81How many base units are there in the International System of Units (SI)?
82Which of these is a derived SI unit rather than a base unit?
83One kilometer is equal to how many meters?
84One kilogram is equal to how many grams?
85Which instrument is used to precisely measure small lengths and internal or external diameters?
86Which instrument is used to measure very small thicknesses or diameters with high precision?
87Which simple instrument is commonly used to measure short time intervals in physics experiments?
88Which instrument is commonly used to measure atmospheric pressure?
89The time period of a simple pendulum mainly depends on its length and what else?
90For small oscillations, the time period of a simple pendulum is independent of what?
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