Civil Engineering MCQJE Level Civil Engineering
The penetration test for bitumen (IS 1203) measures penetration of a standard needle under a load of 100g for 5 seconds at 25°C. The result is expressed in units of:
Transportation EngineeringBituminous MaterialsHARD
Choose the correct answer
A
mm
B
0.1 mm
C
cm
D
N/mm²
Correct Answer
B. 0.1 mm
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Penetration is reported in units of 0.1 mm. A penetration value of 60 means the needle penetrated 6 mm. Lower penetration = harder bitumen (e.g., 30/40 grade for warm climates), higher = softer (80/100 for cold climates).
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