Exercise Solutions Available
Step-by-step answers for all textbook questions in this chapter
Instructions
- Time: 1 hour 30 minutes
- Maximum Marks: 50
- Answer all sections.
Section A — One Mark (10 × 1 = 10 marks)
1. Write the SI unit of pressure. 2. Define least count. 3. State Archimedes' principle. 4. Convert 27°C to Kelvin. 5. Which mode of heat transfer occurs through fluids? 6. State the first law of reflection. 7. Name the type of lens used to correct short-sightedness. 8. State Ohm's law. 9. What is resistance? Give its SI unit. 10. Name one device that works on the heating effect of current.
Section B — Short Answer (5 × 3 = 15 marks)
Answer any five:
11. Explain the three modes of heat transfer. 12. State the laws of reflection. Draw a diagram showing reflection from a plane mirror. 13. Distinguish between contact and non-contact forces with examples. 14. Calculate the current if V = 15 V and R = 5 Ω. 15. Compare concave and convex mirrors with their uses. 16. Explain how pressure depends on force and area with two examples from daily life. 17. Explain the heating effect of current. Give two applications.
Section C — Long Answer (5 × 5 = 25 marks)
Answer all:
18. (a) Explain Archimedes' principle. Describe a simple experiment to verify it. Write two practical applications. OR (b) Explain the working of a vernier calliper. How is the final reading determined?
19. (a) Explain the three modes of heat transfer with diagrams and daily-life examples. OR (b) Explain the types of mirrors. How is image formed in a concave mirror when the object is at the centre of curvature?
20. (a) Explain series and parallel circuits. Give formulae for total resistance in each arrangement. OR (b) Explain refraction of light. State laws of refraction. How does a convex lens converge light?
Correction Checklist
- [ ] Units written for all numerical answers
- [ ] All diagrams labelled
- [ ] Formulae stated correctly
- [ ] Textbook keywords included in descriptive answers