Microhardness Test MCQ

Test your knowledge with important Microhardness Test MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Microhardness Test MCQs at Bissoy

• Which of the following hardness is least affected by surface scratched and local inhomogeneity of the material?
  ক

  Brinell hardness

  খ

  Mayer hardness

  গ

  Rockwell hardness

  ঘ

  Vickers hardness
• Suppose Brinell hardness measurement is made from a nonstandard ball of diameter 5 mm. If the load applied in 10 mm standard ball is 3000 kg, then what load should be applied on the 5 mm ball to get the consistent reading in hardness measurement?
  ক

  500 kg

  খ

  250 kg

  গ

  750 kg

  ঘ

  1500 kg
• How is Brinell hardness measured?
  ক

  Using a dial gauge showing hardness reading

  খ

  The graph obtained from machine showing hardness

  গ

  Using an indentation profile which will be checked in a microscope for indentation diameter

  ঘ

  By checking the deformation of the ball
• For hard materials, the indenter of the Brinell hardness tester is made of __________
  ক

  steel

  খ

  diamond

  গ

  tungsten carbide

  ঘ

  copper
• The diameter of the steel ball used in Brinell hardness is ________
  ক

  10 mm

  খ

  10 cm

  গ

  1 mm

  ঘ

  3.6 mm
• The Brinell Hardness measurement is a concept based on __________
  ক

  indentation

  খ

  shearing

  গ

  rebound

  ঘ

  scratch
• The Shore hardness test measurement uses the concept of _____________
  ক

  indentation

  খ

  deformation

  গ

  rebound

  ঘ

  scratch
• Hardness of most metals fall in the range of __________ in Mohr’s scale.
  ক

  1-3

  খ

  3-6

  গ

  4-8

  ঘ

  7-10
• The hardness value of martensite according to Mohr’s scale is ___________
  ক

  1

  খ

  10

  গ

  3

  ঘ

  7
• The scratch hardness range is ______________
  ক

  1-10

  খ

  1-100

  গ

  10-1000

  ঘ

  100-110
• Which of the following is not a measurement method for hardness?
  ক

  Scratch hardness

  খ

  Indentation hardness

  গ

  Rebound hardness

  ঘ

  Elongation hardness
• The stress concentration and notch sensitivity are the same phenomena in the material.
  ক

  True

  খ

  False
• What is the formula for Knoop hardness number?
  ক

  KHN = h – 500t

  খ

  KHN = 1.854P/L2

  গ

  KHN = P/ D2

  ঘ

  KHN = P/L2C
• Microhardness test gives average hardness.
  ক

  True

  খ

  False
• In microhardness test, Vickers test uses load less than 1 kgf.
  ক

  True

  খ

  False
• What is Knoop hardness of gold foil?
  ক

  68 HK

  খ

  69 HK

  গ

  343 HK

  ঘ

  820 HK
• What is Knoop hardness of diamond?
  ক

  100 HK

  খ

  1000 HK

  গ

  7000 HK

  ঘ

  9000 HK
• What is the disadvantage of the Knoop hardness test?
  ক

  Elastic recovery

  খ

  Soft indenter

  গ

  High load required

  ঘ

  Cannot use thin specimen
• Which of the following is an angle between opposite faces in Knoop indenter?
  ক

  130°

  খ

  120°

  গ

  136°

  ঘ

  122°
• Which test is more preferred for testing hardness of electroplated surface?
  ক

  Dynamic hardness test

  খ

  Scratch hardness test

  গ

  Macrohardness test

  ঘ

  Microhardness test
• What is the diagonals’ ratio of Knoop indenter?
  ক

  1:1

  খ

  1:2

  গ

  7:1

  ঘ

  10:1
• What is the shape of indentation by knoop indenter?
  ক

  Semi spherical

  খ

  Square

  গ

  Cone

  ঘ

  Rhombohedral
• Which of the following is a Microhardness test?
  ক

  Brinell

  খ

  Knoop

  গ

  Rockwell

  ঘ

  Shore
• What is test load used in Micro hardness test?
  ক

  2-200 gmf

  খ

  5-1000 gmf

  গ

  60 gmf

  ঘ

  100 gmf