302. What is the pH of distilled water?
A. 0
B. 1
C. 7
D. 14
✅ The correct answer is option C.
267. The moment of inertia of a body comes into play in __________ motion.
A. Curvilinear
B. Linear
C. Rotational
D. None of these
✅ The correct answer is option C.
270. An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.
A. Adiabatic
B. Isothermal
C. Isentropic
D. Isochoric
✅ The correct answer is option B.
272. Potable water means the water used for
A. Fire-fighting
B. Cooling
C. Drinking
D. Evaporation to produce steam
✅ The correct answer is option C.
274. Failure of a material is attributed to __________ if it fails below its yield point.
A. Impact loading
B. Fatigue
C. Creep
D. Straining
✅ The correct answer is option B.
276. Coating of zinc over steel is known as
A. Cladding
B. Galvanising
C. Anodising
D. Passivation
✅ The correct answer is option B.
278. Change in volume of metals from absolute zero temperature to their melting points is
A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals
✅ The correct answer is option A.
280. In hot working, dynamic recovery occurs in
A. Metals of low stacking fault energy
B. Metals of high stacking fault energy e.g. α-iron
C. Single crystal of Ni-based superalloys
D. None of these
✅ The correct answer is option B.
282. Which of the following is not an ore of iron?
A. Chalcopyrite
B. Magnetite
C. Hemetite
D. Limonite
✅ The correct answer is option A.
284. When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
A. The ball abandons its circular path for a parabolic path
B. The ball abandans its parabolic path for a circular path
C. The ball continues to move on a circular path
D. The ball continues to move on a parabolic path
✅ The correct answer is option A.