Chapter Exam

Chapter 12: Tales by Dots and Lines — Online MCQ Test

Q: In a line graph, what does the horizontal axis usually represent?

Answer: B. Categories or time — The horizontal axis commonly shows time or categories in a line graph. The data values are usually shown on the vertical axis.

Q: Which of the following is the arithmetic mean of 6, 8, 10, and 12?

Answer: C. 10 — The sum is 36 and there are 4 numbers. So, the mean is 36 ÷ 4 = 9.

Q: The points on a line graph are joined by:

Answer: B. Straight line segments — In a line graph, data points are usually connected by straight line segments. This helps show the change between values.

Q: The marks of a student in 5 subjects are 65, 70, 75, 80, and 90. Which statement is correct?

Answer: A. The mean is 75 — The total is 380 and there are 5 subjects. So, the mean is 380 ÷ 5 = 76, not 75.

Q: If the points (2, 5), (4, 7), and (6, 9) are plotted on a line graph, what pattern do they show?

Answer: B. Increase by 2 each time — The y-values go 5, 7, 9, which increase by 2 each time. This shows a regular upward trend.

MATHS · Grade 8 · CBSE(NCERT)

Practice Chapter 12: Tales by Dots and Lines with a free chapter-wise online MCQ test for CBSE(NCERT) Grade 8 MATHS. This chapter covers: Line Graph Data Analysis Arithmetic Mean Average Trend Interpretation Coordinates Graphical Representation Data Collection Comparison Statistical Reasoning Visualization of numeric.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 12: Tales by Dots and Lines — Important Questions & Answers (FAQ)

Frequently asked questions from CBSE(NCERT) Grade 8 MATHS — Chapter 12: Tales by Dots and Lines, with answers and explanations. These are sample questions; the exam has its own separate question set.

In a line graph, what does the horizontal axis usually represent?

A. Data values
B. Categories or time ✓
C. Only averages
D. Only the highest value

Answer: B. Categories or time
The horizontal axis commonly shows time or categories in a line graph. The data values are usually shown on the vertical axis.

Which of the following is the arithmetic mean of 6, 8, 10, and 12?

A. 8
B. 9
C. 10 ✓
D. 11

Answer: C. 10
The sum is 36 and there are 4 numbers. So, the mean is 36 ÷ 4 = 9.

The points on a line graph are joined by:

A. Curved lines only
B. Straight line segments ✓
C. Dots only, not joined
D. Arrows

Answer: B. Straight line segments
In a line graph, data points are usually connected by straight line segments. This helps show the change between values.

The marks of a student in 5 subjects are 65, 70, 75, 80, and 90. Which statement is correct?

A. The mean is 75 ✓
B. The mean is 76
C. The mean is 78
D. The mean is 80

Answer: A. The mean is 75
The total is 380 and there are 5 subjects. So, the mean is 380 ÷ 5 = 76, not 75.

If the points (2, 5), (4, 7), and (6, 9) are plotted on a line graph, what pattern do they show?

A. Decrease by 2 each time
B. Increase by 2 each time ✓
C. No change
D. Random values

Answer: B. Increase by 2 each time
The y-values go 5, 7, 9, which increase by 2 each time. This shows a regular upward trend.

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