Discussion
In the penetration test for bitumen, the least count in the penetrometer is:
Answer: B
The least count of the penetrometer is 0.1 mm.
In the penetration test, a standard needle under a 100 g load is allowed to penetrate a bitumen sample at 25°C for 5 seconds. Penetration is reported in units of 0.1 mm (1/10 mm), so the dial reads to 0.1 mm; a bitumen of grade 80/100 penetrates 8 to 10 mm.
1 mm would be too coarse to distinguish grades, while 0.01 mm and 0.001 mm are finer than the test reports.
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