What are Physical Quantities? Distinguish Between Base and Derived Physical Quantities.

A physical quantity is any measurable property of an object or phenomenon that can be described using a numerical value and a unit. Examples include length, time, mass, temperature, and force.

  • Base Physical Quantities: These are fundamental quantities that cannot be defined in terms of other quantities. They are independent and form the foundation for other physical quantities. The seven base quantities in the International System of Units (SI) are:

    • Length (meter)
    • Mass (kilogram)
    • Time (second)
    • Electric current (ampere)
    • Temperature (kelvin)
    • Amount of substance (mole)
    • Luminous intensity (candela)

  • Derived Physical Quantities: These quantities are derived from the base quantities using mathematical relationships. They are dependent on the base quantities. Examples include:

    • Speed: Derived from length (meters) and time (seconds). Speed=Distance/Time
    • Force: Derived from mass (kilograms) and acceleration (meters per second squared). Force=Mass×Acceleration
    • Energy: Derived from force (newtons) and distance (meters). Energy=Force×Distance

Related Questions:

  1. Define physics. Describe its revolutionary role in technology.
  2. List and briefly describe different branches of physics.
  3. What are Prefixes? What is their Use in Measurements?
  4. Dynamics-1
  5. Dynamics-II
  6. Pressure and Deformation in Solids
  7. Work and Energy
  8. Density and Temperature
  9. Magnetism
  10. Q.1 How does physics play an important role in our life?
  11. Q.2 Estimate your age in minutes and seconds.
  12. Q.3 What base quantities are involved in these derived physical quantities; force, pressure, power and charge.
  13. Q.4 Show that prefix micro is thousand times smaller than prefix milli.
  14. Q5. Justify that displacement is a vector quantity while energy is a scalar quantity.
  15. Q6. Screw gauge can give more precise length than vernier calipers. Briefly explain why?
  16. Q.7 Differentiate between Mechanical Stopwatch and Digital Stopwatch.
  17. Q.8 How measuring cylinder is used to measure the volume of an irregularly shaped stone?
  18. Q.9 What precautions should be kept in mind while taking measurements using a measuring cylinder?
  19. Q.10 Why do we need to consider significant digits in measurements?
  20. Q11. How random error can be reduced?