PPSC Past Papers & Solved MCQs

The correct answer is None of these (8.3 Minutes) because sunlight requires approximately 8 minutes and 20 seconds (or roughly 8.3 minutes) to cross the massive distance to Earth.

• Step 1 (Distance vs. Speed): The average distance from the Sun to the Earth is approximately 149.6 million kilometers. Light travels through the vacuum of space at a fixed speed of roughly 299,792 kilometers per second.
• Step 2 (Mathematical Calculation): Dividing the total distance by the speed of light yields a travel duration of roughly 500 seconds. Converting 500 seconds into minutes results in exactly 8 minutes and 20 seconds, which equals 8.3 minutes.
• Incorrect Options:
  • 8 Seconds is incorrect because light would only travel about 2.4 million kilometers in this tiny window, barely passing the orbit of our Moon.
  • 8 Minutes is incorrect on its own because it leaves out the remaining 20 seconds, making option 4 the more accurate structural answer choice.
  • 17 Seconds is incorrect because this duration is vastly insufficient for light to bridge interplanetary distances.

The correct answer is Astronomy because it is the formal branch of science dedicated to the study of stars, planets, and celestial objects throughout the universe.

• Step 1 (Scientific Method): Astronomy utilizes physics, chemistry, and mathematics to study the evolution, composition, motion, and structural lifecycles of stars and celestial systems.
• Incorrect Options:
  • Astrology is incorrect because it is a non-scientific system of belief that attempts to predict human behavior and earthly events based on the relative positions of celestial bodies.
  • Cosmography is incorrect because it focuses primarily on mapping the general features of the universe and the visible heavens, rather than analyzing the specific physical properties of stars.
  • None of these is incorrect because astronomy is the exact academic term for this science.

The correct answer is 25kg because national economic audits and agricultural data show that the average citizen in Pakistan consumes around 25 kilograms of sugar every year.

• Step 1 (Fact Check & Historical Average): Annual data provided by international organizations like the FAO (FAOSTAT) and the USDA confirm that Pakistan's per capita refined sugar consumption routinely hovers around the 25 kg to 26 kg mark. This rate is heavily driven by a strong local demand for sweet foods and tea (chai).
• Step 2 (Comparative Dynamics): At an average consumption baseline of 25 kg per person, Pakistan sets one of the highest per capita rates in its region, outpacing neighboring nations like India and China by a significant margin.
• Incorrect Options:
  • 15kg is incorrect because it significantly underrepresents the actual heavy dietary intake of sweeteners within Pakistani household traditions.
  • 20kg is incorrect because it falls below the multi-year statistical trends tracked by national sugarcane and milling commissions.
  • None of these is incorrect because 25kg perfectly satisfies the documented baseline figures for competitive examinations.