# CHAPTER-9: MECHANICAL PROPERTIES OF SOLIDS

1. Poisson’s Ratio is applicable to-

• Solid only
• Gas only
• Liquid only
• All of these

2. The restoring force per unit area is known as-

• strain
• elasticity
• stress
• None of these

3. The ratio of stress to strain is called-

• Frictional coefficient
• Elastic constant
• Coefficient of viscosity
• Surface tension

Elastic constant

4. Unit of Stress is

• Nm⁻¹
• Nm
• Nm⁻²
• Nm⁻³

5. The dimensional formula of stress is-

• [ML⁻¹T⁻²]
• [M°L°T°]
• [MLT⁻¹]
• [MLT⁻²]

[ML⁻¹T⁻²]

6. According to Hooke’s Law of Elasticity, if stress is increased, the ratio of stress to strain-

• decreases
• becomes zero
• increases
• remains constant

remains constant

7. Substances which can be stretched to cause large strain are called-

• Isomers
• Elastomers
• Plastomers
• Polymers

8. The ratio of stress and strain is called-

• surface tension
• modulus of elasticity
• coefficient of friction
• coefficient of viscosity

modulus of elasticity

9. The ratio of tensile and longitudinal strain is called–

• young’s modulus
• modulus of elasticity
• bulk modulus
• None of these

young’s modulus

10. The ratio of shearing stress to the shearing strain is defined as-

• Young’s Modulus
• Bulk Modulus
• Shear Modulus
• Compressibility

Shear Modulus

11. The Shear modulus is also known as-

• Bulk Modulus
• Young’s Modulus
• Modulus of Rigidity
• Poisson’s Ratio

Modulus of Rigidity

12. Stress is a …. quantity.

• vector
• dimensionless
• scalar
• tensor

13. The internal restoring force per unit area is called-

• tensile stress
• hydraulic stress
• None of these
• shearing stress

hydraulic stress

14. The reciprocal of the bulk modulus is called-

• compressibility
• bulk modulus
• young’s modulus
• None of these

compressibility

15. The unit of modulus of the coefficient is-

• N/m
• N/m²
• Nm²
• None of these

16. Which of the following is more elastic?

• Glass
• Sponge
• Steel
• Rubber

17. Out of the following, which is the most plastic material?

• Rubber
• Iron
• Wood
• Plasticine

18. Solids which break above the elastic limit are called

• Ductile
• Elastic
• Brittle
• Malleable