The isotope of uranium capable of sustaining chain reaction is
A). U-235
B). U-245
C). U-239
D). U-238
1. Percentage of lead in lead pencils is
2. The major harmful gas emitted by automobile vehicles which causes air pollution is
3. Petroleum consists of a mixture of
4. Watson and Crick composed the model of DNA structure in
5. Byproduct obtained by soap industry is
6. The greenhouse effect is caused by the higher level of which gas in the atmosphere ?
7. What is the maximum Water Vapour content in the atmosphere?
8. Grafting is not possible in monocots because they
9. The resources which can be used continuously year after year ate called