291. As per IS specifications, the maximum final setting time for ordinary Portland cement should be_______________?
A. 30 minutes
B. 1 hour
C. 6 hours
D. 10 hours
✅ The correct answer is option D.
Civil Engineering
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292. Center of buoyancy is the___________________?
A. centroid of the displaced volume of fluid
B. center of pressure of displaced volume
C. e.g. of floating ‘body
D. does not exist
✅ The correct answer is option A.
293. The preparation of surface of stone to obtain plain edges or to obtain stones of required size and shape is known as______________?
A. quarrying of stones
B. blasting of stones
C. seasoning of stones
D. dressing of stones
✅ The correct answer is option D.
294. Mach number is significant in___________________?
A. supersonics, as with projectiles and jet propulsion
B. full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C. simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
D. all of fhe above
✅ The correct answer is option A.
295. Based on the following rocks and minerals, select the correct statement, quartz, shale, basalt, granite, marble, gypsum, mica______________?
A. basalt and marble are the only metamorphic rocks
B. there is no sedimentary rock
C. granite is the only igneous rock
D. quartz and mica are minerals
✅ The correct answer is option D.
296. What is used to record historical financial transactions ?
A. Bookkeeping system
B. Ledger system
C. Balance check
D. General journal system
✅ The correct answer is option A.
297. First class timber has an average life of_____________?
A. less than one year
B. 1 to 5 years
C. 5 to 10 years
D. more than 10 years
✅ The correct answer is option D.
298. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true
✅ The correct answer is option A.
299. Mansard roof is a roof which slopes in________________?
A. two directions without break in the slope on each side
B. two directions with break in the slope on each side
C. four directions without break in the slope on each side
D. four directions with break in the slope on each side
✅ The correct answer is option D.
300. In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to_________________?
A. increase the depth of foundation
B. drain the soil
C. compact the soil
D. replace the poor soil
✅ The correct answer is option D.