Study the flow chart given below.
What could P, Q, R and S be?
| P | Q | R | S | |
| A | Air | Oil | Rubber | Steel |
| B | Alcohol | Air | Iron | Paper |
| C | Carbon dioxide | Water | Steel | Ice |
| D | Water | Oxygen | Ceramic | Oil |
Study the flow chart given below.
What could P, Q, R and S be?
| P | Q | R | S | |
| A | Air | Oil | Rubber | Steel |
| B | Alcohol | Air | Iron | Paper |
| C | Carbon dioxide | Water | Steel | Ice |
| D | Water | Oxygen | Ceramic | Oil |