Question

a) Define measurement. (2)

b) Convert 1 mean solar day into seconds. (2)

c) A body measures 25 m. State the unit and the magnitude of physical quantity

in the statement. (2)

d) Draw a neat diagram of a simple pendulum. Show on it the effective length of the pendulum

and its oscillation. (2)

e) The time periods of two pendulums are 3 s and 4 s respectively. Find the ratio of their

lengths.​

Answer 1

Answer:

1. Measurement, the process of associating numbers with physical quantities and phenomena. ... Measurement is fundamental to the sciences; to engineering, construction, and other technical fields; and to almost all everyday activities.
2. A measure of time representing the interval between consecutive passages of the Sun across the meridian, averaged over one year. 1 day = 24 hr (86,400 sec).
3. Its unit is metre and it's magnitude is 25.
4. A simple pendulum consists of a mass less string with which a small bob is attached. This is attached at another end to a rigid support. If the air drag is negligible, then the pendulum keeps oscillating between two points of maximum displacement. At the lowest point, the velocity is maximum. This follows from conservation of energy.
5. 1 : 4

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