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#### Nature of Physical World and Measurement Two Marks Questions

11th Standard

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Physics

Time : 00:45:00 Hrs
Total Marks : 30
15 x 2 = 30
1. Why is it convenient to express the distance of stars in terms of light year (or) parsec rather than in km?

2. Show that a screw gauge of pitch 1 mm and 100 divisions is more precise than a vernier caliper with 20 divisions on the sliding scale.

3. What is Physics?

4. What is mechanics?

5. What are the things needed to express the measurement of a physical quantity?

6. Name the prefixes for powers of ten with its symbol.

7. What do you mean by unification and reductionism.

8. What is Classical mechanics?

9. How Physics is related to technology and define technology with respect to Physics.

10. In what ways physics is in relation to astronomy?

11. What is meant by parallax.

12. The Moon subtends an angle of 10 55' at the base line equal to the diameter of the earth. What is the distance of the Moon from the Earth? (Radius of the Earth is 6.4 x 106m)

13. A RADAR signal is beamed towards a planet and its echo is received 7 minutes later. If the distance between the planet and the Earth is 6.3 x 1010m. Calculate the speed of the signal.

14. Round off the following numbers as indicated 19.45 up to 3 digits

15. Round off the following numbers as indicated 101.55 x 106 up to 4 digits