Mid-sem prep · graphics questions · Oct 2025 paper
The graphics half of the 2025 mid-sem, drawn step by step
Q7, Q8 and Q10 of the 11 Oct 2025 mid-test — the three graphics types in this year's mid-sem scope. Each question is quoted as set, then built line by line in the order you would draw it with a pencil. Use the Next ▶ button under each drawing.
The paper had 12 questions of 5 marks each. Q1–Q6 are manufacturing (CNC part programs, lasers, materials, hand tools) and are not covered on this page. Q7–Q12 were graphics. This year's mid-sem covers only three of those types: Q7 (missing view), Q8 (missing lines) and Q10 (sectional view) — so only those are on this page. Each is a "complete the drawing" task: you are given most of the picture and finish it. That makes these the most predictable marks on the paper. Each type below has a fixed routine, and the routine is what earns the marks.
New to projections? Read the basics first. It covers views, first angle, missing lines and sections in one page.
Where the marks went
| Q | Type | What you draw | Lecture | Marks |
|---|---|---|---|---|
| Q7 | Missing view | The side view, from the front and top views | L4–L5 orthographic | 5 |
| Q8 | Missing lines | 8 hidden lines across three views | L5 orthographic | 5 |
| Q10 | Section | Sectional front view, hatched | L12 sections | 5 |
About 7 minutes per 5-mark question. Graphics takes longer than the short-answer manufacturing questions, so bank time there first. Suggested graphics order: missing lines first (quickest — a checklist per hole and step), then the sectional view, then the missing view, which carries the most construction.
On every drawing: thin, light construction and projector lines; thick final lines; dashed hidden lines; label every point (a′ in the front view, a in the top view). Labels and projectors show the method. Leave them in.
🎧 Watch it first: first angle or third angle? — a narrated walkthrough (about 4 min, sound on). It folds the planes in front of you, then shows both clues on Q7 and Q8.
The paper doesn't print the projection symbol, so check it against the isometric. Q7 and Q8 are drawn in third angle: the top view sits above the front view and the side view sits to its left. Your L5 lecture examples use first angle, where the top view goes below. Two clues prove it:
Clue 1 (Q7): where the object's front shows up. The isometric has a step at the front: the two front corners drop from 40 to 20 mm for the first 15 mm of depth. In the view above the front view, that step is the line 15 mm from the bottom edge. In the view to the left, the 15-wide step is on the right edge. Both are the edges next to the front view. In third angle the side of each view nearest the front view is the object's front; in first angle it's the back.
Clue 2 (Q8): what's hidden. The base has an 80 mm channel underneath. In the view above the front view, the channel walls are dashed. From below they'd be visible and drawn solid, so this view is looking down: it's a top view placed above the front view, which only happens in third angle.
The rule that works either way: pick one feature you can find on the isometric (a step, slot or hole). Check which side of each given view it appears on, then draw the missing view the same way round. If the paper prints the projection symbol (two circles beside a truncated cone), that settles it at once. Otherwise the given views fix where the missing one goes — don't fight them.
The paper
As set. Birla Institute of Technology and Science, Pilani – Hyderabad Campus · First Semester 2025–2026 · Introduction to Engineering Design and Prototyping (BITS F103) · Date: 11.10.2025 · Mid-Test · Duration: 90 Min · Weightage: 20% · Max. Marks: 60.
Notes: Write the answers to the point. Each question carries Five marks. Answer each question in the space provided below the respective question. All dimensions are in millimeters.
Q7 · The missing side view · 5 marks
Q7. Draw the missing side view of the object shown in the figure below
With it: an isometric drawing of a stepped block (40 tall, 50 wide, 35 deep; a 10-wide slot, a 10-high tunnel underneath, a 15 × 20 step at the front) with a viewing arrow, plus the front view and the top view.
Given: front view (50 × 40) and top view (50 × 35). Draw: the side view.
Opening move: before drawing anything, work out the side view's size. Its width is the depth (35, read from the top view) and its height is the height (40, read from the front view). Then build it with projectors: heights straight across from the front view, depths through a 45° mitre line from the top view.
🎧 This question has a narrated walkthrough (about 4 min, sound on): the side view built feature by feature, with three pause-and-commit questions.
1) Guessing the side view from the isometric instead of projecting it. Every line of the side view must line up with a line in the front view (height) and a line in the top view (depth). If a line has no partner in both, it is wrong. 2) Forgetting the hidden lines. The tunnel and slot are invisible from the side but must appear dashed, and they are part of the marks. 3) Flipping the depth. In this layout the front of the object (A = 35) is the edge of the side view nearest the front view. 4) Measuring depth with a scale instead of carrying it with the mitre line. That's slower and loses accuracy.
✏️ Practice: five more missing-view problems at this level — draw first, then step through the answer.
Q8 · The missing lines · 5 marks
Q8. Draw the missing lines in the orthographic projection of the object shown in the figure below.
With it: an isometric drawing of a bracket (a base 100 × 40 × 20 with a channel 80 wide × 10 high underneath, two Ø10 holes, R5 rounds; an upright 20 thick with an R20 top and a Ø20 hole), and its three views with some lines left out.
Given: three views, incomplete. Draw: the lines that are missing. On the sheet's answer there are eight, all hidden lines: three in the front view, three in the top view, two in the side view.
Opening move: list the object's features (two base holes, the channel, the upright hole). For each feature, ask what it must leave in each of the three views, then check which of those lines are already drawn. A hole always shows as a circle in one view and as two parallel lines (usually hidden) in the other two.
🎧 This question has a narrated walkthrough (about 3 min, sound on): the missing lines found one feature at a time, with two pause-and-commit questions.
1) Drawing only one line of a hole. A cylinder hole seen side-on is two lines, one per edge. The paper deliberately drew one of each pair. 2) Missing the feature you can't see in the isometric, such as the channel underneath. Hidden features need to be found from the other views. 3) Drawing missing lines as visible (thick) when they are hidden. The line type is part of the answer. 4) Forgetting centre lines for holes. They're cheap to draw and often part of the marks.
✏️ Practice: four more missing-lines problems at this level — draw first, then step through the answer.
Q10 · The sectional front view · 5 marks
Q10. Draw the sectional front view of the object shown in the figure below
With it: the top view with the section plane marked along the long centre line, and an isometric drawing. The object is a plate 80 × 40 with R20 ends, 5 thick, with two Ø10 holes, and a boss R10, 20 tall, with a Ø10 bore.
Given: top view with the cutting plane; isometric. Draw: the front view as if the front half were cut away, with hatching.
Opening move: imagine removing everything in front of the cutting plane and looking at the cut face. Then three rules. Solid material that the plane cuts is hatched. Empty space (holes, bore) is not. Edges that were hidden are now visible, so a sectional view has no hidden lines.
🎧 This question has a narrated walkthrough (about 3 min, sound on): the cutting plane, what gets hatched, then this sectional view built in pencil order, with two pause-and-commit questions.
1) Hatching the holes or the bore. Only material is hatched. 2) Hatching in two directions or at uneven spacing on one part. One part means one hatch direction, 45°, thin and even. 3) A line between the boss and the plate. They are one piece, so there's no line where they meet. 4) Leaving hidden lines in. A sectional view shows cut edges as visible lines and omits hidden ones. 5) Hatching thick. Hatching is thin; the outline is thick.
✏️ Practice: five more sectional-view problems at this level — draw first, then step through the answer.
Before the exam
☐ Redraw Q7's missing view once on paper with the solution covered. ☐ Redraw Q10's sectional view and hatch it. ☐ For Q8, say aloud "circle in one view, two lines in the others" for each hole. ☐ Pack: two pencils (hard for construction, softer for final lines), compass, dividers, 45° and 30–60 set squares, scale, eraser.