Grade :9
Topic Measurements and Experimentation
Marks :40
Question 1
Fill in the blanks. (10)
1. The SI unit pressure is ..................
2. The distance of stars from Earth is generally measured in ................
3. The ................. Of an instrument is the smallest measurements that can be taken accurately.
4. The time period of a Seconds pendulum clock is ..........
5. The unit of time period is ............
6. One light year is .............m
7. Density is Mass is to ...............
8. A ....................... Is a heavy point mass suspended from rigid support.
9. The maximum displacement of the Bob from mean position is ..............
10. A fundamental unit for measuring mass is ............
Question 2.
1. What is unit? (1)
2. State and explain giving example the types of unit dependent on the other unit for measurement. (3)
3. How to choose a unit? (3)
4. Name the three system of units and write the full form. (3)
Question 3.
1. The wavelength of light is 600 nm. What is its wavelength in A°? (1)
2. State and write the principle of
a. Vernier caliper
b. Screw gauge. (2)
3. What are the parts of vernier caliper and write their functions? (4)
4. Screw gauge has error.
a. Name the errors.
b. Explain each error. (3)
Question 4.
1. State the factors that affects the time period of simple pendulum. (3)
2. A simple pendulum completes 80 oscillation in 2 minutes. Find its frequency and time period. (2)
3. Derive the expression for the time period of simple pendulum. (3)
4. Find the length of a seconds pendulum at a place where g= 10m/s2. (2)
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