Questions

The pH of a solutiion is 3. When its pH changes to 6, then H+ ion concentration

Which among the following is used to generate light, to weld metals?

Pneumonia affects which of the following organs of human body?

In the following passage some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

The _____ of energy in India are met from both commercial and non commercial sources. The most _____ sources of energy today are coal and natural gas, hydro
electricity and nuclear power. On the other hand, firewood, cow-dung cakes and vegetable waste etc. _____ non commercial forms of energy. While non commercial
forms of energy _____ demand, coal is the _____ source of commercial energy in India.

On the other hand, firewood, cow-dung cakes and vegetable waste etc. _____ non commercial forms of energy.

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'.
My brother finds it difficult (1)/ to pass away the time (2)/ at our grandparent's house. (3)/ No Error (4)

Which of the following animals do NOT belong to the class of reptiles?

What cells line the ventricles of the brain?

The oldest oil field in Asia is located in