Tools & Precision Measuring Instruments is one of 9 topics in the Grade 12 Mechanical Technology CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. What does a depth micrometre measure?
The depth of a hole, slot or step relative to a reference surface
The outside diameter of a round bar
The effective diameter of a screw thread
The angle between two surfaces
Answer: The depth of a hole, slot or step relative to a reference surface — A depth micrometre measures the depth of a hole, slot or step relative to a reference surface, using a base that rests flat on the surface and a spindle that extends into the recess.
Easy
2. What is a screw thread micrometre specifically designed to measure?
The effective (pitch) diameter of a screw thread
The depth of a blind hole
The hardness of a material surface
The torque applied to a fastener
Answer: The effective (pitch) diameter of a screw thread — A screw thread micrometre has a pointed spindle and V-shaped anvil shaped to sit in a thread's profile, allowing direct measurement of the thread's effective (pitch) diameter.
Medium
3. Name the tool used with a bore, extended to press against its sides and then withdrawn to be measured externally with a standard micrometre.
Answer: telescopic gauge — A telescopic gauge is extended to press against the sides of a bore, then locked and withdrawn to be measured with a standard outside micrometre.
