Advertisements
Advertisements
प्रश्न
State the energy changes which take place when:
Water freezes in the freezing chamber of a fridge.
Advertisements
उत्तर
The kinetic energy of water molecules is released in the form of heat energy.
संबंधित प्रश्न
Define calorific value of a fuel.
Which of the following produces more heat (per unit mass) on burning?
What is the source of heat contained in geothermal energy?
Name the two groups in which various sources of energy are classified. State on what basis are they classified.
Name the energy changes for the following:
bicycle brakes
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
Give one example when:
Sound energy changes to electric energy.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
What are the small particles that can be seen in a beam of light that enters a dark room?
