799. Natural water contains approximately __________ percent of heavy water.
A. 0.015
B. 0.71
C. 1.2
D. 3.5
✅ The correct answer is option A.
802. Tungsten in high speed steel is responsible for its
A. Toughness & wear resistance
B. Cold hardness
C. Hot hardness
D. Sharp cutting edge
✅ The correct answer is option C.
805. Force between the molecules of the same substance is called __________ force.
A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls
✅ The correct answer is option B.
808. Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then
A. It will deliver low discharge of liquid
B. Its efficiency will not be affected
C. It will not develop sufficient head to raise water
D. It will be cavitated
✅ The correct answer is option B.
811. An oxidation process is accompanied with decrease in the
A. Number of electrons
B. Oxidation number
C. Number of ions
D. All of the above
✅ The correct answer is option A.
813. Materials having __________ lattice structure are usually the most ductile.
A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
D. None of these
✅ The correct answer is option C.
815. __________ of air does not increase with increase in temperature.
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity
✅ The correct answer is option A.
778. Maximum permissible air velocity in pipelines is about __________ metre/second.
A. 5
B. 10
C. 20
D. 40
✅ The correct answer is option B.
780. Globular form of cementite is formed during the __________ process.
A. Spherodising
B. Hardening
C. Annealing
D. Normalising
✅ The correct answer is option B.
782. The product out from a cupola is called
A. Wrought iron
B. Pig iron
C. Cast iron
D. None of these
✅ The correct answer is option C.