CSS · Federal Public Service Commission · 2025
Solved CSS 2025 General Science & Ability one-liners — 19 MCQs with verified answers and explanations (vitamins, chemistry, physics, biology, earth science, maths). A booklet recall list for the GSA subject, not a full paper.
Paper Snapshot
Questions
19
Time
19
Minutes
Subjects
2
Topics
16
Read mode shows correct answers. Attempt mode hides answers, starts timer, and shows your result after submission.
About this paper
A 20-item General Science & Ability one-liner list from the Sir Adnan booklet headed 'CSS 2025 GSA' (monster-data 'CSS MPT PAST PAPERS' pack). 19 items are published here in the standard MCQ format with verified answers and explanations; the source prints answers only, so the 3 distractors per item are authored under Anas's 2026-10-28 single-format decision and optionsSource is recorded as 'authored'. One item was dropped as unanswerable as printed (printed Q12, which names chloroform as having the greater number of carbon atoms with no comparison set given, so no standard answer is identifiable). Printed Q20 carries a NOTE flag: the booklet's 60–300 km ionosphere range is the school-text figure, while modern definitions extend higher.
Paper Controls
Subject 1
Topic Section
2 solved MCQs shown directly below
Correct Answer: Vitamin A and Vitamin D
Fish liver oil is a rich natural source of vitamins A and D, which is why it is traditionally given as a supplement.
Correct Answer: Vitamin C
Vitamin C is water-soluble and is stored only in small amounts, unlike the fat-soluble vitamins A and D, so it must be taken regularly in the diet.
Topic Section
1 solved MCQs shown directly below
Correct Answer: 21st March and 23rd September
At the equinoxes (around 20–21 March and 22–23 September) the Sun is directly over the equator, so day and night are nearly equal worldwide.
Topic Section
2 solved MCQs shown directly below
Correct Answer: KAl(SO4)2·12H2O
Potash alum is potassium aluminium sulphate dodecahydrate: KAl(SO4)2·12H2O.
Correct Answer: Denoted by D2O and contains deuterium
Heavy water is D2O: water in which the hydrogen atoms are the heavier isotope deuterium instead of ordinary hydrogen.
Topic Section
1 solved MCQs shown directly below
Correct Answer: 69 miles
One degree of longitude at the equator is about 111 kilometres, roughly 69 miles.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Amino acids
Proteins are polypeptide chains built from amino acids linked together.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Protons
Isotopes of an element have the same number of protons (and electrons) but different numbers of neutrons.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Limestone
Adding limestone (calcium carbonate) neutralises soil acidity and raises the soil pH; sulphur, by contrast, lowers pH.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Light year
A light year is the distance light travels in one vacuum year and is used for astronomical distances; decibel, ampere and hertz measure sound level, current and frequency.
Topic Section
2 solved MCQs shown directly below
Correct Answer: Refraction
Light changes speed and bends when it passes from water into air, so the submerged part of the pencil appears displaced.
Correct Answer: It has long wavelength and low frequency
Red light has the longest visible wavelength, so it is scattered least by air particles and remains visible from the greatest distance.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Non-absorption of oxygen
Fish gills extract dissolved oxygen from water; in air the gill filaments collapse and cannot absorb enough oxygen, so the fish suffocates.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Loses thinking, remembering, and reasoning
Dementia is a progressive decline in cognitive functions — thinking, memory and reasoning — severe enough to interfere with daily life.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Seismograph
A seismograph (seismometer) records ground motion during an earthquake; its magnitude is then expressed on the Richter or moment-magnitude scale.
Topic Section
1 solved MCQs shown directly below
Correct Answer: When warm, moist air rises upward over the ocean
Warm, moist air rising over warm ocean water, cooling and condensing, drives the low-pressure system that becomes a cyclone.
Topic Section
1 solved MCQs shown directly below
Correct Answer: From 60–300 km above the Earth's surface
School-text treatments of the ionosphere put its main ionised layers from about 60 km up to about 300 km above the Earth.
Subject 2
Topic Section
1 solved MCQs shown directly below
Correct Answer: 84
C(9,3) = 9! / (3! × 6!) = (9 × 8 × 7) / (3 × 2 × 1) = 84.
Topic Section
1 solved MCQs shown directly below
Correct Answer: Nine times
Area = πr², so tripling the radius multiplies the area by 3² = 9.
Source & verification
Built by GK360 from verified bank questions — every answer rechecked before publishing. Where the source printed no options, the answer options were prepared by GK360; the questions and correct answers are the verified originals.
Questions
No. This is a 20-item one-liner list from a Sir Adnan booklet headed 'CSS 2025 GSA'. It is labelled as a recall list in the title, slug and paperType, and it must not be quoted as a full paper or as a CSS MPT section.
19 of the 20 printed items are published. Printed Q12 was dropped under Anas's 2026-10-28 decision: it states chloroform has the greater number of carbon atoms but gives no comparison set, so no standard answer can be identified from the item as printed, and nothing was inferred.
Under Anas's 2026-10-28 single-format decision, the 3 distractors per item are authored by us so the list works in the standard MCQ format; the answers themselves are the booklet's verified standard answers, never authored. optionsSource is recorded as 'authored'.
Nutrition and vitamins, astronomy (equinoxes), combinations, chemistry (alum, atomic structure, soil pH, heavy water), geometry and circles, longitude, proteins, health (dementia), respiration, earthquakes, cyclones, light and refraction, and the atmosphere (ionosphere).
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