QUESTION PAPER 3 – 2010

Class – X (GSEB)

Subject - Science (Ch-1, Introduction to nanotechnology, Ch-2, Light-

Reflection and refraction, Ch-3, Dispersion of light and optical

instruments, Ch-4, Electricity, Ch-5, Magnetic effect of electric current)

Time: 1 Hour Max. Marks: 30

Date:

SECTION – A (Multiple Choice Questions – 1 mark each) [5]

1. What is the diameter of a bucky ball? (a) 1 A0 (b) 10 A0 (c) 1 nm (d) 10 nm2. For spherical mirrors which one of the following is true? (a) R = 2f (b) R = f/2(c) R = f (d) R = 4f3. What is splitting of white light in to seven colors is known as? (a) Refraction (b) Reflection (c) Interference (d) Dispersion4. At any point in series connection, which of the following is true? (a) Voltage is same (b) Current is same (c) Voltage and current both are same (d) Voltage and current are not same5. Who gave the law of electric induction? (a) Faraday (b) Oersted (c) Ampere (d) Volta

SECTION – B (Very short answers – 1 mark each) [5]

6. Write the right hand thumb rule.7. Define electric current and write its unit.8. What is near sightedness? How is it corrected?9. Sate the Snell’s law.10. What are the full forms of STM and AFM?

SECTION – C (Short answers – 2 marks each) [6]

11. State the laws of refraction.12. Differentiate between A.C. and D.C. current.13. Write Ohm’s law and its formula.

SECTION – D (Short answers – 3 marks each) [9]

14. Explain parallel connection of resisters and derive equation of resultant resistance.15. Write a short note on Mirage.16. Write working of electric generator and its applications.

SECTION – E (Long answers – 5 marks each) [5]

17. Derive either lens formula or mirror formula .

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