E-PolyLearning

41. Energy change is called as enthalpy change, when it occurs at
a. varied pressure
b. constant volume
c. varied volume
d. constant pressure
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Answer: (d).constant pressure

42. Electrical and thermal properties for some crystalline solids depend upon
a. surface
b. area
c. direction
d. density
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Answer: (c).direction

43. Blockages in veins can be detected by use of
a. skin thermography
b. liver thermography
c. environment thermography
d. all of these
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Answer: (a).skin thermography

44. London forces strength is affected by
a. shape of molecules
b. strength of electronic cloud
c. density of molecules
d. volume of molecules
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Answer: (b).strength of electronic cloud

45. Usual habit of crystals of ice is
a. cubic
b. monoclinic
c. hexagonal
d. rhombic
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Answer: (c).hexagonal