A. Ceramic fibre blanket
B. Glass wool and 85% magnesia
C. Vermiculite
D. Slag wool
Related Mcqs:
- Vycor, a widely used material for making ‘thermal wells’ in temperature measurement, is a_______________?
A. Cermet
B. Glass
C. Thermosetting plastic
D. Metallic alloy - _____________ steel is widely used for the manufacture of motor car crankshafts?
A. Silicon
B. Nickel
C. Chrome
D. High speed - Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?
A. Ultimate tensile strength (U.T.S.)
B. Endurance limit
C. Elastic limit
D. None of these - Lead pipes are not safe for carrying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)2. Lead pipes are readily corroded by___________________?
A. Dilute HCl
B. Acetic acid
C. Concentrated H2SO4
D. None of these - Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by_________________?
A. Dilute HCI
B. Acetic acid
C. Concentrated H2SO4
D. None of these - Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70% ?
A. Cast iron
B. Steel
C. Nickel
D. Karbate - Which of the following is the hardest material ?
A. Topaz
B. Quartz
C. Corundum
D. Fluorite - Which of the following is the softest material ?
A. Quartz
B. Calcite
C. Corundum
D. Fluorite - The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
A. Lead
B. Copper
C. Aluminium
D. Wrought iron - Which of the following is the most elastic material ?
A. Plastic
B. Glass
C. Steel
D. Rubber
