Question

12. Any three examples of solid fuels.
1. For the combustion reaction temperature of contribute material should be (1)
Lower than the ignition temperature. (i) Higher than the ignition temperature. (iii
les of gaseous fuels.
13. Different zones of candle flame.
14. Process of production of energy in sun.
Tick the correct answer:
Equal to the ignition temperature. (iv) None of the above.
2. Which one is an example of combustible substance.
(i) Natural gas (ii) Glass pieces (in) Iron nails (iv) None of the above.
3
. Who were the people who introduced match sticks?
(i) Indians (ii) Americans (iii) Egyptians (iv) British
4. Which of the following is having highest calorific value?
(i) Methane gas (ii) Biogas (in, Hydrogen gas (iv) CNG (Compressed Natura
5. Which of the following gas causes death if inhaled in large amounts?
(i) Carbon dioxide gas (ü) Carbon monoxide gas (ii) Nitrogen dioxide ga
Sulphur dioxide gas
6. In which zone of candle flame a partial combustion of wax vapour
(i) Dark inner zone (ii) Blue zone (iii) Luminous zone (iv) Nonlumino​

Answer 1

Answer:

ques 2 ans 1 is correct hope it helps