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AP Intermediate 1st Year Physics — practice by topic

Browse 565 questions across 11 Physics topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Physics topics

Laws of Motion (87)Gravitation (58)System of Particles and Rotational Motion (58)Units, Measurements and Motion in a Straight Line (56)Work, Energy and Power (56)Kinetic Theory & Oscillations (50)Motion in a Plane (50)Thermal Properties of Matter & Thermodynamics (50)Waves (50)Mechanical Properties of Solids and Fluids (37)Unit 2B: Friction, Gravitational and Normal Forces (13)

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Which of the following is the correct definition of **stress** in a deformed body?Read the answer and worked solution →A material that returns to its original shape once the deforming force is removed is said to beRead the answer and worked solution →The SI unit of Young's modulus isRead the answer and worked solution →On the stress-strain curve of a ductile material, the **proportional limit** is the point up to whichRead the answer and worked solution →

Worked practice questions

Which of the following is the correct definition of **stress** in a deformed body?

  1. the change in length per unit original length
  2. the internal restoring force per unit area
  3. the external force applied to the body
  4. the volume change per unit applied force
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Correct answer: B. the internal restoring force per unit area

Stress $\sigma = F/A$ is the internal restoring force per unit cross-sectional area that the body develops to resist deformation. Option A defines *strain* (a dimensionless ratio). **Option C is the applied force itself, not stress.**

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A material that returns to its original shape once the deforming force is removed is said to be

  1. plastic
  2. elastic
  3. brittle
  4. ductile
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Correct answer: B. elastic

Elasticity is the property of returning to the original configuration when the deforming force is removed. Plastic materials retain the deformation. Brittle and ductile describe *how* a material fails or yields, not whether it recovers.

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The SI unit of Young's modulus is

  1. $\text{N}$
  2. $\text{N m}^{-2}$
  3. $\text{N m}^{2}$
  4. dimensionless
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Correct answer: B. $\text{N m}^{-2}$

$Y = \text{stress}/\text{strain}$. Strain is dimensionless, so $Y$ has the units of stress: $\text{N m}^{-2}$ (i.e. Pa). The same goes for shear modulus $G$ and bulk modulus $K$.

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