Understanding Physical Quantities and Measurement

The video tutorial explains physical quantities, which are measurable and consist of a numerical magnitude and a unit. It categorizes them into base and derived quantities, with examples of each. The tutorial introduces the SI system of units, detailing the base units for seven fundamental quantities and how derived units are formed. It also covers various measuring tools like meter rules, vernier calipers, and screw gauges, emphasizing accuracy and the importance of understanding zero error.

What are the two essential properties a quantity must have to be considered a physical quantity?

• Numerical magnitude and unit

• Numerical magnitude and direction

• Direction and speed

• Unit and direction

Which of the following is NOT a base quantity?

• Length

• Time

• Velocity

• Mass

What is the name of the universally adopted system of units for physical quantities?

• Customary System

• Metric System

• SI System

• Imperial System

Which unit is used to measure electric current in the SI system?

• Ohm

• Ampere

• Volt

• Watt

How is the unit for force expressed in terms of base units?

• Kilogram meter per second

• Meter kilogram per second squared

• Kilogram per meter second squared

• Meter per second

Which of the following is a derived quantity?

• Time

• Acceleration

• Mass

• Temperature

What is the least count of a meter rule?

• 1 centimeter

• 1 millimeter

• 0.1 millimeter

• 0.01 millimeter

Which tool is used to measure small lengths with greater accuracy than a vernier caliper?

• Ruler

• Screw gauge

• Measuring tape

• Meter rule

What is the least count of a screw gauge?

• 0.1 millimeter

• 0.001 millimeter

• 1 millimeter

• 0.01 millimeter

Why is it important to find the zero error in a vernier caliper?

• To decrease the measurement time

• To correct the obtained readings

• To ensure the tool is calibrated

• To increase the range of measurement