The specific gravity of Ordinary Portland Cement is about:

• 2.25

• 2.75

• 3.15

• 3.50

Initial setting time of OPC (IS Code requirement) should not be less than:

• 10 min

• 20 min

• 30 min

• 60 min

Final setting time of OPC should not exceed:

• 3 hrs

• 6 hrs

• 10 hrs

• 24 hrs

Normal consistency of cement paste is:

• 10-15%

• 20-25%

• 26-33%

• 40-50%

Fineness of cement is tested using:

• Vicat apparatus

• Blaine's Air Permeability test

• Le Chatelier test

• Los Angeles abrasion test

The main compound responsible for early strength in cement is:

• C2S

• C3S

• C3A

• C4AF

The compound responsible for high heat of hydration in cement is:

• C3S

• C3A

• C2S

• C4AF

Rapid hardening cement is rich in:

• C2S

• C3S

• C4AF

• MgO

The main ingredient of Portland cement is:

• Lime

• Silica

• Alumina

• Iron oxide

White cement is produced by reducing:

• Silica

• Alumina

• Iron oxide

• Magnesium