Line Charts— Concepts, Formulas & Shortcuts
- Slope means rate of change — steeper segments indicate faster growth or decline.
- A falling line can still show positive values; falling means decreasing, not negative.
- The point where two lines cross is where the two quantities are equal.
- For "maximum increase", compare consecutive differences, not the absolute heights.
- Percentage change always divides by the earlier (base) value.
- Read the axis scale carefully — line charts often start the y-axis above zero, exaggerating the slope.
Line Charts Practice Questions with Answers
Attempt each question first, then open the explanation. All 18 questions below are free to read and require no signup.
Q1.A line chart shows monthly revenue (₹ lakh): Jan 40, Feb 45, Mar 50, Apr 48, May 60. Total revenue for the five months is:
Easy- A₹233 lakh
- B₹238 lakh
- C₹243 lakh
- D₹248 lakh
Line Charts question 1 of 18+Show Answer & Explanation
Answer: C. ₹243 lakh
Explanation: 40 + 45 + 50 + 48 + 60 = ₹243 lakh.
Q2.Using the same chart, in which month did revenue fall compared with the previous month?
Easy- AFebruary
- BMarch
- CApril
- DMay
Line Charts question 2 of 18+Show Answer & Explanation
Answer: C. April
Explanation: April fell to 48 from March's 50; every other month rose.
Q3.Using the same chart, the percentage increase from April to May is:
Moderate- A20%
- B25%
- C30%
- D33.3%
Line Charts question 3 of 18+Show Answer & Explanation
Answer: B. 25%
Explanation: (60 − 48)/48 × 100 = 25%.
Q4.Using the same chart, the average monthly revenue is:
Moderate- A₹46.6 lakh
- B₹48.6 lakh
- C₹50.2 lakh
- D₹52.4 lakh
Line Charts question 4 of 18+Show Answer & Explanation
Answer: B. ₹48.6 lakh
Explanation: 243/5 = ₹48.6 lakh.
Q5.Using the same chart, which month showed the largest absolute increase over the previous month?
Moderate- AFebruary
- BMarch
- CApril
- DMay
Line Charts question 5 of 18+Show Answer & Explanation
Answer: D. May
Explanation: Changes are +5, +5, −2 and +12 → May has the largest rise.
Q6.Using the same chart, March revenue as a percentage of the five-month total is approximately:
Moderate- A18%
- B21%
- C24%
- D27%
Line Charts question 6 of 18+Show Answer & Explanation
Answer: B. 21%
Explanation: 50/243 × 100 ≈ 20.6%.
Q7.In a line chart, a horizontal (flat) segment between two points indicates:
Easy- AA sharp rise
- BNo change in the quantity
- CA negative value
- DMissing data
Line Charts question 7 of 18+Show Answer & Explanation
Answer: B. No change in the quantity
Explanation: A flat line means the value stayed the same over that interval.
Q8.Two lines on a chart, Revenue and Cost, intersect in 2024. This means that in 2024:
Moderate- ARevenue was highest
- BCost was highest
- CRevenue equalled cost
- DProfit was highest
Line Charts question 8 of 18+Show Answer & Explanation
Answer: C. Revenue equalled cost
Explanation: An intersection marks the point where the two plotted quantities are equal — that is, break-even.
Q9.A chart shows profit rising from ₹20 lakh to ₹35 lakh over 5 years. The average annual increase is:
Moderate- A₹2 lakh
- B₹3 lakh
- C₹3.75 lakh
- D₹5 lakh
Line Charts question 9 of 18+Show Answer & Explanation
Answer: B. ₹3 lakh
Explanation: Total rise = ₹15 lakh over 5 years → ₹3 lakh per year on average.
Q10.If a line chart's y-axis begins at 40 rather than 0, the visual effect is that changes appear:
Difficult- ASmaller than they are
- BLarger than they are
- CUnchanged
- DNegative
Line Charts question 10 of 18+Show Answer & Explanation
Answer: B. Larger than they are
Explanation: Truncating the axis compresses the baseline, exaggerating the apparent slope of small changes.
Q11.A line chart shows temperature (°C): Mon 28, Tue 31, Wed 33, Thu 30, Fri 27. The highest temperature occurred on:
Easy- AMonday
- BTuesday
- CWednesday
- DThursday
Line Charts question 11 of 18+Show Answer & Explanation
Answer: C. Wednesday
Explanation: Wednesday peaked at 33 °C.
Q12.Using the temperature chart, the average temperature for the week was:
Moderate- A28.8 °C
- B29.8 °C
- C30.2 °C
- D31 °C
Line Charts question 12 of 18+Show Answer & Explanation
Answer: B. 29.8 °C
Explanation: (28 + 31 + 33 + 30 + 27)/5 = 149/5 = 29.8 °C.
Q13.Using the temperature chart, between which consecutive days was the largest RISE recorded?
Moderate- AMon to Tue
- BTue to Wed
- CWed to Thu
- DThu to Fri
Line Charts question 13 of 18+Show Answer & Explanation
Answer: A. Mon to Tue
Explanation: Monday to Tuesday rose 3 °C (28 → 31); Tuesday to Wednesday rose only 2 °C, and the remaining changes are falls.
Q14.A line chart shows website visitors (thousands): Jan 20, Feb 25, Mar 30, Apr 40. The growth from Jan to Apr is:
Moderate- A50%
- B75%
- C100%
- D120%
Line Charts question 14 of 18+Show Answer & Explanation
Answer: C. 100%
Explanation: (40 − 20)/20 × 100 = 100%.
Q15.Using the visitor chart, total visitors over the four months were:
Easy- A105,000
- B110,000
- C115,000
- D120,000
Line Charts question 15 of 18+Show Answer & Explanation
Answer: C. 115,000
Explanation: 20 + 25 + 30 + 40 = 115 thousand = 115,000 visitors.
Q16.Using the visitor chart, the largest month-on-month increase occurred in:
Moderate- AFebruary
- BMarch
- CApril
- DAll equal
Line Charts question 16 of 18+Show Answer & Explanation
Answer: C. April
Explanation: Increases are +5, +5 and +10 → April is largest.
Q17.On a line chart, a downward-sloping segment indicates that the quantity is:
Easy- ANegative
- BDecreasing
- CConstant
- DAt its maximum
Line Charts question 17 of 18+Show Answer & Explanation
Answer: B. Decreasing
Explanation: A falling line means the value is decreasing over that interval, though it may still be positive.
Q18.Line charts are most suitable for showing:
Easy- AParts of a whole
- BChange over time
- CExact category counts
- DGeographic data
Line Charts question 18 of 18+Show Answer & Explanation
Answer: B. Change over time
Explanation: Line charts plot a series against a continuous axis, usually time, making trends the natural reading.
Line Charts — Frequently Asked Questions
What does the intersection of two lines mean?+
That the two quantities are equal at that point in time. Questions frequently ask in which year one series overtook another, and the crossing point is the answer.
Why can a line chart be visually misleading?+
Because the y-axis often does not start at zero. A small change then looks dramatic, so always read the actual axis values rather than judging by the visual slope.
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