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Brief Questions and Answers Physics (3 marks each)
1. How physics plays an important role in our life?
2. Estimate your age in minutes and seconds
3. What base quantities are involved in these derived physical quantities; force, pressure, power, and charge?
4. Show that prefix micro is thousand times smaller than prefix milli.
5. Justify that displacement is a vector quantity while energy is a scalar quantity.
6. Screw gauge can give more precise length than vernier calipers. Briefly explain why?
7. Differentiate between mechanical stopwatch and digital stopwatch.
8. How measuring cylinder is used to measure volume of an irregular shaped stone?
9. What precaution should be kept in mind while taking measurement using measuring cylinder?
10. Why do we need to consider significant digits in measurements?
11. How random error can be reduced?
12. Differentiate between precision and accuracy.
13. What is the difference between base quantities and derived quantities? Give three examples in each case.
14. Pick out the base units in the following: joule, newton, kilogramme, hertz, mole, ampere, metre, kelvin, coulomb and watt.
15. Find the base quantities involved in each of the following derived quantities: (a) speed (b) volume (c) force (d) work
16. Estimate your age in seconds.
17. What role SI units have played in the development of science?
18. What is meant by vernier constant?
19. What do you understand by the zero error of a measuring instrument?
20. Why is the use of zero error necessary in a measuring instrument?
21. What is a stopwatch? What is the least count of a mechanical stopwatch you have used in the laboratories?
22. Why do we need to measure extremely small intervals of time?
23. What is meant by significant figures of a measurement?
24. How is precision related to the significant figures in a measured quantity?