IMPORTANT QUESTIONS

1. Q161 Name the battle in which Napoleon was finally defeated.

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2. Q162 Briefly explain the following terms (i) Inundation Canal. (ii) Rooftop rainwater harvesting (iii) Surface water

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3. Q163 The compounds used to prepare NaHCO₃ are:

   • (a) NaCl, NH₃, CO₂, H₂O
   • (b) NaCl, NaOH, CO₂, H₂O
   • (c) Na₂CO₃, H₂O, CO₂ O₂
   • (d) NaCl, Ca(OH)₂, H₂O, CO₂

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4. Q164 Give explaination to each statement: i. Why nasal hair and mucus are present in the nasal chamber? ii. Why trachea does not collapse even when there is no air? iii. Where the exchange of respiratory gases take place? iv. What happens when we breathe in? v. Why the lungs always contain a residual volume of air?

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5. Q165 Write chemical equation for the following word equations: i) Copper + Sulphuric acid →→ Copper sulphate + Sulphur dioxide + water ii) Ammonia + Oxygen →→ Nitric oxide + water iii) Silver nitrate →→ Silver+ Nitrogen dioxide + Oxygen iv) Potassium chlorate →→ Potassium chloride + oxygen v) Aluminium + Hydrochloric acid →→ Aluminium chloride + Hydrogen

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6. Q166 Directions: In the following questions, a statement of assertion (A) is followed by a statement of the reason (R). Mark the correct choice as: (a) Both assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of assertion (A). (b) Both assertion (A) and Reason (R) are true but reason (R) is not the correct explanation of assertion (A). (c) Assertion (A) is true but reason (R) is false. (d) Assertion (A) is false but reason (R) is true. Assertion (A): Valves are present in the arteries. Reason (R): Arteries carry oxygenated blood from the heart to different body parts except for the pulmonary artery.

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7. Q167 Name the component of blood which transports: Food, carbon dioxide, and nitrogenous wastes.

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8. Q168 Predict which of the following elements will form cation and which form anions? (i) Na (ii) Al (ii) Cl (iv) O

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9. Q169 Write the names and one function of each of any three growth hormones in plants.

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10. Q170 An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it? (a) 1 A (b) 2 A (c) 5 A (d) 4 A

    • (a) 1 A
    • (b) 2 A
    • (c) 5 A
    • (d) 4 A

    Medium View solution