Questions

In a multiprocessor system there exist several caches each may containing a copy of same variable A. Then a change in one cache should immediately be reflected in all other caches this process of maintaining the same value of a data in all the caches s called cache-coherency.

Yes, it can be used, if an accurate clock frequency  is not required. also the component cost is low compared to LC or Crystal.

Metamorphism is the method of changing the structure of a rock by using heat and temperature.

Hence, for this to happen the parent rock must be in solid form only. Therefore, option C) is true.

The capacity of a water heater is measured in Gallons or Liters. In the USA, it is measured in Gallons and in India, we measure it in Liters.

Hence, if the capacity of the water heater is 15 gallons or 15 liters, then it says that it can hold 15 gallons or 15 liters of water.

A Project is a temporary endeavour undertaken to create a unique product, service or result.

Characteristics:

1.Temporary 

    Temporary means that every project has a definite beginning and a definite end.

2. Unique Products, Services or Results

   Uniqueness is an important characteristic of project deliverables. For example, many thousands of office buildings have been developed, but each individual facility is unique - different owner, different design, different location, different contractors, and so on.

3. Progressive Elaboration

   Progressive elaboration means developing in steps, and continuing by increments . For example, the project scope will be broadly described early in the project and made more explicit and detailed as the project team develops a better and more complete understanding of the objectives and deliverables.

The process which involves absorption of heat is endothermic.

Here given all the options are involving in absorption of heat. Hence, all the above are endithermic.