Questions

Mutex is a program object that allows multiple program threads to share the same resource, such as file access, but not simultaneously. When a program is started a mutex is created woth a unique name. After this stage, any thread that needs the resource must lock the mutex from other threads while it is using the resource. the mutex is set to unlock when the data is no longer needed or the routine is finished.

Integration testing is done at module level when various modules are integrated with each other to form a system or sub-system. Its main purpose is to ensure that interfaces between various modules are working properly; i.e. modules which are working individually are also working correctly together.

System testing is done on a complete, integrated system to evaluate the system’s compliance with its specified requirements. It validates that the system meets its functional and non-functional requirements.

From these definitions, it is clear that the purpose of Integration and purpose of System Testing are different. Therefore, Integration test cases focus more on the interfaces between modules (interface integrity) - the data transfer and their interaction with each other. System test cases focus on testing the product as a whole; i.e. whether the functional, non-functional requirements of the System are met or not. Since System Testing is the final phase before delivery of the product, System test cases should pinpoint configuration related errors along with testing for performance, security, reliability etc.

This section identifies and describes the five Project Management Process Groups required for any project. These five process Groups have clear dependencies and are performed in the same sequence on each project.

The five Process Groups are :

Initiating  Process Group - Defines and authorizes the project or a project phase

Planning Process Group - Defines and refines objectives, and plans the course of action required to attain the objectives and scope that the project was undertaken to address.

Executing Process Group - Integrates people and other resources to carry out the project management plan for the project

Monitoring and Controlling process Group - Regularly measures and monitors progress to identify variances from the project management plan so that corrective action can be taken when necessary to meet project objectives.

Closing Process Group - Formalizes acceptance of the product, service or result and brings the project or a project phase to an orderly end.

Let speed of slower train = 2x
⇒ speed of faster train = 5x
ATQ, (150 + 200)/(2x + 5x) = 15
x = 10/3
Time required=350/[50/3–20/3]= 35 seconds

The chemical composition of a rock is mainly minerals.

The homework should be checked by the teacher