Chapter 1: Physical Quantities and Measurement

Comprehensive Questions & Answers for SSC-I Physics (Rawalpindi Board)

Short Questions

Q1: What is measurement?

Ans: Measurement is the comparison of an unknown quantity with a known standard quantity of the same kind.

Q2: What are physical quantities?

Ans: Physical quantities are measurable quantities like length, mass, time, and temperature.

Q3: Define base quantities.

Ans: Base quantities are those that do not depend on other quantities, e.g. length, mass, and time.

Q4: Define derived quantities.

Ans: Derived quantities depend on base quantities, such as velocity, acceleration, and force.

Long Questions

Q1: Differentiate between scalar and vector quantities.

Ans: Scalar quantities have only magnitude while vector quantities have both magnitude and direction.

Q2: Explain base and derived quantities with examples.

Ans: Base quantities are fundamental like length, mass, and time. Derived quantities are obtained from base quantities, e.g., velocity = distance/time.