2 The particles of gas move: A Very slowly B In fixed positions C Freely and randomly D Only up and down
3 The use of fire helped early humans mainly in: A Writing books B Cooking and metal extraction C Making laws D Developing atomic theory
4 The law of conservation of mass states that mass is: A Created B Destroyed C Neither created nor destroyed D Always increased
5 Robert Boyle emphasized chemistry should be based on: A Magic B Observation and experiments C Alchemy only D Philosophy
6 Lavoisier helped in developing: A Modern chemical nomenclature B Astrology C Electronics D Quantum mechanics
7 Lavoisier explained the role of: A Nitrogen in burning B Oxygen in combustion C Hydrogen in rusting D Carbon in respiration
11 Which of the following is a chemical change? A Breaking glass B Melting wax C Burning paper D Freezing water
12 Which field laid the foundation for laboratory equipment? A Physics B Alchemy C Biology D Geography
13 Which law was proposed by Lavoisier? A Law of multiple proportions B Law of conservation of mass C Law of definite proportions D Boyle’s law
14 The idea that matter is made of tiny particles came from: A Early philosophers B Modern computers C Industrial revolution D Genetics
15 Which change involves formation of a new substance? A Melting of ice B Boiling of water C Rusting of iron D Freezing of water
18 Alchemy mainly used which type of knowledge? A Scientific B Experimental C Mystical D Mathematical
19 Liquids can be poured because: A They have fixed shape B They have fixed volume C Their particles can move D They are compressible