655. Kinematic viscosity of water as compared to that of air is
A. More
B. Same
C. 15% more
D. 15% less
✅ The correct answer is option D.
658. Colloids can be purified by
A. Dialysis
B. Reverse osmosis
C. Coagulation
D. Peptization
✅ The correct answer is option A.
661. Ceramic tips for the cutting tool are prepared from __________ powder.
A. Carbon
B. Silicon carbide
C. Aluminium oxide
D. Tungsten
✅ The correct answer is option C.
664. Coarse grained steels have
A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness
✅ The correct answer is option B.
627. Which one of the following is incombustible ?
A. H₂
B. CCl₄
C. C₂H₂
D. S
✅ The correct answer is option B.
630. Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.
A. Printing
B. Developing
C. Colour
D. Fixation
✅ The correct answer is option B.
633. Largest application of laser welding is in __________ welding.
A. Microspot
B. Under water
C. Precious metals
D. Heavy structure
✅ The correct answer is option A.
636. At the point of boundary layer separation in fluid flow, the
A. Shear stress is maximum
B. Velocity gradient is flat
C. Density variation is maximum
D. Shear stress is zero
✅ The correct answer is option A.
639. 1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).
A. 10000
B. 1000
C. 100
D. 10
✅ The correct answer is option A.
622. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/ cm².
A. 273.15
B. 225.65
C. 100.03
D. 373.15
✅ The correct answer is option B.