1. In ‘Float Glass' manufacturing, the molten glass coming out of the furnace is allowed to float on:
(a) Molten Lead
(b) Steel Plate
(c) Molten Zinc
(d) Molten Tin
Answer: (d)
2. When rain water falls on hot bricks, the deformed shape is called:
(a) Checks
(b) Chuffs
(c) Spots
(d) Blisters
Answer: (b)
3. The Cement Clinker formed consequent to burning contains the Bogue compound called ‘Belite’ which has the chemical formula:
Answer: (c)
4. Which one of the following components in cement has to be minimized to qualify as Low Heat Cement (LHC)?
(a) Tricalcium Silicate
(b) Dicalcium Silicate
(c) Tricalcium Aluminate
(d) Tetra Calcium Alumina Ferrite
Answer: (c)
5. The rate of creep decreases with time; creep strains after what duration are taken as terminal values?
(a) 5 yrs
(b) 6 yrs
(c) 7 yrs
(d) 8 yrs
Answer: (a)
6. As per IS : 383 – 1970, percentage passing of sand from 600 micron sieve by weight for Zone-I and Zone-II sands are, respectively:
(a) 30−70 and 55−90
(b) 15−34 and 35−59
(c) 60−95 and 75−100
(d) 05−20 and 08−30
Answer: (b)
7. The most suitable aggregate for high strength concrete and for pavements is:
(a) Rounded aggregates
(b) Irregular aggregates
(c) Angular aggregates
(d) Flaky aggregates
Answer: (c)
8. The best method of placing concrete underwater is by:
(a) Pipes and pumps
(b) Bottom Dump Buckets
(c) Termie Pipe
(d) Filling cement bags with dry and semi-dry mix of cement and aggregates
Answer: (c)
9. A steel cube of 200 mm is placed at a depth of 4 km in sea. For steel 𝐸𝐸=208 GPa, 𝜈=0.29 and the density of sea water is 0.01 Newton per centimeter cube. The change in volume of the cube will be nearly:
10.
(a) 24° and 114°
(b) 10° and 100°
(c) 12° and 102°
(d) 100° and 190°
Answer: (c)
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