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Free Deformation and Elasticity MCQs with Answers

17 Deformation and Elasticity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Deformation and elasticity describe how solids change shape or volume under an applied force and return to their original form when the force is removed. Work includes stress, strain, Hooke’s law, elastic limit, Young’s modulus and elastic potential energy, while elastic deformation must be distinguished from permanent plastic deformation.

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17 questions

1. A body which breaks down just after crossing the elastic limit is known as:

  • A. Elastic
  • B. Hard
  • C. Ductile
  • D. Brittle

Explanation: A body that breaks down immediately after crossing the elastic limit is known as brittle.

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Correct answer: Brittle

2. The given diagram shows a helical spring attached to a fixed surface. The value of spring constant is taken as 'k' 300 N/m and a 100 N weight is attached at the bottom.The extension in the spring will be

  • A. 0.333 m
  • B. 0.666 m
  • C. 3 m
  • D. 6 m

Explanation: The correct answer is 0.333 m. When a weight is attached to the spring, it exerts a force on the spring, causing it to extend.

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Correct answer: 0.333 m

3. The ratio between applied stress to the volumetric strain is called

  • A. Bulk modulus.
  • B. Shear modulus.
  • C. Young's modulus.
  • D. Modulus of plasticity.

Explanation: The correct concept for the ratio between applied stress and volumetric strain is the bulk modulus.

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Correct answer: Bulk modulus.

4. A piece of copper is drawn into continuous wire. What behavior is the copper exhibiting?

  • A. Brittle only
  • B. Elastic only
  • C. Plastic Only
  • D. Both brittle and elastic

Explanation: For stresses beyond the elastic limit, a material exhibits plastic behaviour.

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Correct answer: Plastic Only

5. The force applied on unit area to produce any change in the volume or length of a body is called:

  • A. Strain
  • B. Stress
  • C. Elasticity
  • D. Equilibrium

Explanation: When the force applied produces a change in length or volume of the object then is it called stress, otherwise the term strain is used.

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Correct answer: Stress

6. Which of the following is the most ductile?

  • A. Glass
  • B. Copper
  • C. Cast iron
  • D. High carbon steel

Explanation: Ductility is the property of being drawn into wires, it is a permanent strain tension test.Copper can be drawn into very thin wires as it…

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Correct answer: Copper

7. The wire made of copper belongs to which specific kind of material?

  • A. Ductile material
  • B. Tough material
  • C. Brittle material
  • D. Deformed material

Explanation: Ductility is the ability of a material to be drawn or plastically deformed without fracture.

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Correct answer: Ductile material

8. A wire of length 2m is attached with mass of 5kg vertically, tensile strain of wire is 0.3 x 10^-3, the extension in wire is:

  • A. 1.5mm
  • B. 2mm
  • C. 0.15mm
  • D. 0.6mm

Explanation: Strain is nothing but ratio of change in length to original length i.e Δl/L.

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Correct answer: 0.6mm

9. The area under the extension-load graph Of an elastic material whose elastic limit has not been exceeded gives its:

  • A. Stress
  • B. Strain energy
  • C. Strain
  • D. Young modulus

Explanation: Strain energy is the energy stored by an object undergoing deformation.

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Correct answer: Strain energy

10. The applied force that the solid can withstand without breaking is called:

  • A. Stiffness of solids
  • B. Strength of solid
  • C. Ductility of solids
  • D. Toughness of solid

Explanation: Strength measures how much stress can be applied to an element before it deforms permanently or fractures.

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Correct answer: Strength of solid

11. The applied force which the solid can withstand without breaking is called

  • A. Stiffness of solids
  • B. Strength of solid
  • C. Ductility of solids
  • D. Toughness of solid

Explanation: Strength measures how much stress can be applied to an element before it deforms permanently or fractures.

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Correct answer: Strength of solid

12. The substances which undergo deformation with a small force are called;

  • A. Elastic substances
  • B. Inelastic substances
  • C. Diamagnetic substances
  • D. Ductile substances

Explanation: Elastic substances are materials that undergo deformation when subjected to small forces, but they can return to their original shape and…

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Correct answer: Elastic substances

13. The ratio of volumetric strain to volumetric stress called:

  • A. compressibility
  • B. young's modulus
  • C. bulk's modulus
  • D. shear's modulus

Explanation: Compressibility is the ratio of volumetric strain to volumetric stress. It is the inverse of bulk's modulus. Its SI unit is the pascal.

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Correct answer: compressibility

14. The substance that undergoes plastic deformation until it breaks is:

  • A. ductile substance
  • B. brittle substance
  • C. plastic substance
  • D. all of these

Explanation: The substance which undergoes plastic deformation until it breaks is a DUCTILE SUBSTANCE. Therefore, option 'A' is correct.

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Correct answer: ductile substance

15. The spring constant of a spring is k. If the spring is cut into two halves then the spring constant of one of the halves is:

  • A. k + 2
  • B. k/2
  • C. 2k
  • D. k

Explanation: According to Hooke's Law, the force exerted by a spring is given by F = -kx, where k is the spring constant and x is the displacement.

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Correct answer: 2k

16. A spring obeying Book's law has an unstretched length of 50 mm and a spring contant of 400 Nm-01. What is the tension in the spring when its overall length is 70mm?

  • A. 8.0N
  • B. 28N
  • C. 160N
  • D. 400N

Explanation: According to Hooke's Law, the force F exerted by a spring is directly proportional to the displacement x from its equilibrium position…

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Correct answer: 8.0N

17. A spring obeying Hook's law has an unstretched length of 50mm and a spring constant of 400 Nm -1. What is the tension in the spring when its overall length is 70mm?

  • A. 8.0N
  • B. 28N
  • C. 160N
  • D. 400N

Explanation: In order to find the displacement x we subtract the untstrected length from the overall length.

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Correct answer: 8.0N
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