Measurement and Base Quantities Concepts

The video tutorial by Timothy from Cognito Academy covers physical quantities, units, and measurements. It explains the difference between base and derived quantities, introduces the concept of prefixes, and demonstrates how to measure length and time using various instruments. The video also addresses common errors in measurement and provides tips for improving accuracy. The tutorial concludes with a summary and encourages viewers to engage with the channel.

What is a base quantity?

• A quantity that changes with temperature

• A quantity derived from other quantities

• A fundamental quantity not defined by other quantities

• A quantity that is always constant

Which of the following is NOT a base quantity?

• Time

• Mass

• Length

• Volume

How is a derived quantity formed?

• By subtracting one base quantity from another

• By combining two or more base quantities

• By dividing a base quantity by a constant

• By adding two base quantities

What does the prefix 'kilo' represent?

• 10 to the power of 5

• 10 to the power of 4

• 10 to the power of 3

• 10 to the power of 2

Which prefix is used for 10 to the power of -6?

• Centi

• Milli

• Micro

• Nano

What is the precision of a typical ruler?

• 0.01 mm

• 0.1 mm

• 1 mm

• 1 cm

Which instrument is best for measuring objects less than 2.5 cm with high precision?

• Ruler

• Vernier caliper

• Micrometer screw gauge

• Tape measure

What is parallax error?

• An error due to the observer's angle

• An error due to temperature changes

• An error due to faulty equipment

• An error due to incorrect calibration

How is the period of a pendulum defined?

• The time for one complete swing

• The time for two complete swings

• The time for a quarter swing

• The time for half a swing

Why do we measure the time for 20 periods of a pendulum?

• To make the experiment more complex

• To reduce the percentage error

• To increase the total time measured

• To account for equipment errors