TRB BT Assistant - Elasticity, Viscosity and Surface Tension Online Test (MCQ Quiz)

1. What is the ability of a body to regain its original shape and size after the removal of the deforming force called?

A) Plasticity B) Elasticity C) Viscosity D) Surface Tension

2. Which property of a material allows it to deform permanently under stress?

A) Elasticity B) Brittleness C) Plasticity D) Ductility

3. What is the unit of stress in the SI system?

A) Pascal (Pa) B) Newton (N) C) Joule (J) D) Watt (W)

4. Stress is defined as:

A) Force per unit area B) Change in length per unit original length C) Energy per unit volume D) Force per unit volume

5. Strain is defined as:

A) Force per unit area B) Energy stored per unit volume C) Change in dimension per unit original dimension D) Pressure applied to a surface

6. Which of the following is a dimensionless quantity?

A) Stress B) Strain C) Force D) Pressure

7. Hooke's Law states that within the elastic limit:

A) Stress is directly proportional to strain B) Strain is directly proportional to stress C) Stress is inversely proportional to strain D) Strain is inversely proportional to stress

8. The constant of proportionality between stress and strain within the elastic limit is called:

A) Poisson's Ratio B) Modulus of Elasticity C) Bulk Modulus D) Shear Modulus

9. Which modulus of elasticity is defined as the ratio of tensile stress to tensile strain?

A) Bulk Modulus B) Shear Modulus C) Young's Modulus D) Modulus of Rigidity

10. The ratio of shear stress to shear strain is called:

A) Young's Modulus B) Bulk Modulus C) Modulus of Rigidity D) Poisson's Ratio

11. Which modulus of elasticity is relevant for changes in volume due to pressure?

A) Young's Modulus B) Shear Modulus C) Bulk Modulus D) Modulus of Elasticity

12. The ratio of lateral strain to longitudinal strain, when a stress is applied along one direction, is known as:

A) Young's Modulus B) Poisson's Ratio C) Bulk Modulus D) Shear Modulus

13. What is the SI unit of Modulus of Elasticity?

A) Pascal (Pa) B) Newton per meter (N/m) C) Joule per meter (J/m) D) Newton (N)

14. Materials with a high Young's Modulus are considered:

A) Flexible B) Stiff C) Brittle D) Ductile

15. A perfectly elastic body would:

A) Deform permanently B) Regain its original shape instantly and completely C) Undergo plastic deformation D) Break under minimal stress

16. What is the term for the maximum stress a material can withstand before it starts to deform permanently?

A) Tensile Strength B) Yield Strength C) Ultimate Tensile Strength D) Elastic Limit

17. Which property describes a material's ability to absorb energy when deformed elastically and release it upon unloading?

A) Toughness B) Hardness C) Resilience D) Ductility

18. What is viscosity?

A) The tendency of a liquid to resist flow B) The ability of a solid to resist deformation C) The force exerted by a liquid surface D) The expansion of a liquid due to heat

19. Viscosity is a measure of a fluid's internal:

A) Pressure B) Density C) Resistance to flow D) Surface tension

20. Which type of fluid has zero viscosity?

A) Ideal fluid B) Real fluid C) Newtonian fluid D) Non-Newtonian fluid

21. For a Newtonian fluid, the shear stress is directly proportional to the:

A) Pressure B) Temperature C) Rate of shear strain D) Density

22. Which factor generally increases the viscosity of liquids?

A) Increase in temperature B) Decrease in temperature C) Decrease in pressure D) Addition of a solvent

23. How does temperature affect the viscosity of gases?

A) Viscosity decreases with increasing temperature B) Viscosity increases with increasing temperature C) Viscosity remains constant with temperature D) Viscosity is independent of temperature

24. What is the SI unit of dynamic viscosity?

A) Poise (P) B) Pascal-second (Pa·s) C) Stokes (St) D) Newton (N)

25. What is kinematic viscosity?

A) Ratio of viscosity to density B) Ratio of density to viscosity C) Viscosity divided by pressure D) Viscosity multiplied by area

26. Which is more viscous: honey or water?

A) Water B) Honey C) They have the same viscosity D) Depends on temperature

27. The force of attraction between the molecules of the same substance is called:

A) Adhesion B) Cohesion C) Surface tension D) Capillarity

28. Surface tension is defined as:

A) Force per unit length acting perpendicular to a line drawn on the surface B) Energy required to increase the surface area by a unit amount C) The tendency of a liquid to minimize its surface area D) All of the above

29. What is the SI unit of surface tension?

A) Newton per meter (N/m) B) Joule per meter (J/m) C) Pascal (Pa) D) Newton (N)

30. Surface tension causes liquids to behave like a:

A) Viscous fluid B) Stretched elastic membrane C) Compressible gas D) Solid crystal

31. How does temperature affect the surface tension of liquids?

A) Surface tension increases with increasing temperature B) Surface tension decreases with increasing temperature C) Surface tension is unaffected by temperature D) Surface tension is zero at all temperatures

32. The phenomenon where a liquid rises or falls in a narrow tube due to surface tension and adhesion is called:

A) Viscosity B) Diffusion C) Capillarity D) Osmosis

33. In a narrow glass tube, water rises due to:

A) Cohesion forces being stronger than adhesion forces B) Adhesion forces being stronger than cohesion forces C) Surface tension only D) High viscosity

34. Mercury in a glass tube typically shows a depressed meniscus because:

A) Adhesion forces are stronger than cohesion forces B) Cohesion forces are stronger than adhesion forces C) Surface tension is very low D) The tube is hydrophobic

35. Which of the following is NOT a unit of viscosity?

A) Pascal-second B) Poise C) Stokes D) Dyne-cm

36. The ability of a material to deform under tensile stress without fracturing is called:

A) Brittleness B) Hardness C) Ductility D) Elasticity

37. What is the relationship between bulk modulus (K), Young's modulus (Y), and Poisson's ratio (σ)?

A) K = Y / (3(1-2σ)) B) K = Y / (1-2σ) C) K = 3Y / (1-2σ) D) K = Y * (3(1-2σ))

38. A fluid's resistance to a shearing force is directly related to its:

A) Surface tension B) Density C) Viscosity D) Compressibility

39. The strain energy stored per unit volume in a deformed elastic body is:

A) Stress B) Strain C) Modulus of Elasticity D) Proof Resilience

40. Which phenomenon explains why a needle can float on water if placed gently?

A) Buoyancy B) Surface tension C) Viscosity D) Capillarity

41. The maximum stress a material can withstand before breaking is known as its:

A) Yield strength B) Elastic limit C) Ultimate tensile strength D) Fatigue strength

42. For a given stress, a material with a lower Young's modulus will experience a:

A) Smaller strain B) Larger strain C) No strain D) Constant strain

43. What is the unit of kinematic viscosity?

A) m²/s B) Pa·s C) N/m D) m/s

44. Which of the following is a consequence of surface tension?

A) A ball rolling down a slope B) Raindrops being spherical C) A balloon inflating D) A magnet attracting iron filings

45. The resistance of a fluid to deformation at a rapid rate is characteristic of:

A) Elasticity B) Surface tension C) Viscosity D) Plasticity

46. If the length of a wire is doubled, its resistance to stretching (within elastic limit) will:

A) Double B) Halve C) Remain the same D) Become four times

47. The phenomenon of flow of a fluid in layers, without mixing, is called:

A) Turbulent flow B) Laminar flow C) Viscous flow D) Ideal flow

48. What is the value of Poisson's ratio for an incompressible material?

A) 0 B) 0.5 C) 1 D) Infinity

49. Which property of liquids is responsible for the formation of spherical bubbles and droplets?

A) Viscosity B) Density C) Surface Tension D) Adhesion

Elasticity, Viscosity and Surface Tension - Online Test

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