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Physical Quantities and Units

Physics ⇒ Mechanics

Physical Quantities and Units starts at 6 and continues till grade 12. QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Physical Quantities and Units. How you perform is determined by your score and the time you take. When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 10
A block has a mass of 5 kg and a volume of 0.01 m3. What is its density in kg/m3?
A car travels 100 meters in 5 seconds. What is its average speed in m/s?
A force of 10 N is applied to move an object 2 m in the direction of the force. Calculate the work done.
A force of 50 N acts on a body and moves it 4 m in the direction of the force. Calculate the work done.
Define a derived quantity and give one example.
Explain the difference between scalar and vector quantities with one example each.
Explain why units are important in physics.
If the mass of an object is 2 kg and its acceleration is 3 m/s2, what is the force acting on it?
State the SI unit of acceleration.
State the SI unit of force.
A force of 15 N is applied to a body of mass 3 kg. What is the acceleration produced in the body? State the SI unit of acceleration.
A rectangular tank has a length of 2.0 m, a width of 1.5 m, and a height of 1.2 m. Calculate the volume of the tank in SI units and express your answer in scientific notation.
A student measures the length of a rod as 1.25 m and its mass as 2.50 kg. Calculate the ratio of mass to length and state its SI unit.
Explain why the measurement of time is considered a fundamental quantity in physics, and not a derived quantity.
State the difference between accuracy and precision in the context of physical measurements.
A force of 20 N is applied to a body, causing it to move with an acceleration of 4 m/s2. Calculate the mass of the body and state its SI unit.
A rectangular sheet has a length of 3.0 m and a width of 2.0 m. Calculate its area in SI units and express the answer in scientific notation.
A student records the following measurements: mass = 250 g, length = 40 cm, time = 2 min. Convert all these quantities to their respective SI units and write them in scientific notation.
Explain why the unit of speed is considered a derived unit in the SI system. Give its dimensional formula.
The pressure P is defined as force F divided by area A. If the SI unit of force is newton (N) and area is measured in m2, express the SI unit of pressure in terms of base units.