Consider the following comparisons of the petrol engines and diesel engines:
1. Petrol engines have spark plugs , diesel engines have no spark plugs
2. In petrol engines the mixture of air and petrol is drawn in by the falling piston, in diesel engines only air is drawn in by the falling piston
3. In petrol engines the mixture of air and petrol is compressed, in diesel engines only air is compressed
Which among the above is / are correct statements?

Answer: [D] 1, 2 & 3

This question is a part of GKToday's Integrated IAS General Studies Module