Physical Quantities and Units
Physics ⇒ Mechanics
Physical Quantities and Units starts at 6 and continues till grade 12.
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See sample questions for grade 11
A box has a mass of 5 kg. What is its weight on Earth (g = 9.8 m/s2)?
A car travels 100 kilometers in 2 hours. What is its average speed in SI units?
A force of 10 N is applied to a mass of 2 kg. What is the acceleration produced?
A force of 20 N acts on a body and moves it 4 m in the direction of the force. Calculate the work done.
Convert 3600 seconds to hours.
Express 250 cm in meters.
Express 5 kilometers in meters.
State the SI base units for length, mass, and time.
What is the dimensional formula for energy?
What is the dimensional formula for force?
What is the dimensional formula for velocity?
A physical quantity X is given by X = (Force × Distance2) / (Time3 × Mass). What is the dimensional formula for X?
A student measures the length of a rod as 1.25 m using a meter scale with a least count of 0.01 m. What is the percentage uncertainty in the measurement?
A student records the following measurements for the period of a pendulum: 2.01 s, 2.03 s, 2.00 s, 2.02 s, and 2.01 s. Calculate the mean period and the absolute uncertainty.
If the speed of light in vacuum is approximately 3.00 × 108 m/s, express this value in km/h.
State the difference between accuracy and precision in the context of physical measurements.
The Planck constant (h) has the SI unit of joule second (J·s). Express the dimensional formula of h in terms of mass (M), length (L), and time (T).
