How the Assembling Objects test works
Each question shows a box of loose parts followed by four assembled figures. You have 15 minutes for 20 questions, 45 seconds each. MASS is used for jobs such as plant mechanic, electrician, welder and instrumentation specialist.
There are two kinds of question. In the first, the parts carry letters, and the right answer joins each lettered point to the point with the same letter. In the second the parts have no letters, and you fit them together like puzzle pieces to find the one option that shows the whole shape.
How to solve an Assembling Objects question
Rule options out rather than looking for the right one straight away:
- Lettered parts: find where each letter sits on each part, such as a corner, the middle of an edge or the centre.
- Check each option for the first letter only and cross out any that attach it in the wrong place. Then check the next letter.
- Puzzle parts: count the pieces and note one distinctive edge or angle on each.
- Look for a mirrored piece. It has the right shape but cannot fit, and it is a common wrong option.
- Remember that parts may be turned in the answer. Turning is allowed; flipping over is not.
Worked example
The parts box shows a square with point A at its top right corner, a circle with point B on its edge, and a straight bar with one end marked A and the other marked B.
Option 1 joins the bar to the square’s top left corner, so it fails at A. Option 2 joins the bar to the centre of the circle rather than its edge, so it fails at B. Option 3 shows the square flipped, which moves point A to the wrong side. Option 4 runs the bar from the square’s top right corner to a point on the circle’s edge, so it is correct.
Tips for the real Assembling Objects test
- Check one connection point at a time. Most wrong options break only one.
- Do the lettered questions quickly. They are usually faster than the puzzle type.
- If you cannot decide between two options after 45 seconds, choose one and move on.
- Answer every question. MASS does not deduct marks for wrong answers.
Practise Assembling Objects on CogniPrep
Each paper is 20 newly generated questions in 15 minutes, about half lettered and half puzzle type, with four options each. You can skip and come back, tap a chosen option again to clear it, and review all 20 on one grid before handing in. Your result is a score out of 100 for questions answered correctly across the whole paper.