Hi Aspirants,

With only a few days left for **CSIR NET 2021** exam, you should devote all your time in revising your concepts and topics. Practice as many mocks as you can to work on your speed and accuracy. At this high time, you should practice a lot of questions of those topics which have high chances of being asked in the exam. **Bar Graph** is one of the important and most scoring topics of the **General Aptitude (Part A)** through which one can score full marks in this section.

To help you in your preparation, we have come up with the concept of the **Bar Graph** for the upcoming exam CSIR-NET 2021. Scroll down the article below and learn this concept to crack the exam.

## Concept of Bar Graph

Bar graph is a part of Data Interpretation. Bar Graph is normally said to be one of the simplest and the most common types DI that comes in the examination. It consists of a number of rectangular bars, one for each category of the data in which the magnitudes are represented by the length or height of the rectangles, whereas width of rectangles is arbitrary and immaterial.

For solving the Bar Graph question, one must be aware of the following arithmetical topic-

- Ratios
- Averages
- Percentages

Now let’s go through the most common type of BAR Graph that was asked in the examination-

__TYPES OF BAR GRAPH__

The various types of bar diagrams that are most

commonly used are mentioned below:

- Percentage Bar Diagram
- Multiple Bar Graph
- Simple Bar Graph
- Sub-divided Bar Graph

**1. Percentage Bar Diagram **

The bar diagram which is presented graphically on a percentage basis is known as the percentage bar diagram. It is very useful for the diagrammatic representation of the relative changes in the data. A percentage bar diagram is mainly used to highlight the relative importance of the different component parts to the whole. In this type of bar diagram all totals are taken as 100 & then represented by bars of the same length. The component parts are expressed as the total percentage.

**Example: **

**Direction:** Study the following information carefully and answer the related questions.

Pie-chart shows the percentage of valid votes obtained by seven candidates of a college who were nominated for the post of college secretary.

Total votes = 5000

It is given that 7% votes are invalid.

Valid votes obtained by A, E and F together is how much more than the valid votes obtained by remaining four candidates?

- 300
- 372
- 420
- None of these

**Answer **- B

Solution- Total valid votes =

Votes of A = 744

Votes of B = 1023

Votes of C = 186

Votes of D = 558

Votes of E = 837

Votes of F = 930

Votes of G = 372

Votes obtained by A, E and F together = 744 + 837 + 930 = 2511

Valid votes obtained by remaining four candidates = 1023 + 186 + 558 + 372 = 2139

Difference = 2511 – 2139 = 372

Hence, votes obtained by A, E and F is 372 more than votes obtained by the remaining four candidates.

**2. Multiple Bar Graph**

This bar graph shows the relationship between different values of data. In a multiple bar graph, each data value is represented by a column in the graph. In this type of bar graph, multiple data points for each category of data are displayed with the addition of columns. These are also used to show two or more sets of interrelated data.

The labels are kept in the X-axis and their respective frequencies are used in the Y-axis. These frequencies are plotted in the column section. The bars for different phenomena for a particular year are displayed adjacent to each other. Proper & equal spacing is given between the different sets of a bar graph.

**Example:**

The given bar graph shows the imports and exports (in ` crores) of steel by a country from 2013 to 2017.

The total imports of steel in 2014, 2016 and 2017 Is what percent less than the total exports in 2013, 2015 and 2017 (correct to one decimal place)?

- 16.2
- 13.4
- 14.5
- 15.8

Answer-C

Solution-

Import _{(2014 + 16 + 17)} = 360 + 500 + 550 = 1410

Export _{(2013 + 15 + 17)} = 400 + 600 + 650 = 1650

**3. Simple Bar Graph**

The simple bar graph is used to represent data involving only one variable classified on a quantitative or temporary basis. In this type of bar graph, the bars of equal width but variable length are displayed. This means that the magnitude of variables is represented by the height or length or rectangles of the bars.

A simple bar diagram is known as the simplest and easiest form of a bar graph.

**Example:**

Study the given graph and answer the question that follows.

The expenditure on Interest on Loans is by what percentage more than the expenditure on Taxes?

- 50%
- 40%
- 25%
- 30%

**Answer **- A

Solution -

Percentage of expenditure on Interest on Loans = 7.5%

Percentage of expenditure on taxes = 5%

Difference = 7.5% - 5% = 2.5%

**4. Sub-divided Bar Graph**

A sub-divided bar diagram is used to present data which are having two or more components. Sub-divided bar graph is used to represent data in which the total magnitude is divided into different information or components.

A simple bar graph is able to represent only one characteristic at a time. Soo for this limitation simple bar graph is overcome by subdivided bar graph. In this, the total bar is divided into its component parts.

**Example:**

The bar graph given here shows the number of jobseekers of a state in various years at different stages of education.

In which year was the number of Graduate job-seekers the same

as that of Senior Secondary jobseekers?

(A) 1973

(B) 1974

(C) 1975

(D) 1976

**Answer **- (B)

Solution-

Number of Graduate job seekers in 1974 = 525

Number of Senior secondary job-seekers in

1974 = 1050 – 525 = 525

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