1.Which of the following hardness test uses steel ball as indenter?
a) Brinell hardness test
b) Rockwell C hardness test
c) Vickers hardness test
d) Rockwell B hardness test
Explanation: Steel ball is used as indentor in Brinell hardness test.
2. In which of the following test specimen is in the form of the simply supported beam?
a) Izod test
b) Rockwell hardness test
c) Charpy test
d) Brinell test
Explanation: In the Charpy test a supported beam specimen is used.
3. In which of the following test specimen is in the form of cantilever beam?
a) Izod test
b) Rockwell hardness test
c) Charpy test
d) Brinell test
Explanation: Izod test is like Charpy test, but the Izod geometry consists of a cantilever beam with the notch located on the same side as the impact point.
4. The total number of scales used in Rockwell hardness test is?
a) 12
b) 14
c) 15
d) 16
Explanation: There are 15 scales used in Rockwell hardness test, which are being differentiated based on indenter used and the material sampled.
5. Hounsfield tensometer can be used to perform __________
a) Tensile test
b) Compressive test
c) Hardness test
d) Toughness test
Explanation: Hounsfield tensometer, Universal testing machine, Instron and MTS (materials testing system) are the common machine that are used to for tensile test. Hounsfield tensometer is a small machine and widely used for tensile test in research laboratories.
6. ASTM stands for __________
a) American Society for Tensile Measurement
b) American Society for Testing and Materials
c) American Society for Tool Measurement
d) American Society for Tensile Material
Explanation: ASTM stands for American Society for Testing and Materials. ASTM develops technical standards for a wide range of materials products. American Society for Tensile Measurement are used to decide various standard in tensile measurement.
7. According to ASTM standard, which of the following relation is correct about gauge length of cross section area ‘A’?
a) L = 2.51\(\sqrt{A}\)
b) L = 4.51\(\sqrt{A}\)
c) L = 2\(\sqrt{A}\)
d) L = 3.51\(\sqrt{A}\)
Explanation: According to ASTM standard, gauge length = 4.51\(\sqrt{A}\)
8. According to BS standard, which of the following relation is correct about gauge length of cross section area ‘A’?
a) L = 2.51\(\sqrt{A}\)
b) L = 4.51\(\sqrt{A}\)
c) L = 4\(\sqrt{A}\)
d) L = 3.51\(\sqrt{A}\)
Explanation: According to BS standard, gauge length = 4\(\sqrt{A}\), where A denotes the cross section area of specimen used under testing.
9. According to DIN standard, which of the following relation is correct about gauge length of cross section area ‘A’?
a) L = 12.51\(\sqrt{A}\)
b) L = 14.51\(\sqrt{A}\)
c) L = 4\(\sqrt{A}\)
d) L = 11.2\(\sqrt{A}\)
Explanation: According to DIN standard, gauge length=11.2\(\sqrt{A}\), where A denotes the cross section area of specimen used under testing.
10. Mohs hardness test has a scale range of _________
a) 1 to 10
b) 100 to 200
c) 1 to 1000
d) 1 to 3000
Explanation: Mohs hardness scale was developed by “Frederich Mohs” in 1822, which is a chart that denotes relative hardness of the various materials (1-softest to 10-hardenst). According to Mohs scale, diamond is the hardest material and talc is the softest material.