CSS Compulsory Past Papers MCQs

**The radioactive isotope of uranium used in a nuclear bomb is:**A) 92U235B) 92U234C) 92U233D) None of these Show Answer Correct Answer: A – 92U235

**Human population growth is greatest in developing countries because:**A) The birth rate is high in developing countriesB) The death rate is high in developing countriesC) Much of the population has already reached pubertyD) None of these Show Answer Correct Answer: A – The birth rate is high in developing countries

**Which woody raw material is used for the manufacture of paper pulp?**A) CottonB) PoplarC) Rice strawD) None of these Show Answer Correct Answer: B – Poplar

**Rectified spirit contains alcohol about:**A) 80%B) 95%C) 70%D) None of these Show Answer Correct Answer: B – 95%

**Which of the following elements is not present abundantly in Earth’s crust?**A) SiliconB) RadiumC) CarbonD) None of these Show Answer Correct Answer: B – Radium

**The famous book Al-Qanoon was written by the Muslim scientist:**A) Jabir Ibn HayyanB) Zakariya Al-RaziC) Abu Ali SinaD) None of these Show Answer Correct Answer: C – Abu Ali Sina

**Basic metals can be converted into gold by:**A) HeatingB) BeatingC) Artificial nuclear radioactivityD) None of these Show Answer Correct Answer: C – Artificial nuclear radioactivity

**A light year is a unit of:**A) TimeB) EnergyC) LengthD) None of these Show Answer Correct Answer: C – Length

**One of the main functions of the Earth’s ozone layer is to:**A) Prevent global warmingB) Filter out ultraviolet raysC) Absorb pollutionD) None of these Show Answer Correct Answer: B – Filter out ultraviolet rays

**Select the correct association:**A) Oxidation – loss of an electronB) Oxidation – gain of an electronC) Reduction – gain of a neutronD) None of these Show Answer Correct Answer: A – Oxidation – loss of an electron