Which of the following oils is obtained by boiling fats and other parts of cattle with water?

We can obtain lake asphalt from lakes at _____

Which of the following is not a property of asphalt?

The binding material present in asphalt is ______

Which of the following is not true about cork?

The presence of cobalt in cement imparts _____ colour.

Portland cement was invented by _______

Which of the following is also known as residual asphalt?