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

11th Standard

Reg.No. :
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Physics

Time : 00:45:00 Hrs
Total Marks : 30
10 x 3 = 30
1. Distinguish between fundamental and derived units.

2. What are the advantages of the SI system?

3. Explain reductionism with example.

4. How are theoretical predictions useful?

5. How can the systematic errors be minimised?

6. What are systematic errors?

7. A physical quantity Q is found to depend on quantities x,y,z obeying relation Q $={{x^2y^3}\over{z^1}}.$ Th e percentage errors in x, y and z are 2%, 3% and 1% respectively. Find the percentage error in Q.

8. The mass and volume of a body are found to be 4$\pm$0.03 kg and 5$\pm$0.01 m3 respectively. Then find the maximum possible percentage error in density.

9. Calculate the number of times a human heart beats in the life of 100 years old man. Time of one heart beat = 0.8s.

10. Convert a velocity of 72 kmh-1 into ms-1 with the help of dimensional analysis.