SC-213
Choosing materials
Lower Sec Science · Secondary 1 · Hard · Choosing materials
In a hardness test, four materials A, B, C and D are scratched against each other. The results are:
- A is scratched by B, C and D.
- B is scratched by C and D, but not by A.
- C is scratched only by D.
- D is not scratched by any other material.
Which material is the hardest?
- A is scratched by B, C and D.
- B is scratched by C and D, but not by A.
- C is scratched only by D.
- D is not scratched by any other material.
Which material is the hardest?
- A
- B
- C
- D
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