Part-I MCQs: the 20 compulsory multiple-choice questions of the CSS 2018 General Science & Ability paper, with answers and short explanations.

FPSC has not published these MCQs, so they are taken from published transcriptions, and the wording may differ slightly from the original paper. Answers are by the CSS Nexus team, and are correct as of the exam year.

Answers

1. Antibiotics are used to fight against: (C) Bacteria.

2. An astronomical unit or light year is used for: (A) Distance.

3. Radio waves broadcasted by radio broadcasting are reflected back by: (A) Ionosphere.

4. The use of antibiotics is a very effective way of killing disease-causing bacteria. Sometimes people don't finish all of their pills. This can result in: (D) Bacteria becoming resistant to antibiotics.

5. During combustion of petrol in a car engine, energy is converted into: (B) Mechanical. Chemical energy in the fuel becomes heat and then mechanical work.

6. Proteins are made up of: (B) Polypeptide.

7. A barometer is used for measuring: (C) Pressure.

8. The principle used in radar is the same as that of sonar. In radar, we use radio waves, whereas in sonar, we use: (C) Ultrasonic waves.

9. An ionic bond between two atoms is: (A) Complete transfer of valence electrons.

10. How is dengue fever transmitted? (D) Bite of an infected female Aedes mosquito.

11. The sky is blue because of: (A) Rayleigh scattering.

12. Cyclones: (D) Are associated with low-pressure systems.

13. Rainbow formation is due to: (D) Refraction and reflection of sunlight by water droplets.

14. The layer of the atmosphere in which the ozone layer lies is: (D) Stratosphere.

15. Which distance is bigger-an astronomical unit (AU) or a light-year (LY)? (D) A light-year (LY).

16. The rotation in which the Earth rotates is from: (A) West to east.

17. A collection of water droplets which are suspended in air is called: (B) Cloud.

18. How many calories should you eat per day to lose weight? (C) 1500 (unconfirmed).

19. The time interval to complete one rotation of the Earth around its own axis is: (C) 23 hours 56 minutes.

20. Enzymes in human bodies are: (A) Proteins.