Question

4. Which of the following is a combustible substance.
(a) wood
(b) Marble
(c) platinum
5. The temperature of the middle zone of the candle flame is about
(d) 1400 C
(a) 800 C
(b) 1000 C
(c) 1200 C
6. Which gas gives a pollution free environment when burnt ?
(d) Bio gas
(a) Dung cake
(C) wood
(b) kerosene
7. The substance which have high calorific value
(d) coal gas
(C) oxygen
(a) LPG
(b) Hydrogen
8. Which of the following causes acid rain
(d) oxide of sulpher
(a) carbon dioxide
(b) sulpher dioxide (c) carbon dioxide
9. The zone of candle flame which of moderately got is called
(d) Lowest b
(a) Non luminious zone (b) luminous zone (c) Inner dark zone
10. Which of the following is supporter of combustion
(d) NO
(c) 02
(a) CO2
(b) CO​

Answer 1

Answer:

5question ans is 1200 c

Answer 2

Answer:

4)-a

5)-b

6)d

7)a

8)b

9)b

10)c