Specific Gravity of Cement and Aggregates

The purpose of using fine aggregate in concrete is to
Which of the following will float in water? The density of water is 1g/ml
Presence of large number of deleterious materials on aggregate results in high Specific Gravity value.
The Specific Gravity of cement is greater than 3.19, it indicates that
According to the IS Code, Zone IV aggregate is finer than Zone I aggregate.