (3)/ No error (4).

Which of the following is the cleanest source of energy?

The Great Smog of 1952 was a severe air-pollution event which affected _______.

June 21 marks the winter solstice in the _________ Hemisphere.