26) Metal X is soft and can be easily cut with Knife. It is used in street light. What is X?
1. Sodium
2. Mercury
3. Calcium
4. Lithiu
27) In a garrison, there was food for 1000 soldiers for one month. After 10 days, 1000 more soldiers joined the garrison. How long would the soldiers be able to carry on with the remaining food?
1. 25 days
2. 20 days
3. 15 days
4. 10 days