Pipelines in cold countries often burst in winter because
1). water freezes and expands in its volume
2). temperature of ice is less than that of water
3). pipelines contract in their volume
4). pipelines expand due to freezing
1. The absolute zero is a temperature at which ________
2. Friction can be reduced by changing from
3. Which of the following are methods of heat transfer?
4. The time period of a seconds pendulum is
5. Superconductors are substances which
8. Energy of Ultraviolet rays is great than
9. On which of the following techniques photo state machine works ?
10. Prime Minister's 'Ujjwala Yojana' is related to __________________