The major constituent of vertebrate bone is
1). Calcium phosphate
2). Potassium hydroxide
3). Sodium chloride
4). Calcium carbonate
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1. Curd is sour due to presence of
2. The polymer used in making plastic crockery is
4. Which of the following are the ingredients of gun metal?
5. An electric iron has a heating element made of:
6. Potassium Permanganate is used for purifying drinking water, because
7. Which among the following types of coal produces most heat per unit?
8. 435: Conduction band electrons have more mobility than holes because they
9. A fountain pen Works on the principle of
10. Which type of radiations are absorbed by the upper layer of the atmosphere?