Calorific Value MCQs Class 8
Calorific Value MCQs Class 8
Class: CBSE Class 8
Subject: Science
Section: Section 6 – Combustion and Flame
Topic: Calorific Value MCQs
Board: CBSE Board Examinations
Subject: Science
Section: Section 6 – Combustion and Flame
Topic: Calorific Value MCQs
Board: CBSE Board Examinations
1. Calorific value of a fuel is defined as:
Answer: b) Heat produced by burning 1 kg fuel
Calorific value measures energy content of fuel. Higher calorific value means more heat produced per kg.
Calorific value measures energy content of fuel. Higher calorific value means more heat produced per kg.
2. Unit of calorific value is:
Answer: b) kJ/kg
It represents kilojoule heat energy released by 1 kilogram fuel.
It represents kilojoule heat energy released by 1 kilogram fuel.
3. Which fuel has highest calorific value?
Answer: c) Hydrogen
Hydrogen has extremely high calorific value and burns cleanly forming water.
Hydrogen has extremely high calorific value and burns cleanly forming water.
4. A good fuel should have:
Answer: b) High calorific value
More energy output makes fuel efficient.
More energy output makes fuel efficient.
5. LPG calorific value is approximately:
Answer: c) 55,000 kJ/kg
LPG has high calorific value making it an efficient domestic fuel.
LPG has high calorific value making it an efficient domestic fuel.
6. Wood has calorific value around:
Answer: a) 17,000 kJ/kg
Wood produces less heat compared to LPG or petrol.
Wood produces less heat compared to LPG or petrol.
7. Fuel efficiency depends on:
Answer: b) Calorific value
Higher calorific value → more efficient fuel.
Higher calorific value → more efficient fuel.
8. Petrol calorific value is about:
Answer: a) 45,000 kJ/kg
Petrol is a high‑energy liquid fuel.
Petrol is a high‑energy liquid fuel.
9. Which fuel has lowest calorific value?
Answer: d) Cow dung cake
It produces less heat and more smoke.
It produces less heat and more smoke.
10. CNG calorific value is nearly:
Answer: a) 50,000 kJ/kg
CNG is a clean fuel with high calorific value.
CNG is a clean fuel with high calorific value.
11. High calorific value fuel produces:
Answer: b) More heat
Energy output increases with calorific value.
Energy output increases with calorific value.
12. Calorific value is measured using:
Answer: b) Calorimeter
It measures heat energy released during combustion.
It measures heat energy released during combustion.
13. Best domestic fuel is:
Answer: b) LPG
High calorific value and clean burning make LPG ideal.
High calorific value and clean burning make LPG ideal.
14. Coal calorific value is nearly:
Answer: a) 25,000 kJ/kg
Coal produces moderate heat.
Coal produces moderate heat.
15. Which fuel is future clean fuel?
Answer: b) Hydrogen
Produces water on burning.
Produces water on burning.
16. Fuel with high calorific value saves:
Answer: d) All
Efficient fuels reduce consumption and cost.
Efficient fuels reduce consumption and cost.
17. Kerosene calorific value is about:
Answer: a) 48,000 kJ/kg
Kerosene is an efficient liquid fuel.
Kerosene is an efficient liquid fuel.
18. SI unit of heat energy is:
Answer: a) Joule
Calorific value uses kilojoule.
Calorific value uses kilojoule.
19. Which produces more pollution?
Answer: c) Coal
Coal emits smoke and harmful gases.
Coal emits smoke and harmful gases.
20. Ideal fuel must have:
Answer: d) All of these
Ideal fuel combines efficiency, safety and cleanliness.
Ideal fuel combines efficiency, safety and cleanliness.