Class 11 Physics · Chapter 5 · Test 2
Stress-Strain Curve
35 MCQs This test covers Hooke’s law, proportional and elastic limits, yield point, UTS, fracture, and ductile and brittle materials. It also covers strain energy (½Fx and ½kx²) with spring numericals.
35 questions · 30 min · 35 marks
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Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
Hooke's law states that within the elastic limit, strain is:
- AInversely proportional to stress
- BDirectly proportional to stress
- CIndependent of stress
- DProportional to the square of stress
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Answer: B
Strain (deformation) is directly proportional to stress (load) within the proportional limit.
Question 2
Hooke's law is obeyed in which region of the stress-strain curve?
- AFrom B to C
- BFrom O to A
- CBeyond C
- DFrom C to D
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Answer: B
Stress is linearly proportional to strain from O to A.
Question 3
The proportional limit is the maximum stress up to which:
- AThe material fractures
- BThe material flows
- CStress is proportional to strain
- DStrain stays constant
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Answer: C
The proportional limit is the greatest stress a material withstands without losing proportionality between stress and strain.
Question 4
Between points A and B on the curve, stress and strain are:
- ADirectly proportional
- BNot proportional, though the material is still elastic
- CInversely proportional
- DBoth zero
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Answer: B
From A to B proportionality is lost but the material still recovers when unloaded.
Question 5
If the load is removed at any point between O and B, the material:
- AIs permanently deformed
- BReturns to its original state
- CFractures
- DMelts
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Answer: B
The region OB is the elastic region where the material regains its original state.
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