| Date | May 2021 | Marks available | 1 | Reference code | 21M.1.SL.tz0.18 |
| Level | Standard Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | Question number | 18 | Adapted from | N/A |
Question
What is an example of a first-class lever?
A. Triceps contracting, moving the elbow
B. Biceps contracting, moving the elbow
C. Quadriceps contracting, moving the knee
D. Hamstrings contracting, moving the knee
Markscheme
A
Examiners report
Common higher level question. 2nd most challenging question on the paper (27.27 % correctly answered). Option B was the main distractor with more candidates selecting this answer. G2 comments suggested that all the answers are third-class levers; however based on the insertion of the triceps A is the correct answer.
Syllabus sections
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19M.2.SL.tz0.3e:
The diagram shows the lower leg.
Identify the elements A, B and C of the lever system.
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22M.1.SL.tz0.19:
Levers are working throughout the body when a basketball player performs a jump shot. Where is the effort applied in the lower right leg?
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22M.1.HL:.tz0.15:
The diagram shows a volleyball player serving right-handed. Which is an example of a first-class lever during the acceleration phase of the serve?
[Source: 4x6/DigitalVision Vectors via Getty Images.]
A. Extension of the right elbow
B. Flexion of the left elbow
C. Plantar flexion of the right ankle
D. Extension of the left knee
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19N.1.SL.tz0.20:
The diagram shows elbow extension. Which type of lever is used?
[Source: © International Baccalaureate Organization 2019]
A. First
B. Second
C. Third
D. No lever is used during elbow extension
- 21N.1.HL:.tz0.14: When the forearm acts as a first-class lever to extend the elbow, which muscle acts as the...
