231. Does the hummingbird belong to a category called?
- Ectotherm
- Endotherm
- Exotherm
- Heterotherm.
232. The Sun’s mass mainly consists of hydrogen (about 73%). The second main constituent (about 25%) is
- Hydrogen
- Helium
- Carbon dioxide
233. A radioactive isotope of Uranium used in Nuclear Bomb is?
- 92 U 235
- 92 U 234
- 92 U 233
- 92 U 238
234. Which woody raw material is used for the manufacture of paper pulp?
- Cotton
- Poplar
- Bagasse
235. Does the rectified spirit contain alcohol?
- 80%
- 95%
- 70%
- 85%
