1 Burning of candle involves: A Both physical and chemical changes B Only physical change C Only chemical change D No change
2 Burning of wood is an example of: A Chemical change B Physical change C Reversible change D Temporary change
3 Formation of clouds is a: A Physical change B Chemical change C Permanent change D Irreversible change
4 The process in which a substance gains oxygen is called: A Oxidation B Reduction C Sublimation D Condensation
5 Which of the following changes involves absorption of heat? A Melting of ice B Burning of coal C Rusting of iron D Burning of candle
7 The chemical change that takes place when iron is exposed to moist air is: A Corrosion B Combustion C Fermentation D Decomposition
8 A chemical change is also called a: A Chemical reaction B Physical reaction C Reversible reaction D Slow reaction
9 The decomposition of organic matter is a: A Chemical change B Physical change C Reversible change D Temporary change
10 Dissolving sugar in water is a: A Physical change B Chemical change C Irreversible change D Endothermic change
12 Which of the following changes is permanent? A Burning of wood B Melting of ice C Boiling of water D Stretching of rubber
13 During a chemical change, the composition of matter: A Changes B Remains the same C Is temporarily altered D Only changes state
14 Which of these is a reversible change? A Freezing of water B Burning of wood C Cooking of rice D Digestion of food
15 The reaction between iron and copper sulfate solution is a: A Chemical change B Physical change C Reversible change D Fast change
16 A change in which no new substance is formed is called: A Physical change B Chemical change C Irreversible change D Permanent change
17 Which of the following is a chemical change? A Photosynthesis B Evaporation C Condensation D Sublimation
18 Which of the following is a chemical property? A Flammability B Density C Melting point D Solubility
20 Crushing of a can is a: A Physical change B Chemical change C Permanent change D Irreversible change
21 During a physical change, the chemical identity of the substance: A Remains the same B Changes C Is temporarily altered D Becomes unstable
22 A piece of paper cut into small pieces is a: A Physical change B Chemical change C Permanent change D Irreversible change
23 Which of the following is a chemical change? A Digestion of food B Dissolving of salt C Evaporation of oil D Stretching of a spring
24 Making of a clay pot is a: A Physical change B Chemical change C Both physical and chemical D Irreversible change
25 The process of burning of magnesium ribbon is a: A Chemical change B Physical change C Reversible change D Endothermic change