BECE Career Technology past questions and answers

The figure is a rectangle with equally spaced circumference divisions — the surface development of a cylinder. A milk tin is cylindrical, so its body can be rolled from this rectangle — answer A. A funnel is a cone (its development is a sector of a circle), while a match box and a chalk box are rectangular boxes whose developments are multi-panel cross-shaped nets, not a single rectangle with circumference divisions.

The tool shown is a pickaxe, and the part labelled J is its head. The head strikes hard ground repeatedly, so it must be strong, tough and wear-resistant — properties of medium carbon steel. Odum is a hardwood used for the handle, not the head; aluminium is too soft for heavy impact; polyvinyl chloride (PVC) is a plastic and would shatter.

A dimension line is a thin, solid line with arrowheads at both ends (line D) — the arrowheads show the exact extent being measured, and the measurement is written along the line. Line A (short uniform dashes) is a hidden-detail line, line B (alternating long and short dashes) is a centre line, and line C (thick solid) is a visible outline.

In the sketch, the vertical edges of the object remain vertical, but the horizontal edges of BOTH side faces converge towards two separate points on the horizon line (shown by the dashed construction lines). Two sets of converging lines means two vanishing points — the drawing is in two-point perspective. In one-point perspective only one set of edges converges; in isometric and oblique drawings the receding edges stay parallel and never converge.

The tool is a gauge rod (storey rod). Its marks are spaced exactly one course apart, so the bricklayer holds it against the wall to check that every course of blocks rises to a uniform height — that is, it measures the courses of the wall. Checking straightness uses a straight edge, plumbing (checking verticality) uses a plumb bob, and levelling uses a spirit level.

In an isometric drawing, three faces of the object are visible: the top face, the front (left) face, and the side (right) face. Isometric drawings use 30-° angles from the horizontal to show three dimensions of an object in a single view, making them useful for visualising the shape of an object in technical drawing.

In a parallel circuit, each bulb is on its own separate branch. If Bulb A blows, current can still flow through the branch containing Bulb B, so Bulb B will continue to light. This is a key advantage of parallel circuits over series circuits, and it is why household wiring uses parallel circuits.

The diagram shows a series circuit because all the components (battery, switch, Bulb 1, and Bulb 2) are connected in a single loop, one after the other. In a series circuit, current flows through each component in turn. If one bulb blows, the circuit breaks and all components stop working.