Microscopic Examination MCQ’s

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This set of Materials Science Multiple Choice Questions & Answers (MCQs) focuses on “Microscopic Examination”.

1. For grain size number (ASTM) which of the following is true?
a) Size of grains with grain size no 8 will be more than that of grain size no 5
b) Size of grains with grain size no 6 will be more than that of grain size no 7
c) Size of grains with grain size no 6 will be more than that of grain size no 2
d) Size of grains with grain size no 14 will be more than that of grain size no 15

2. Which of the following is not an important application of microstructure examination?
a) To ensure that the associations between the properties and structure (and defects) are properly understood
b) To predict the properties of materials once these relationships have been established
c) To design alloys with new property combinations
d) To ascertain the mode of chemical fracture

3. Calculate the average number of grains per square inch at a magnification of 100. Consider grain number is 40?
a) 5.49*109
b) 5.49*107
c) 5.49*1011
d) 5.49*106

4. Which of the following microscope are not used for microscopy?
a) Optical
b) Ultrasonic
c) Electron
d) Scanning probe

5. Which type of microscopic technique has been developed that generate topographical maps representing the surface features and characteristics of the specimen?
a) Optical
b) Ultrasonic
c) Electron
d) Scanning probe

6. What is the range of grain size number in case of ASTM?
a) 1 to 10
b) 1 to 100
c) 1 to 1000
d) 1 to 10000

7. Which technique is used to determine the grain size of polycrystalline materials?
a) Photo micrographic technique
b) Positron annihilation technique
c) Measuring resistivity after quenching
d) Thermal imaging

8. Which of the following method is commonly used to determine grain size?
a) Precipitation
b) Standard comparison charts
c) Densification
d) Electrical conductivity

9. What is the full form of ASTM?
a) American society for testing and materials
b) African society for testing and materials
c) American society for torque and momentum forces
d) American society for tensile motion forces

10. Which of the following is not the structural characteristic of a polycrystalline specimen?
a) Shape
b) Average size
c) Reactivity
d) Diameter

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