Engineering Worksheet: Final Test

Engineering lesson 24: Final engineering test · Set 141 · 40 questions

Engineer's tip (Find the topic, use the idea): Find the topic: design process, force, machine, lever, structure, material, bridge or scale. Use that lesson’s rule — what is in the middle, load × distance = effort × distance, work = force × distance, real = drawing × scale. Write the calculation before you answer.

1. 1.🪝 A bucket weighing 220 N is lifted with a single fixed pulley at the top of a well. What effort is needed, in newtons? (ideal pulley, no friction)
2. 2.🛞 How can we reduce friction in a machine? (a) press parts harder (b) add sand (c) make parts rough (d) oil the moving parts
3. 3.⚖️ A lever bar balances. The load is ? N at 10 cm from the fulcrum. The effort is 50 N at 100 cm from the fulcrum on the other side. What is the missing force in newtons?
4. 4.⚖️ A seesaw balances. Meena (130 N) sits 3 m from the pivot on one side; Asha (? N) sits 1 m from the pivot on the other side. What is the missing weight in newtons?
5. 5.🧪 A paper bridge was tested three times. It held 360 g, 270 g and 420 g. What is the mean (average) load it held, in grams?
6. 6.True or false: to grip and bend wire, use sandpaper. (a) False (b) True
7. 7.True or false: opening a drawer is a push. (a) True (b) False
8. 8.🌉 Which bridge type: “the longest spans of all”? (a) arch bridge (b) beam bridge (c) suspension bridge
9. 9.🔍 Which is the odd one out? (a) roll at least 2 metres (b) fit on a school desk (c) use only paper and tape (d) spend at most ₹100
10. 10.⚖️ A seesaw balances. Meena (400 N) sits 4 m from the pivot on one side; Ravi (800 N) sits ? m from the pivot on the other side. What is the missing distance in metres?
11. 11.🔺 A flat frame has 8 straight sides joined by loose pins at the corners. What is the least number of corner-to-corner braces needed to make it rigid?
12. 12.🔺 A flat frame has 9 straight sides joined by loose pins at the corners. What is the least number of corner-to-corner braces needed to make it rigid?
13. 13.♻️ Reduce, reuse or recycle: use a jar as a pen stand? (a) reduce (b) recycle (c) reuse
14. 14.Which of these uses an arch? (a) a round palace roof (b) a curved stone doorway (c) a planetarium roof (d) a lintel over a door
15. 15.🔢 To follow the engineering design process, which is the LAST step? (a) Test (b) Improve (c) Ask (d) Imagine
16. 16.⚖️ A seesaw balances. Arjun (480 N) sits ? m from the pivot on one side; Ravi (120 N) sits 4 m from the pivot on the other side. What is the missing distance in metres?
17. 17.🧑‍🔧 Which branch of engineering designs machines with moving parts? (a) chemical (b) biomedical (c) civil (d) mechanical
18. 18.🤝 In a design team, who checks the goals are met? (a) builder (b) team leader (c) recorder (d) tester
19. 19.📐 A model car is drawn so that 1 cm stands for 30 cm. The car is 14 cm long in the drawing. How long is the real car, in centimetres?
20. 20.True or false: coal is a renewable energy source. (a) False (b) True
21. 21.⚖️ Which class of lever is a nutcracker? (a) class 1 (b) class 2 (c) class 3
22. 22.True or false: a mechanical engineer plans a space mission. (a) False (b) True
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 5 N, sandpaper 9 N, a glass sheet 2 N. Which surface gave the least friction? (a) a carpet (b) sandpaper (c) a glass sheet (d) a wooden plank
24. 24.🛠️ People need to carry many people far. Which invention helps? (a) a train (b) a bridge (c) a fridge (d) a lift
25. 25.♻️ Is biogas from waste a renewable or a non-renewable energy source? (a) non-renewable (b) renewable
26. 26.True or false: a biomedical engineer builds hospital scanners. (a) True (b) False
27. 27.💪 Is plucking a mango a push or a pull? (a) a push (b) a pull
28. 28.🤝 In a design team, who cuts and joins parts? (a) tester (b) recorder (c) team leader (d) builder
29. 29.⚖️ A seesaw balances. Zoya (? N) sits 3 m from the pivot on one side; Kabir (390 N) sits 4 m from the pivot on the other side. What is the missing weight in newtons?
30. 30.🌉 A beam bridge is 120 m long. Piers split it into equal spans of 10 m. How many spans are there?
31. 31.🔍 Which is the odd one out? (a) building tall and narrow (b) adding cross bracing (c) making brittle joints (d) leaving out steel bars
32. 32.🏋️ A force of 360 N pushes a cart 7 m along the floor. How much work is done, in joules?
33. 33.⚖️ A lever bar balances. The load is 150 N at ? cm from the fulcrum. The effort is 60 N at 50 cm from the fulcrum on the other side. What is the missing distance in centimetres?
34. 34.True or false: a movable pulley halves the effort. (a) False (b) True
35. 35.♻️ Is ocean wave energy a renewable or a non-renewable energy source? (a) renewable (b) non-renewable
36. 36.🧑‍🔧 Which kind of engineer plans a power grid? (a) biomedical (b) mechanical (c) civil (d) electrical
37. 37.⚙️ A wedge is … (a) a wheel on a rod (b) a bar on a pivot (c) two ramps back to back (d) a rope on a wheel
38. 38.🤝 Why do engineers work in teams? (a) to finish nothing (b) many skills and ideas (c) to argue more (d) to work alone
39. 39.True or false: a crowbar is a class 1 lever (fulcrum in the middle). (a) True (b) False
40. 40.🤝 In a design team, who keeps the team on track? (a) team leader (b) recorder (c) tester (d) builder

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