Highway Materials MCQ with answer and solution

Concept

Paving bitumen in India is graded by viscosity at 60°C as VG-10, VG-20, VG-30 and VG-40.

Step-by-step solution

1. Recall the viscosity grades of paving bitumen used in India: VG-10, VG-20, VG-30, VG-40. 2. Check each option: VG-40, VG-20 and VG-30 are in the list. 3. VG-50 is not a standard viscosity grade. 4. So the answer is (B).

Explanation

In India, paving bitumen is graded by its viscosity at 60°C. The four standard grades are VG-10, VG-20, VG-30 and VG-40. VG-50 is not a standard grade.

Why the other options are wrong

VG-40, VG-20 and VG-30 are all standard viscosity grades, so they are not the answer.

Shortcut

Remember 10-20-30-40: four grades that end at VG-40.

Common mistake

Thinking VG-50 exists because of old penetration grades like 50/60 or 60/70.