Cement

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Which of the following statements with regard to Portland cement are correct? 1. Silica imparts strength to cement. Alumina makes the cement quick setting 3. Excess of lime increases the strength of cement. 4. Calcium sulphate decreases the initial setting time of cement. Select the correct answer using the code given below :

Statement I : During the setting of cement the structure has to be cooled by spraying water. Statement II: The constituents of cement undergo hydration during setting of cement and it is exothermic reaction.

A cement company earns a profit of Rs 8 per bag of white cement sold and a loss of Rs 5 per bag of grey cement sold. (a) The company sells 3,000 bags of white cement and 5,000 bags of grey cement in a month. What is its profit or loss? (b) What is the number of white cement bags it must sell to have neither profit nor loss, if the number of grey bags sold is 6,400 bags

A shopkeeper earns a profit of Rs. 8 per bag from a bag of white cement sold and suffers a loss of Rs. 5 per bag from a bag of grey cement sold. A company buys 3000 bag of white cement and 5000 bags of grey cement from him. What will be the amount of his profit or loss?