Read the following statements carefully and select the
option that correctly identifies them as true (T) and false (F) ones.
I. During extreme heat of summer, at some places
dry grass catches fire which spreads to trees, and
very soon the whole forest is on fire.
II. Goldsmiths blow the innermost zone of a flame
with a metallic blow-pipe for melting gold and silver.
III. Combustion is a chemical process in which a
substance reacts with carbon dioxide to give
oxygen and heat.
IV. The highest temperature at which a substance
catches fire is called its ignition temperature.
V. Carbon dioxide is used to extinguish fires involving oil and petrol.
| I | II | III | IV | V | |
|---|---|---|---|---|---|
| A | T | T | F | F | T |
| B | F | F | T | T | T |
| C | F | F | F | F | F |
| D | T | F | F | F | T |