Consider two steel rods, A and B. B has three times the area and twice the length of A, so Young's modulus for B will be what factor times Young's modulus for A?
a. 3.0
b. 0.5
c. 1.5
d. 1.0
[Ques. 2] Bar One has a Young's modulus that is bigger than that of Bar Two. This indicates Bar One
a. is longer than Bar Two.
b. has a greater cross-sectional area than Bar Two.
c. has a greater elastic limit than Bar Two.
d. is made of material that is different from Bar Two.
[Ques. 3] A uniform pressure of 5.7 105 N/m2 is applied to all six sides of a copper cube. What is the percentage change in volume of the cube? (for copper, B = 14 1010 N/m2)
a. 0.00070
b. 0.00040
c. 0.0000020
d. 0.00041
[Ques. 4] The bulk modulus of a material, as a meaningful physical property, is applicable to which of the following?
a. only solids
b. only liquids
c. only gases
d. solids, liquids and gases
[Ques. 5] The quantity strain expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT1.
b. ML1T2.
c. M2L1T3.
d. a dimensionless quantity.
[Ques. 6] The quantity stress expressed in terms of the fundamental quantities (mass, length, time) is equivalent to
a. MLT1.
b. ML1T2.
c. M2L1T3.
d. a dimensionless quantity.
[Ques. 7] In an elastic solid there is a direct proportionality between strain and
a. elastic modulus.
b. temperature.
c. cross-sectional area.
d. stress.
[Ques. 8] A copper wire of length 5.0 m, cross sectional area 6.9 106 m2, and Young's modulus 11 1010 N/m2 has a 190-kg load hung on it. What is its increase in length? (g = 9.8 m/s2)
a. 5.0E3 m
b. 1.8E2 m
c. 7.3E3 m
d. 1.2E2 m
e. 2.5E2 m
[Ques. 9] A small sphere is allowed to fall through air, and when the sphere has a speed of 4.8 104 m/s, the viscous force on the sphere is 3.0 1015 N. If the viscosity of air is 1.4 105 Ns/m2, what is the radius of the drop?
a. 2.4E8 m
b. 8.4E6 m
c. 2.3E7 m
d. 8.5E7 m
[Ques. 10] A substance is allowed to diffuse along a 10-cm length of tubing filled with water. The cross section of the tube is 5.3 cm2 . If the diffusion coefficient is 5.0 1010 m2/s, and 6.5 1014 kg is transported along the tube in 16 s, what is the difference in the concentration levels of the substance at the two ends of the tube?
a. 3.9E1 kg/m3
b. 4.3E2 kg/m3
c. 1.5E3 kg/m3
d. 8.1E4 kg/m3
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