General science

14 chapters 16 solved questions

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Chapters

1. 1 Motion and force
2. 2 Work, energy and power
3. 3 Gravitation
4. 4 Light 2 Q
5. 5 Sound and heat
6. 6 Electricity and magnetism 2 Q
7. 7 Atoms and the periodic table 1 Q
8. 8 Acids, bases and salts 3 Q
9. 9 Metals and non-metals
10. 10 Carbon and its compounds 1 Q
11. 11 Cell and tissues
12. 12 Human body systems 3 Q
13. 13 Nutrition and diseases 3 Q
14. 14 Plants and heredity 1 Q

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• What is the pH of pure water at 25\(^\circ\)C? Answer: D. 7 Answer: (D) 7 Pure water is neutral; at 25°C its pH is 7. Below 7 is acidic and above 7 is basic. Acids, bases and salts 1 answer
• Which blood components help in the clotting of blood? Answer: B. Platelets Answer: (B) Platelets Platelets (thrombocytes) gather at a wound and release factors that start clotting. RBCs carry ox... Human body systems 1 answer
• Which type of lens is used to correct myopia (short-sightedness)? Answer: C. Concave lens Answer: (C) Concave lens In myopia the image forms in front of the retina. A concave (diverging) lens moves it back... Light 1 answer
• The loss of water in the form of vapour through the stomata of leaves is called: Answer: A. Transpiration Answer: (A) Transpiration Transpiration is the loss of water vapour mainly through stomata. Guttation is the loss o... Plants and heredity 1 answer
• What is the chemical formula of Plaster of Paris? Answer: D. CaSO ₄ ·½H ₂ O Answer: (D) CaSO ₄ ·½H ₂ O Plaster of Paris is calcium sulphate hemihydrate, CaSO ₄ ·½H ₂ O, made by heating gypsu... Acids, bases and salts 1 answer
• What is the SI unit of electric current? Answer: B. Ampere Answer: (B) Ampere Electric current is measured in amperes (A), one of the seven SI base units. Volt is the unit of potent... Electricity and magnetism 1 answer