Class 9 Units and Measurement set 3 Full mark 30

 A. All question marks 2 (any 5)

1. What is a simple pendulum? Is the pendulum used in a pendulum clock as a simple pendulum? Give reason to your answer.

2. Define the terms: (i) oscillation, (ii) amplitude, (iii) frequency and (iv) time period as related to a simple pendulum.

3. Name two factor where time period of simple pandulam not depends.

4. Compare the time period of two pendulum having length 1m and 9m

5. Establishe the relation between frequency and time period

6. A Bob made of ice if ice start melting what is the change of its time period

B. All questions 3 Marks ( any 5)

1. How T related to L draw diagram and find value of g

2. Defination (any four) : unit, measurement, wave length, persec, AU

3. Differcence between Fundamental unit and derived unit with example

4. How are the derived unit related to fundamental unit (any 3)

Newton, watt, joule, pascal, erg

5. Distance of andromeda galaxy is 6 x 10^22 km. If you see that galaxy from earth how old the galaxy is being seen.

6. How to choose a unit 

C. All question 1 marks (any 5)

1. 5700 Angstrom =                      nm

2. 3 persec =                     light year

3. 1 solar day =                s

4. Corona virus size 50 to 200 nm what is this size in micro metres

5. Light year is the unit of _______________ its value _____________

6. Unit of luminous intensity is ___________________