121. Disposable patterns are made of
A. Metal
B. Polystyrene
C. Rubber
D. Wood
✅ The correct answer is option B.
Engineering
Boost your preparation with the latest Engineering MCQs with answers and explanations. Our collection covers civil engineering, electrical engineering, mechanical engineering, electronics, software engineering, and other core subjects. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and job interviews. Practice online with updated Engineering MCQs to strengthen concepts, improve technical knowledge, and perform better in exams and recruitment tests.
122. Filler metal is not used in the __________ welding.
A. Seam
B. Electric spot
C. Projection
D. All of the above
✅ The correct answer is option D.
123. The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the
A. Resilience
B. Toughness
C. Ductility
D. Impact strength
✅ The correct answer is option A.
124. Chromium molybdenum steel can not be welded using __________ welding.
A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these
✅ The correct answer is option B.
125. Use of flux during soldering is done to
A. Increase flidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
D. Full up the joint gap
✅ The correct answer is option B.
126. Optical activity is a/an __________ property.
A. Additive
B. Constitutive
C. Both A & B
D. Neither A nor B
✅ The correct answer is option C.
127. The concentration of (H⁺) ions is 4 x 10⁻⁵ in a solution. Then pH of the solution will be (Given log 4 = 0.6 )
A. 4.4
B. 5.6
C. 8.4
D. 2.4
✅ The correct answer is option A.
128. Pick out the wrong statement about the machinability of metals. Machinability of a metal
A. Decreases with increase in strain hardening tendencies
B. Decreases with increase in hardness, in general
C. Depends on the composition, microstructure and physical & mechanical properties
D. Decreases with increases in tensile strength & decrease in grain size
✅ The correct answer is option D.
129. Closeness of packing is maximum in case of __________ crystal lattice.
A. Face centred
B. Simple cubic
C. Body centred
D. None of these
✅ The correct answer is option A.
130. The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?
A. Cassiterite
B. Sphalerite
C. Chalcopyrite
D. Calcite
✅ The correct answer is option D.