Dry powder fire extinguishers contain
1). sand
2). sand and sodium carbonate
3). sand and potassium carbonate
4). sand and sodium bicarbonate
1. The BOD values of water indicate the
2. Substance used as an anti freeze in radiators of automobiles is :
3. Which of the following is a natural dye ?
4. Which among the following is used in making liquors, medicines and as a fuel in aircrafts?
5. Helium gas is filled in ballons because
6. Who played the lead character in the movie 'Bandit Queen'?
7. Question 14.1:Define environmental chemistry.
9. The chemical(s) most commonly used for cloud seeding or artificial rainmaking is are
10. The product, 9-nitroanthracene is obtained from anthracene by the action of