11. Which of the following is the softest material?
12. Work index is defined as the
13. The equivalent diameter of channel of a constant non-circular cross-section of 3 cm by 6 cm will be __________ cms.
14. Which of the following is the hardest material?
15. Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
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