CBSE Class 10 Science 2020 · Paper 31/1/1 · Question 12
Incomplete combustion of coal and petroleum :
(A) increases air pollution.
(B) increases efficiency of machines.
(C) reduces global warming.
(D) produce poisonous gases.
The correct option is :
- (a)(A) and (B)
- (b)(A) and (D)
- (c)(B) and (C)
- (d)(C) and (D)
Answer
(b) (A) and (D)
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