What is the temperature of the tensile strength of the stone in water for 3 days ?
- A40°C to 50°C
- B10°C to 15°C
- C20°C to 30°CCorrect
- D5°C to 15°C
Solution
Concept
Standard temperature for stone tests in water
Step-by-step solution
1. Stone specimens are tested after soaking in water at normal laboratory (room) temperature. 2. The standard test temperature range is about 20°C to 30°C (27 ± 2°C).
Explanation
Tests on stone that involve immersion in water are carried out at ordinary room temperature, taken as 27 ± 2°C, so the range 20–30°C fits.
Why the other options are wrong
40–50°C is far above the standard, and 5–15°C and 10–15°C are colder than standard laboratory conditions.
Shortcut
Lab standard temperature = 27 ± 2°C.
Common mistake
Choosing a hot-water range.
Correct answer: C) 20°C to 30°C