313. The maximum value, which the residual stress in a material can reach is the __________ of the material.
A. Elastic limit
B. Plastic limit
C. Yield stress
D. Breaking stress
✅ The correct answer is option A.
316. The difference in the properties of a substance in three states of matter depends upon the
A. Binding energy of atoms
B. Difference in molecular shape
C. Difference in intermolecular forces
D. None of these
✅ The correct answer is option C.
319. Broaching tools are usually made of
A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite
✅ The correct answer is option B.
322. Biological shield in a nuclear reactor is generally provided to protect against the
A. α-rays
B. β-rays
C. Gamma rays & neutrons
D. Electrons
✅ The correct answer is option C.
325. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
A. Hard
B. Soft
C. Silicon carbide
D. Aluminium oxide
✅ The correct answer is option D.
327. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection
✅ The correct answer is option D.
329. Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?
A. Galvanising
B. Tinning
C. Sheardising
D. None of these
✅ The correct answer is option C.
331. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area ; in the casting)
A. V/A
B. V/A²
C. V²/A
D. V²/A²
✅ The correct answer is option D.
333. Lead pencil contains
A. Graphite
B. Lead sulphide
C. Lead
D. Both B & C
✅ The correct answer is option A.
335. Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?
A. Cobalt: It contributes to rerl hardness by hardening ferrite
B. Molybdenum: It forms abrasion resisting particles
C. Phosphorous: It improves machinability in free cutting steels
D. Silicon: It reduces oxidation resistance
✅ The correct answer is option A.