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Data interpretation PYQs for GATE CS

GATE CS Data interpretation: 2 chapters, 5 previous year questions (15% of Quantitative Aptitude), 79 practice questions and one solved question from each cha

A question from this chapter

Question 1

2025 Slot Set2 PYQ

Level 3: Exam Standard

Which one of the following options is correct for the given data in the table? Iteration (i) 0123 Input (I) 20 -4 1015 Output (X) 20162641 Output (Y) 20 -80 -800 -12000

Question 2

2024 Slot Set2 PYQ

Level 3: Exam Standard

The pie charts depict the shares of various power generation technologies in the total electricity generation of a country for the years 2007 and 2023. Year 2007 Year 2023 Coal 35% Gas 25% Hydro 30% Solar 5% Wind 5% Coal 20% Gas 15% Hydro 35% Solar 20% Wind 10% The renewable sources of electricity generation consist of Hydro, Solar and Wind. Assuming that the total electricity generated remains the same from 2007 to 2023, what is the percentage increase in the share of the renewable sources of electricity generation over this period?

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Data interpretation PYQs for GATE CS

GATE CS Data interpretation: 2 chapters, 5 previous year questions (15% of Quantitative Aptitude), 79 practice questions and one solved question from each chapter.

About Data interpretation Previous Year Questions (PYQs)

5 previous year questions from Data interpretation in GATE CS, grouped by chapter with the exam year, answer key and step-by-step solution for each.

Data interpretation Weightage in GATE CS

Data interpretation accounts for 5 of 33 Quantitative Aptitude previous year questions in our bank (15%), about 1 per paper across 5 papers.

Data interpretation Chapter Matrix

Chapter	Topics	PYQs	Share of unit PYQs	Practice questions
Tables and Structured Data	Commercial Tables and Percentage Calculations, Recurrence Patterns in Tabular Data	2	40%	32
Charts and Graphical Data Interpretation	Pie Chart Interpretation and Percentage Change, Bar Charts and Ratio Comparison	3	60%	47

One Solved Question from Each Data interpretation Chapter

Question 1 · Tables and Structured Data · 2025_Set2 MCQ

Which one of the following options is correct for the given data in the table?

i

)0123Input (

I

)20−41015Output (

X

)20162641Output (

Y

)20−80−800−12000

A.
$X (i) = X (i - 1) + I (i); Y (i) = Y (i - 1) I (i); i > 0$
B.
$X (i) = X (i - 1) I (i); Y (i) = Y (i - 1) + I (i); i > 0$
C.
$X (i) = X (i - 1) I (i); Y (i) = Y (i - 1) I (i); i > 0$
D.
$X (i) = X (i - 1) + I (i); Y (i) = Y (i - 1) I (i - 1); i > 0$

Correct Answer:

Step-by-Step Solution

Insight: Test the given recurrence relations step-by-step for $i = 1$ and $i = 2$ using the table values to eliminate incorrect options.

Exam route: For $i = 1$ , $X (1) = X (0) + I (1) = 20 + (- 4) = 16$ . $Y (1) = Y (0) \times I (1) = 20 \times (- 4) = - 80$ . This matches Option A. Verify for $i = 2$ : $X (2) = 16 + 10 = 26$ , $Y (2) = - 80 \times 10 = - 800$ . Matches perfectly.

Learning route:

Observe the table: We have sequences for Input $I$ , Output $X$ , and Output $Y$ over iterations $i = 0, 1, 2, 3$ .
Test Option A for $i = 1$ :

$X (1) = 20 + (- 4) = 16$ . (Matches table)

$Y (1) = 20 \times (- 4) = - 80$ . (Matches table)

Test Option A for $i = 2$ :

$X (2) = 16 + 10 = 26$ . (Matches table)

$Y (2) = - 80 \times 10 = - 800$ . (Matches table)

Test Option A for $i = 3$ :

$X (3) = 26 + 15 = 41$ . (Matches table)

$Y (3) = - 800 \times 15 = - 12000$ . (Matches table)

Conclusion: Option A is the only recurrence relation that consistently reproduces the table's values.

Question 2 · Charts and Graphical Data Interpretation · 2024_Set2 MCQ

The pie charts depict the shares of various power generation technologies in the total electricity generation of a country for the years 2007 and 2023.

The renewable sources of electricity generation consist of Hydro, Solar and Wind. Assuming that the total electricity generated remains the same from 2007 to 2023, what is the percentage increase in the share of the renewable sources of electricity generation over this period?

A.
25%
B.
50%
C.
77.5%
D.
62.5%

Correct Answer:

Step-by-Step Solution

Insight: Since total electricity generated remains constant across both years, percentage shares can be used directly in the percentage change formula without converting to absolute values.

Exam route: Sum the renewable percentages for each year, then apply (new − old)/old × 100.

Learning route:

Step 1: Identify renewable sources from the question statement: Hydro, Solar, and Wind.

Step 2: Sum renewable share for 2007 from the pie chart: Hydro 30% + Solar 5% + Wind 5% = 40%.

Step 3: Sum renewable share for 2023 from the pie chart: Hydro 35% + Solar 20% + Wind 10% = 65%.

Step 4: Since total generation is constant, the percentage increase in share equals the percentage increase in actual generation. The old value is the anchor denominator.

Step 5: Apply the percentage change formula:

$Percentage Change = (\frac{65 - 40}{40}) \times 100 = \frac{25}{40} \times 100 = 62.5%$

Verification: If total generation = 100 units, renewables went from 40 to 65 units. $(65 - 40) /40 = 0.625 = 62.5%$ . ✓

A question from this chapter

Login to view the complete previous-year questions and solutions

Personalised first. High quality throughout.

Built around you, not around a syllabus PDF

Revision that hits your weak spots

Questions calibrated to the real exam

Notes written for recall, not for volume

One place for everything

Honest progress

Unlock the whole course

Data interpretation PYQs for GATE CS

About Data interpretation Previous Year Questions (PYQs)

Data interpretation Weightage in GATE CS

Data interpretation Chapter Matrix

More from Quantitative Aptitude

One Solved Question from Each Data interpretation Chapter

Step-by-Step Solution

Step-by-Step Solution