Specific Gravity of Fly Ash is in the range of
- A2.1 to 3.0Correct
- B3.1 to 4.0
- C4.1 to 5.0
- D5.1 to 6.0
Solution
Concept
Fly ash is lighter than cement. Its specific gravity is about 1.9 to 2.9.
Step-by-step solution
1. Fly ash is a by-product of thermal power plants. 2. Its specific gravity is usually about 2.1 to 2.6 (range about 1.9 to 2.9). 3. Cement has a specific gravity of 3.15, and fly ash is lower than this. 4. So the answer is option A.
Explanation
Fly ash is a waste product from coal-based power plants. Its specific gravity is less than cement, usually about 2.1 to 2.6. So the range 2.1 to 3.0 is correct.
Why the other options are wrong
B, C, D: These values are higher than cement (3.15). Fly ash is lighter than cement.
Shortcut
Fly ash is lighter than cement (3.15), so its value is below 3.
Common mistake
Taking the specific gravity of fly ash as equal to cement (3.15).
Correct answer: A) 2.1 to 3.0