Which would do maximum harm to a tree?
1). The loss of its bark
2). The loss of half of its leave.
3). The loss of all its leaves
4). The loss of half of its branches
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1. Which one of the following is not a greenhouse gas ?
2. Plaster of Paris is made by partial dehydration of
4. The polymer used in making plastic crockery is
5. When a vibrating tuning fork is placed on a table a loud sound is heard. This is due to :
6. Which of the following could be used as fuel in propellant or rockets ?
9. The dimension of which of the following is the same as that of impulse?