Questions

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

If an object moves with some velocity that means the magnitude and direction of the object changes i.e, the object moves with some acceleration. Hence, if the object moves with constant velocity, no change in direction and magnitude of speed i.e, no acceleration = 0 acceleration.

Customer Satisfaction means, dealing with the customer in a proper or positive way. Every individual mindset is  different so their cause and satisfactory leave also changed. So the main challenge of a worker of a call center is to make them understand that they are also concerned about their trouble.

The parameters of Quality Cost are:

Speed
Accuracy
Efficiency
Performance
Customer Satisfaction