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

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]

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

- decreases
- becomes zero
- increases
- 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

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

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

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

- Young’s Modulus
- Bulk Modulus
- Shear Modulus
- Compressibility

11. The Shear modulus is also known as-

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

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

14. The reciprocal of the bulk modulus is called-

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

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