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1. Stress is defined as

A. Force per unit area B. Change in length per unit area C. Force per unit volume D. Change in volume per unit force

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2. The bulk modulus of a material is the ratio of

A. Shear stress to strain B. Volume stress to volumetric strain C. Stress to linear strain D. Linear strain to stress

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3. Young’s modulus is the property of

A. Liquids only B. Gases only C. Solids only D. Solids and liquids

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4. The unit of modulus of elasticity in the SI system is

A. Pascal B. Newton C. Newton per meter D. Joule per meter

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5. The strain energy per unit volume in a stretched wire is

A. Stress × strain B. 1/2 × stress × strain C. Stress² × strain D. 1/2 × stress² / strain

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6. The Poisson’s ratio is defined as the ratio of

A. Longitudinal strain to lateral strain B. Lateral strain to longitudinal strain C. Stress to strain D. Stress to lateral strain

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7. If a wire is stretched to double its original length, its Young’s modulus

A. Doubles B. Halves C. Remains the same D. Becomes zero

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8. A fluid is said to be incompressible if

A. Its density is constant B. Its volume is constant C. Its flow rate is constant D. Its velocity is constant

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9. Viscosity is defined as

A. Frictional force per unit area B. Internal friction opposing relative motion between adjacent layers C. Force per unit volume D. Force per unit length

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10. The velocity of efflux of a liquid through an orifice is given by

A. Bernoulli’s principle B. Archimedes’ principle C. Torricelli’s theorem D. Stokes’ law

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11. The rise of liquid in a capillary tube is due to

A. Surface tension B. Viscosity C. Density of the liquid D. Pressure difference

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12. The terminal velocity of a sphere falling through a viscous fluid depends on

A. The density of the sphere only B. The density of the fluid only C. The radius of the sphere, density of the fluid, and the sphere D. The velocity of the sphere only

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13. The SI unit of surface tension is

A. Joule B. Newton per meter C. Pascal D. Watt

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14. A liquid drop tends to assume a spherical shape because of

A. Gravity B. Viscosity C. Surface tension D. Buoyancy

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15. Bernoulli’s equation is based on the principle of

A. Conservation of energy B. Conservation of mass C. Conservation of momentum D. Conservation of angular momentum

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16. A hydraulic lift works on the principle of

A. Pascal’s law B. Archimedes’ principle C. Bernoulli’s theorem D. Newton’s second law

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17. The pressure inside a soap bubble is

A. Equal to atmospheric pressure B. Less than atmospheric pressure C. Greater than atmospheric pressure D. Zero

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18. The excess pressure inside a soap bubble of radius r is proportional to

A. 1/r B. r² C. r D. 1/r²

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19. The buoyant force on a submerged object depends on

A. Its weight B. Its density C. The density of the fluid and the volume of the displaced fluid D. The temperature of the fluid

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20. A floating body displaces a volume of fluid whose weight is equal to

A. The weight of the fluid B. The weight of the body C. The volume of the fluid D. The density of the body