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Mechanical properties of matter Q1

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Mechanical properties of matter Q1

  1. 1. QUIZ 1: MECHANICAL PROPERTIES OF MATTER 1. Which of the following quantities is independent of the size and shape of an object composed of a given material? a. Volume b. Mass c. Weight d. Density 2. When equal and opposite forces are exerted on an object along different lines of action, the object is said to be under. a. tension b. compression c. shear d. elasticity 3. Ductility refers to the ability to/ a. be deformed temporarily b. be deformed permanently c. shrink under compression d. break under tension 4. When a force acts on an object, the stress on it is equal to a. the relative change in its dimensions b. the applied force per unit area c. Young’s modulus d. the elastic limit 5. A shear stress that acts on an object affects its a. length b. width c. volume d. shape 6. Another name for the shear modulus of a material is a. Young’s modulus b. modulus of rigidity c. bulk modulus d. ductility 7. The only elastic modulus that applies to liquids is a. Young’s modulus b. shear modulus c. modulus of rigidity d. bulk modulus 8. According to Hooke’s law, the force needed to elongate an elastic object by an amount x is proportional to a. x b. 1/x c. x2 d. 1/x2 9. The stress on a wire supporting a load does not depend on a. the wire’s length b. the wire’s diameter c. the mass of the load. d. the acceleration of gravity 10. The density of brass is 8.4 g/cm3 . The volume of a 200-g brass monkey is approximately a. 0.042 cm3 b. 0.41 cm3 c. 24 cm3 d. 1.7 L 11. Gasoline has a specific gravity of 0.68. One liter of gasoline weighs a. 0.68 N b. 1.4 N c. 6.7 N d. 6.8 N 12. A quart of water weighs 2.1 lb. and a quart of antifreeze weighs 2.3 lb. The specific gravity of the antifreeze is a. 0.2 b. 0.9 c. 1.1 d. 2.3 13. A cable stretches by the amount a under a certain load. If it is replaced by a cable of the same material but half as long and half the diameter, the same load will stretch it by a. a/4 b. a /2 c. a d. 2a 14. The original cable in Multiple Choice 13 could support a maximum load of w without exceeding the elastic limit. The elastic limit will not be exceeded by the new cable up to a load of a. w/4 b. w/2 c. w d. 2w 15. An iron wire 1.0m long with a square cross section 2.0 mm on a side is used to support a 100-kg load. its elongation is a. 0.0027 mm b. 0.27 mm c. 1.3 mm d 3.7 mm 16. A brass rod 5.0 ft. long with a square cross section 0.50 in. on a side is used to support a 520-lb load. Its elongation is a. 0.0008 in b. 0.0048 c. 0.0096 in d. 0.048 in 17. Young’s modulus for aluminum is 7.00 x 1010 Pa. The force needed to stretch by 1.0 mm an aluminum wire 2.0 mm in diameter and 800 mm long is a. 2.75 N b. 275 N c. 1.10 kN d. 2.75 kN 18. The elastic limit of aluminum is 1.80 x 108 Pa. The maximum mass the wire in Multiple Choice 17 can support without exceeding the elastic limit is a. 58 kg b. 116 kg c. 232 kg d. 565 kg 19. A wire 10 m long with a cross-sectional area of 0.10 cm2 stretches by 13 mm when a load of 100 kg is suspended from it. The Young’s modulus for this wire is a. 0.77 X 1010 Pa b. 7.5 X1010 Pa c. 7.7 X 1010 Pa d. 9.3 X 1010 Pa 20. The ultimate strength in compression of aluminum is 2 X 108 Pa. The maximum mass an aluminum cube 1 cm on each edge can support is about. a. 2 X 102 kg b. 2 X 103 kg c. 2 X 104 kg d. 2 X 105 kg 21. The force need to punch a hole 8.0 mm square in a sheet 3.0 mm thick whose shear strength is 2.5 X 108 Pa is a. 2.7 kN b. 6 kN c. 24 kN d. 48 kN 22. When a pressure of 2.0 MPa is applied to a sample of kerosene, it contracts by 0.15%. The bulk modulus of kerosene is: a. 1.7 MPa b. 1.997 MPa c. 2.003 MPa d. 1.3 GPa REFERENCE: Modern Technical Physics 6th Edition by Arthur Beiser

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