451. High __________ of cast iron makes it suitable for use in machine beds.
A. Compressive strength
B. Endurance strength
C. Damping capacity
D. Tensile strength
✅ The correct answer is option A.
Engineering
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452. The instrument based on the following principle is used for the measurement of oxygen only in the flue gases.
A. Chemical absorption
B. Thermal conductivity
C. Infrared absorption
D. Paramagnetism
✅ The correct answer is option D.
454. Which of the following metals occurs in nature in their free metallic state?
A. Au & Ag
B. Pb & Zn
C. Cu & Ni
D. None of these
✅ The correct answer is option D.
455. It is possible to form martensite
A. Sometimes by cold working
B. Sometimes without nucleation
C. Sometimes by gas quenching
D. Only in iron based alloys
✅ The correct answer is option D.
456. Which of the following has the highest value of refractive index?
A. Brine (sea water)
B. Diamond
C. Distilled water
D. Glass
✅ The correct answer is option B.
457. Nusselt number/Biot number varies
A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid
✅ The correct answer is option A.
458. The following thermocouple may be used for measuring temperature upto 1873°K.
A. Chromel-alumel
B. Copper-constantan
C. Platinum-platinum rhodium
D. Iron-constatan
✅ The correct answer is option C.
459. __________ of test specimens is not involved in any hardness testing method.
A. Fracture
B. Indentation
C. Wear
D. Scratch
✅ The correct answer is option A.
460. Which of the following is not a cupro-nick-el alloy?
A. German silver
B. Monel metal
C. Muntz metal
D. None of these
✅ The correct answer is option C.