851. Electrochemical corrosion occurs
A. Where the liquid electrolytes containing free ions are present
B. Only in alloys
C. Only in pure metals
D. Due to direct chemical action of metal with oxygen
✅ The correct answer is option A.
Engineering
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852. The ratio of coil diameter to wire diameter of a spring is called the spring
A. Index
B. Deflection
C. Form co-efficient
D. None of these
✅ The correct answer is option A.
853. Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is
A. Very low which prevents their ignition by compression
B. Very high which prevents their ignition by compression
C. Zero
D. None of these
✅ The correct answer is option A.
854. Oxyacetylene reducing flame is used while carrying out welding on
A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel
✅ The correct answer is option C.
855. Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution
A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₂ is very slightly acidic
D. Both B & C
✅ The correct answer is option D.
856. Which of the following properties of a solid is not dependent on crystal imperfection ?
A. Ductility
B. Semiconductiyity
C. Melting point
D. Yield stress
✅ The correct answer is option C.
857. Flywheel is provided in a machine to
A. Provide structural strength to the shaft
B. Smoothen the power impluses
C. Help in quick starting of the machine
D. None of these
✅ The correct answer is option B.
858. Material of construction of the electrode used in the electric resistance welding is
A. Stainless steel
B. Graphite
C. Copper
D. Steel
✅ The correct answer is option C.
859. ‘Ice point’ is designated on Farenhite temperature scale by
A. 0°
B. 32°
C. 62°
D. 212°
✅ The correct answer is option B.
860. Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
✅ The correct answer is option B.