ICSE Worksheet for chapter-11 Transfer of Heat class 9

ICSE Worksheet for chapter-11 Transfer of Heat class 9

Worksheet For class 9

Find ICSE Worksheet for chapter-11 Transfer of Heat class 9

CLASS-9

BOARD: ICSE

Physics Worksheet - 11

TOPIC: Transfer of Heat

For other ICSE Worksheet for class 9 Science check out main page of Physics Wallah.

SUMMARY

• Radiation, Detection of Heat Radiators, Absorption Power of a Body
• Emission Power of a Body, Applications of Black and White Surfaces
• Green House Effect & Global Warming, Heat Insulation in a House
• Vacuum Flask, Distinction Between Conduction, Convection and Radiation

SECTION 1 – OBJECTIVE

1. A good conductor of heat is:
   1. Wood
   2. Asbestos
   3. Air
   4. Mercury
2. In convection, heat is transferred:
   1. Upwards
   2. Downwards
   3. Sideways
   4. In all directions
3. Black or dull surfaces are……. reflectors, but……. absorbers of heat.
   1. Poor, good
   2. Good, poor
   3. Poor, poor
   4. Good, good
4. The fastest mode of transfer of heat is:
   1. Conduction
   2. Convection
   3. Radiation
   4. All the above three
5. 5. In thermos flask, the vacuum between its walls reduces the heat loss by:
   1. Conduction
   2. Convection
   3. Radiation
   4. Conduction and convection both
6. The solar radiations are absorbed by:
   1. The polar ice-caps
   2. The Earth’s atmosphere
   3. The clouds
   4. None of these
7. The greenhouse gas is:
   1. Oxygen
   2. Nitrogen
   3. Chlorine
   4. Carbon-dioxide
8. Heat in a liquid is mainly transferred by:
   1. Conduction
   2. Convection
   3. Radiation
   4. Conduction and radiation
9. The transfer of heat inside a rod takes place by
   1. Conduction only
   2. Convection only
   3. Radiation only
   4. Conduction and convection
10. The freezing chest in a refrigerator is kept near the top because:
    1. It is convenient to use
    2. It reduces cost
    3. Convection currents are set up
    4. It cools the remaining space by the process of Radiation

SECTION 2 - SUBJECTIVE

1. Give two practical uses of insulators
2. Explain the formation of land and sea breezes
3. In thermos-flask, explain how the heat losses are minimized from its contents by:
   1. Conduction
   2. Convection
   3. Radiation
4. Explain the following:
   1. Cooking utensils are often blackened at the bottom but they are polished at the top and on the side
   2. On opening the windows of a glass walled room, the inside temperature falls
   3. It is warmer inside a green-house even on a dull sunshine day than it is outside
   4. Water is always heated from below
5. Name the three processes of heat transfer and distinguish between them.

Solutions: to worksheet-11 Topic-Transfer of Heat

Objective Problems: