9. Which one is not the main consitituent of portland cement? [কোনটি পোর্টল্যান্ড সিমেন্টের প্রধান উপাদান নয়?]
উত্তর সহ কয়েকটি অনুরুপ গুরুত্বপূর্ণ প্রশ্ন
1. Pick up the correct statement from the following:-
A soil having pH value less than 7 is an acidic soil
2. For road pavements, the cement generally used, is- Rapid hardening cement
3. For construction of structures in sea water, the cement generally preferred to, is-Fortland-pozzolana
4. For the construction of thin R.C.C. structures, the type of cement to be avoided, is-Blast furnace slag Cement
5. The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as Low-heat Fortland cement