Bombay duck and hilsa are examples of
1). freshwater fish
2). marine fish
3). breeds of sheep
4). breeds of ducks
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1. Diamond is an allotropic form of:
2. An example of semiconductor is
3. Which of the following could be used as fuel in propellant or rockets ?
4. What is the most common salt in sea water ?
5. The bone of a mammal contains Haversian canals, which are connected by transverse canals known as
6. The process of covering water pipes made of Iron with Zinc layer to prevent corrosion is called :
7. Which is the most correct statement?