Advertisements
Advertisements
प्रश्न
If 4.5kg of fuel is completely burnt and amount of heat produced stands measured at 1, 80,000 KJ what is the calorific value.
उत्तर
Calorific value = `"Heat Produced"/"Amount of Fuel"="1,80,000"/"4.5"= 40000`
∴ Calorific value = 40,000 kj/kg
APPEARS IN
संबंधित प्रश्न
Abida and Ramesh were doing an experiment in which water was to be heated in a beaker. Abida kept the beaker near the wick in the yellow part of the candle flame. Ramesh kept the beaker in the outermost part of the flame. Whose water will get heated in a shorter time?
Which is the hottest part in the flame of candle ______.
True or False – If False give the correct answer
All fuels form flame.
Name the unit in which the calorific value of a fuel is expressed?
Magnesium ribbon on burning in air produces
The substance that does not burn with flame is
The substances which gave very ______ ignition temperature and can easily catch fire with a flame are called ______ substances.
Anu wants to boil water quickly in a test tube. On observing the different zones of the flame, she is not able to decide which zone of the flame will be best for boiling water quickly. Help her in this activity.
Match the following for the flame of a candle.
| Column A |
Column B (zone) |
Column C (colour) |
| (a) hottest part | (iii) outer zone of complete combustion | (x) blue |
| (b) moderately hot | (ii) middle zone of partial combustion | (z) yellow |
| (c) least hot | (i) innermost zone of complete combustion | (y) black |
Match the following:
| 1. | Inner zone | a. | Yellow |
| 2. | Outer zone | b. | Borax powder |
| 3. | Middle zone | c. | Blue |
| 4. | Green flame | d. | Black |
