Workshop Practice and Practical/Sessional Subjects
What is assessed
Workshop practice covers hand tools and their correct use, marking and measuring instruments, carpentry joints, fitting operations, sheet-metal development, welding processes, foundry and smithy basics, and machine-shop operations on lathe and drilling machines. Sessional subjects assess lab report writing, observation and calculation, error analysis, circuit or specimen handling, and safety compliance. Examiners look for procedural order, tool selection, and safety awareness as much as the final result.
Traps that recur
Questions frequently probe the correct instrument for a task: a vernier caliper for external and internal diameters, a micrometer for precision thickness, a try square for squareness, a surface plate for flatness reference. Candidates confuse least count values, forget to add the zero error correction, or state that a hacksaw blade is fitted with teeth pointing backward. In welding, electrode angle and arc length are commonly reversed. In lab reports, the difference between systematic and random error, and between accuracy and precision, is often muddled. Safety questions penalise omission of personal protective equipment.
Worked example
A vernier caliper has 1 mm main-scale divisions and 50 vernier divisions. Least count = 1/50 = 0.02 mm. If the main scale reads 12 mm and the 23rd vernier division coincides, the reading is 12 + 23 × 0.02 = 12.46 mm. Rule of thumb: least count equals the smallest main-scale division divided by the number of vernier divisions.
Practice habit
Rehearse the sequence of each operation aloud, including the safety check, before writing it in the answer script.