Chapter 1: Measurements

Which of the following is the shortest length?

• $8000\ \mu m$
  

• 800 mm

• 0.0080 km

• 8.00 cm

• A

• B

• C

• D

A pipe has an approximate length of 60 cm and an approximate internal diameter of 3 cm.

Which instruments are the most suitable for measuring accurately the internal diameter and the length?

• calipers and micrometer

• calipers and rule

• rule and micrometer

• rule and tape

• 5.64 mm

• 7.14 mm

• 7.16 mm

• 7.64 mm

• 5.22 mm

• 5.32 mm

• 5.72 mm

• 6.22 mm

• from X to Y

• from X to Z

• from X to Z and back to X

• from X to Z and back to Y

Which of the following will cause the period of a pendulum to be doubled?

• Doubling the length

• Doubling the mass

• Doubling the acceleration of free fall

• Increasing the length by a factor of 4

A pendulum clock is found to be slow.

How should the clock be adjusted to measure the time correctly?

• by increasing the mass of its pendulum bob

• by increasing the amplitude of oscillation of its pendulum

• by increasing the length of its pendulum

• by decreasing the length of its pendulum