Questions

Impact Analysis is used in software testing to define all the risks associated with any kind of changes in a product being tested.

Impact Analysis is nothing but analyzing the impact of changes in the deployed product or application. It gives the information about the areas of the system that may be affected due to the change in the particular section or features of the application.

Why Impact Analysis is done :

1. It is done to understand the possible outcome of implementing the change. Inducing too much functionality into a product can reduce the overall performance of the product.

2. To identify all the files, documents and models that might have to be modified if team decides to implement the change in product

3. To estimate the effort needed behind implementing the change

4. To identify the task required to implement the change

5. It will list the dependencies on a specific element

The impact is analyzed on Requirements, Design & Architecture, impact on Test and impact on schedule.

Graphite is a covalent-network type of crystalline solid.

There are two main categories of solids.

1. Crystalline solids and

2. Amorphous solids.

Crystalline solids are those in which the atoms, ions, or molecules that make up the solid exist in a regular, well-defined arrangement.

There are four types of crystalline solids :

Ionic solids :— Made up of positive and negative ions and held together by electrostatic attractions. They’re characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.

Molecular solids :— Made up of atoms or molecules held together by London dispersion forces, dipole-dipole forces, or hydrogen bonds. Characterized by low melting points and flexibility and are poor conductors. An example of a molecular solid is sucrose.

Covalent-network (also called atomic) solids :— Made up of atoms connected by covalent bonds; the intermolecular forces are covalent bonds as well. Characterized as being very hard with very high melting points and being poor conductors. Examples of this type of solid are diamond and graphite, and the fullerenes. As you can see below, graphite has only 2-D hexagonal structure and therefore is not hard like diamond. The sheets of graphite are held together by only weak London forces!

Metallic solids :— Made up of metal atoms that are held together by metallic bonds. Characterized by high melting points, can range from soft and malleable to very hard, and are good conductors of electricity.

RNA has hydroxy group attached at the 2nd C-atom while DNA does not.