Question

A. Fill in the blanks. 1. Wax vapors from the candle burns to produce ____________ and___________. 2. Tsunami is an example of ___________change. 3. Curdling of milk is a ________________change. 4. Changes that can be reversed are known as _________________ changes. 5. Chemical changes are ___________________in nature. B. Multiple choice questions. 1. Which type of change is roasting of groundnuts? a. Physical b. Reversible c. Irreversible d. Temporary 2. Changes that are brought by humans are __________. a. natural b. physical c. permanent d. man made 3. Which of the following changes can be reversed? a. cooking of food b. rusting of iron c. burning of wood d. expansion of metals 4. Changes can occur due to ___________. a. heating b. cooling c. pulling d. all of these 5. The process of changing water into water vapors is called ___________. a. sublimation b. condensation c. evaporation d. contraction C. State the following statements as true or false. 1. A metal coaster becoming red hot on heating is a reversible change. __________ 2. Changes can be caused by applying pressure. __________ 3. Occurrence of tsunami is a desirable change. __________ 4. Weathering of rocks is a reversible change. __________ 5. New substances are formed in a physical change. __________ D. Choose the odd one out. 1. a. Evaporation b. Condensation c. Refining d. Melting 2. a. Folding of paper b. Burning of candle c. Souring of milk d. Sublimation 3. a. Growth of plants b. Cutting of trees c.Ripening of fruits d. Stretching of rubber band 4. a. Expansion b. Contraction c. Freezing d.Rusting 5. a. Making coffee b. Roasting c. Melting of chocolate d. Baking cake E. Answer the following. 1. Give two examples of physical changes which are irreversible also. _________________________________________________________________________________. 2. Why tearing of paper is a physical change? _________________________________________________________________________________.

Answer 1

Answer:

1. carbon dioxide and water vapour

2. natural changes

3. chemical change

4.physical changes

5. permanent