Building Material [2]

61) The coefficient of linear expansion of concrete is almost the same as that of steel.

  • (a) Correct
  • (b) Incorrect

62) According to Indian standard specifications, the full strength of concrete is achieved after

  • (a) 7 days
  • (b) 14 days
  • (c) 21 days
  • (d) 28 days

63) According to Indian standard specifications, the concrete should be cured under a humidity of

  • (a) 30%
  • (b) 50%
  • (c) 70%
  • (d) 90%

64) According to Indian standard specifications, the temperature for curing is

  • (a) 5ºC
  • (b) 10ºC
  • (c) 27ºC
  • (d) 42ºC

65) The slump test of concrete is used to measure its

  • (a) consistency
  • (b) tensile and compressive strength
  • (c) impact value
  • (d) homogeneity

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