In nuclear raeactors the speed of neutrons is slowed down by -
1). heavy water
2). ordinary water
3). ?zinc rods
4). moten caustic soda?
1. Which among the following is a carbohydrate ?
2. Which of the following is a natural polymer?
3. Question 14.8:What are the harmful effects of photochemical smog and how can they be controlled?
4. The compounds formed when hydrogen combines with p-block elements are called
6. In the electroplating of gold the electrolyte used is?
8. Which of the following metals has least melting point ?
9. Mortar is a mixture of water sand and
10. Stainless steel is usually made by alloying the steel with