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PPSC MCQs

Punjab Public Service Commission — Complete MCQ Bank

86 Questions
Exam Preparation Guide

How to prepare for PPSC

PPSC examinations recruit candidates for Punjab government departments and commonly test general knowledge, current affairs, English and post-related subjects.

Punjab AffairsGeneral KnowledgeCurrent AffairsEnglish
Give special attention to Punjab geography, history and administration alongside the advertised post’s specialist syllabus.
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All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
21
Mathematics Medium

What is the geometric mean of 4 and 16?

  • A6
  • B8
  • C10
  • D12
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Correct Answer: Option B — 8
Explanation: Geometric mean = √(a×b) = √(4×16) = √64 = 8. Geometric mean is appropriate for data involving ratios or multiplicative growth unlike arithmetic mean for additive data. The geometric mean always lies between the arithmetic mean (10) and harmonic mean of the same two numbers.
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22
Mathematics Medium

The price after 20% discount is Rs 400. What was the original price?

  • ARs 480
  • BRs 500
  • CRs 520
  • DRs 540
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Correct Answer: Option B — Rs 500
Explanation: 0.8P = 400 → P = 500. Finding the original price before discount requires dividing by (1 - discount rate). Adding 20% to 400 gives the wrong answer. This is a common trap in competitive exams. Always divide by the remaining percentage fraction to find the original pre-discount price.
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23
Mathematics Medium

What is the sum of interior angles of a hexagon?

  • A540°
  • B720°
  • C900°
  • D1080°
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Correct Answer: Option B — 720°
Explanation: Sum of interior angles = (n-2)×180°. For hexagon n=6: (6-2)×180° = 4×180° = 720°. This formula applies to all convex polygons. Each interior angle of a regular hexagon = 720°/6 = 120°. Polygon angle formulas are standard geometry topics in competitive exams at all levels.
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24
Mathematics Medium

If the radius of a circle is doubled what happens to its area?

  • ADoubles
  • BTriples
  • CQuadruples
  • DRemains same
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Correct Answer: Option C — Quadruples
Explanation: Area = πr². If radius becomes 2r: new area = π(2r)² = 4πr² which is 4 times the original. When linear dimensions scale by factor k areas scale by k² and volumes by k³. This scaling relationship is tested in geometry problems involving similar figures and scale models in competitive exams.
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25
Mathematics Medium

A sum doubles itself in 8 years at simple interest. What is the rate?

  • A10%
  • B12.5%
  • C15%
  • D20%
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Correct Answer: Option B — 12.5%
Explanation: If principal = P then SI = P (since it doubles). SI = P×R×8/100 → P = P×R×8/100 → R = 100/8 = 12.5%. When money doubles at simple interest Rate = 100/Time. This relationship is a frequently tested shortcut in competitive exam problems about doubling or tripling periods.
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26
Mathematics Medium

Find the roots of x² - 5x + 6 = 0

  • Ax=1 and x=6
  • Bx=2 and x=3
  • Cx=3 and x=4
  • Dx=2 and x=4
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Correct Answer: Option B — x=2 and x=3
Explanation: Factoring: find two numbers multiplying to 6 and adding to -5 which are -2 and -3. So (x-2)(x-3) = 0 giving x=2 and x=3. Factoring is the fastest method when roots are rational integers. When factoring fails the quadratic formula provides a reliable universal method for finding roots.
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27
Mathematics Medium

A clock shows 3:00. What is the angle between the hour and minute hands?

  • A45°
  • B60°
  • C90°
  • D120°
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Correct Answer: Option C — 90°
Explanation: At 3:00 the minute hand is at 12 (0°) and the hour hand is at 3 (3×30°=90°). Angle = 90°. Each hour mark represents 30° and each minute represents 6°. Clock angle problems are popular in competitive aptitude tests requiring knowledge of how both hands move relative to each other.
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28
Mathematics Medium

If 2 to the power x equals 64 what is x?

  • A5
  • B6
  • C7
  • D8
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Correct Answer: Option B — 6
Explanation: 64 = 2⁶ so x = 6. When bases are equal the exponents must be equal. Recognizing powers of common bases (2 3 5 10) enables quick solutions. Such exponential equations appear in algebra sections of competitive exams requiring rapid mental identification of the correct power.
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29
Mathematics Medium

What is 30% of 40% of 500?

  • A50
  • B60
  • C70
  • D80
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Correct Answer: Option B — 60
Explanation: 40% of 500 = 200. 30% of 200 = 60. Successive percentages require applying one percentage to the result of another. This type appears in successive discount problems population growth and data interpretation. Never add the percentages directly as 70% of 500 gives the wrong answer of 350.
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30
Mathematics Medium

The average of 5 consecutive even numbers is 20. What is the largest number?

  • A22
  • B24
  • C26
  • D28
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Correct Answer: Option B — 24
Explanation: Consecutive even numbers: n n+2 n+4 n+6 n+8. Average = n+4 = 20 so n=16. Largest = 16+8 = 24. Consecutive number problems are common in competitive exams. Setting up the correct algebraic representation and using the average formula is the standard approach for solving such sequence problems efficiently.
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