# Free Introduction to Graphs 02 Practice Test - 8th Grade

Students in a class voted on their favorite fruit. Each student voted once. The bar graph below summarizes the data collected from the class vote. The total number of students who voted is 19.

A.

True

B.

False

#### SOLUTION

Solution : A

The total number of students who voted is the sum of the number of votes for each fruit. This is 5+3+2+4+1+4=19.

Which two fruits are liked by equal number of students?

A.

Mangoes, Oranges

B.

Pears, Grapes

C.

Bananas, Oranges

D.

Apples, Mangoes

#### SOLUTION

Solution : A

From the graph, it can be observed that number of students who like oranges and mangoes is 4.

In this case, lengths of bars corresponding to mangoes and oranges are same.

A bar graph is used to show ____________.

A.

comparison among categories

B.

comparison among pictures only

C.

comparison among data in intervals

D.

Percentage difference between two quantities

#### SOLUTION

Solution : A

A bar graph is a chart that presents data with rectangular bars for different categories. The bars have lengths proportional to the values that they represent.

Why are there no gaps between bars in a histogram?

A.

The graph must look symmetric.

B.

The data is grouped.

C.

It is the followed convention.

D. It is easy to compare.

#### SOLUTION

Solution : B

A histogram is a representation of continuous data that are grouped into classes. There are no gaps between the bars in a histogram because the classes are continuous.

What is the difference between runs scored by batsmen '3' and '5'?

A.

10

B.

20

C.

30

D.

40

#### SOLUTION

Solution : D

From the given line graph, we have:
The runs scored by batsman 3=10

The runs scored by batsman  5=50
required difference in scores =(5010)=40

A graph which displays data that changes continuously over a period of time is __ graph.

#### SOLUTION

Solution :

A line graph can be used to display data that changes continuously over a period of time.

Find the perimeter of the square?

A.

16 cm

B.

8 cm

C.

4 cm

D.

2 cm

#### SOLUTION

Solution : B

Perimeter of the square =4a (where a is length of side)

Length of side of square = 2 cm

Perimeter of the square = 4 × 2= 8 cm

Representation of data in form of sectors of a circle is called __ chart.

#### SOLUTION

Solution :

Representation of data in form of sectors of a circle is called pie chart.

Two points A & B are plotted on a graph with coordinates (2,3) and (3,2) respectively. The points A and B will coincide.

A.

True

B.

False

#### SOLUTION

Solution : B

For point A, X-coordinate= 2 Y-coordinate=3

For point B , X-coordinate = 3 Y-coordinate=2

Hence, they will not coincide.

The content of the carbon dioxide in the air is 500 ppm(parts per million). What is the content of Oxygen in the air ?

A.

300 ppm

B.

150 ppm

C.

200 ppm

D.

None of these

#### SOLUTION

Solution : A

From pie chart, we can see that the content of carbon dioxide is 25% which is equal to 500 ppm.

So, total gas present in the atmosphere = 500×10025 = 2000 ppm

Oxygen content is 15% = 2000×15100 = 300 ppm.