Refrigerators keep food unspoiled because
1). at its low temperature bacteria and moulds are Inactive
2). at its low temperature the germs are killed
3). at Its low temperature the germs are frozen
4). it sterilises the food
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1. The metal present in vitamin B12 is
4. Who was the first man to go to space?
5. Question 3.1:What is the basic theme of organisation in the periodic table?
7. Which of the following is not a nucleon
8. Question 6.11:What criterion is followed for the selection of the stationary phase inchromatography?
9. In deep-sea diving, divers use a mixture of gases consisting of oxygen and