Class 9 Physics: One-Word/Term Answers on Measurements
1. A quantity that cannot be expressed in terms of other physical quantities.
Fundamental Quantity
2. The SI unit of electric current .
ampere
3. A quantity obtained by multiplying or dividing fundamental quantities.
Derived Quantity
4. The smallest value that can be measured by a vernier callipers.
Least Count
5. Instrument used to measure the diameter of a small spherical object like a ball bearing.
Screw Gauge
6. Advance the screw by turning it till the object is gently held between the stud and the spindle of the screw.
Ratchet
7. The formula to find the least count of a screw gauge.
Pitch ÷ No. of divisions on circular scale
8. The time for one complete oscillation of a pendulum.
Time Period
9. The formula to find time period of a simple pendulum.
T = 2Ï€√(l/g)
10. The SI unit of Amount of substance.
mole
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