Physical quantities Knowledge-Based Download PDF

Questions

1. 1.

   Which of the following pairs of physical quantities have the same dimensions?

   • A) Work and torque
   • B) Force and pressure
   • C) Momentum and kinetic energy
   • D) Power and work
2. 2.

   For a fixed physical quantity, how is its numerical value related to the magnitude of the unit used to express it?

   • A) It is directly proportional to the magnitude of the unit.
   • B) It is independent of the magnitude of the unit.
   • C) It is inversely proportional to the magnitude of the unit.
   • D) It is directly proportional to the square of the magnitude of the unit.
3. 3.

   Which of the following is an example of a dimensionless physical quantity?

   • A) Electric potential
   • B) Frequency
   • C) Refractive index
   • D) Surface tension
4. 4.

   Which of the following conditions must be met in order to add or subtract two physical quantities directly?

   • A) They must both be base quantities.
   • B) They must have the same numerical magnitude.
   • C) They must represent the same kind of physical quantity.
   • D) They must both be scalar quantities.
5. 5.

   Which of the following is sufficient to completely specify a scalar physical quantity?

   • A) A numerical magnitude, a unit of measurement, and a spatial direction
   • B) A numerical magnitude and an appropriate unit of measurement
   • C) A spatial direction and a coordinate frame origin
   • D) A fundamental physical constant and an experimental error margin
6. 6.

   Which of the following is a physical quantity rather than a unit of measurement?

   • A) Ampere
   • B) Kelvin
   • C) Energy
   • D) Meter
7. 7.

   Which of the following characteristics defines a property of an object or system as a physical quantity?

   • A) It can only be described through subjective human perception.
   • B) It must have an assigned spatial direction to be defined.
   • C) It must remain conserved and unchanged during all physical interactions.
   • D) It can be measured objectively and expressed as a numerical value with a reference.
8. 8.

   Which of the following best defines a derived physical quantity?

   • A) A quantity that cannot be defined in terms of other physical quantities
   • B) A quantity that requires both a numerical magnitude and a directional reference
   • C) A quantity whose numerical value remains constant regardless of the unit system
   • D) A quantity that is expressed through mathematical combinations of base quantities
9. 9.

   Which of the following physical quantities is classified as a vector quantity?

   • A) Speed
   • B) Temperature
   • C) Electric charge
   • D) Velocity
10. 10.

    Which of the following physical quantities is classified as a fundamental (base) quantity in the International System of Units (SI)?

    • A) Force
    • B) Electric current
    • C) Velocity
    • D) Energy