Science Practice Quiz 173

Q1.Based on the information provided, what type of change is neutralisation, where an acid is reacted with a base?

A. A physical change B. A reversible change C. A chemical change D. A phase change

Q2.Which of the following correctly represents the chemical equation for rusting?

A. Fe + O2 → FeO B. Fe + H2O → Fe(OH)2 C. Iron (Fe) + Oxygen (O2) + water (H2O) → rust (iron oxide Fe2O3) D. Fe + CO2 + H2O → FeCO3

Q3.What two conditions are essential for the process of rusting to occur?

A. Presence of carbon dioxide and heat B. Presence of nitrogen and sunlight C. Presence of both oxygen and water (or water vapour) D. Presence of only oxygen

Q4.Which of the following methods is suggested in the text to prevent iron articles from rusting?

A. Exposing them to direct sunlight B. Storing them in a vacuum C. Applying a coat of paint or grease regularly D. Heating them to a high temperature

Q5.Besides applying paint or grease, what other method is mentioned for preventing rusting by depositing a protective layer on iron?

A. Depositing a layer of copper or silver B. Depositing a layer of a metal like chromium or zinc C. Depositing a layer of plastic or rubber D. Depositing a layer of aluminum or lead

Q6.What is the primary function of the ozone layer in our atmosphere?

A. To regulate Earth's temperature B. To reflect radio waves C. To protect us from harmful ultraviolet radiation D. To absorb infrared radiation

Q7.Which of the following biological processes, mentioned in the text, are considered chemical changes?

A. Only photosynthesis B. Only digestion C. Both photosynthesis and digestion D. Neither photosynthesis nor digestion

Q8.What is the process of depositing a layer of zinc on iron called?

A. Rusting B. Crystallisation C. Galvanisation D. Oxidation

Q9.What is the primary purpose of galvanising iron pipes used in homes to carry water?

A. To make them more flexible B. To prevent rusting C. To increase their electrical conductivity D. To enhance their aesthetic appeal

Q10.How does the presence of salt water affect the process of rust formation on iron, particularly for ships?

A. It slows down the process B. It stops the process completely C. It makes the process faster D. It has no effect on the process

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Science Practice Quiz 173