Preparing for the CSS General Science and Ability (GSA) paper? You’ve come to the right place! This paper is often considered a scoring section, and mastering it is crucial for your CSS exam success in 2025. To help you prepare effectively, we’ve provided a fully solved CSS GSA past paper with detailed, easy-to-understand explanations for each Multiple Choice Question (MCQ). Let’s get started and boost your preparation!
For CSS General Science and Ability (GSA) paper 2025 visit HERE
‘Blue dwarfs’ and ‘Red giants’ respectively refer to:
Old star and Young star
Moons of Jupiter
Young star and Old star
None of these
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Explanation: Red giants are stars in a late stage of stellar evolution, having exhausted the hydrogen fuel in their cores and expanded greatly. Blue dwarfs are theoretical stars predicted to evolve from red dwarfs after they have exhausted most of their hydrogen; they are hotter and denser than red dwarfs, hence “blue” and “dwarf”. While Young star and Old star is closer to a simplified general knowledge, Old star and Young star more accurately reflects the evolutionary sequence if we consider “young” as a later stage from red dwarfs. For a GSA paper intended for general knowledge, is likely the intended answer, despite astrophysical nuances.
Most major Tsunamis are produced by earthquakes with hypocenters less than:
40 km
30 km
50 km
None of these
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Explanation: Major Tsunamis are typically generated by shallow underwater earthquakes, specifically those with hypocenters (the point of origin within the Earth) less than 70 km deep, and more typically less than 40 km deep. Shallower earthquakes are more likely to displace the seabed significantly, generating large tsunami waves. 40 km falls within this critical depth range and is the most appropriate answer among the choices provided.
Which of the following source of energy is caused by uneven heating of earth’s surface?
Wind
Solar
Biomass
None of these
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Explanation: Wind is directly caused by the uneven heating of the Earth’s surface by the Sun. This uneven heating creates temperature differences, which in turn lead to pressure differences in the atmosphere. Air moves from areas of high pressure to areas of low pressure, creating wind. Solar energy is the source of the heating, but wind is the result of the uneven heating.
Global winds towards western direction are known as:
Trade winds
Western winds
Reynolds wind
None of these
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Explanation: Trade winds are global winds that blow towards the west in the tropics, specifically towards the equator. In the Northern Hemisphere, they blow from the northeast (northeast trade winds), and in the Southern Hemisphere, they blow from the southeast (southeast trade winds).
Perinatal transmission is said to occur when a pathogen is transmitted from:
Mother to infant
Non-human to human
Infected to uninfected
None of these
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Explanation: Perinatal transmission refers to the transmission of a pathogen from a mother to her infant around the time of birth. This can occur during pregnancy (across the placenta), during labor and delivery, or through breastfeeding.
Which of the plant group needs both land and water to complete their life cycle?
Bryophyta
Tracheophyta
Thallophyta
None of these
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Explanation: Bryophytes (mosses, liverworts, hornworts) are plant groups that require both land and water to complete their life cycle. They are terrestrial plants, but their sperm needs water to swim to the egg for fertilization.
Maximum amount of carbohydrates are obtained from:
Whole grain food
Nuts
Plant oil
None of these
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Explanation: Whole grain foods (like brown rice, whole wheat bread, oats, quinoa) are excellent sources of complex carbohydrates, which are a primary source of energy in the human diet.
Which of the following class has the largest numbers?
Insects
Fishes
Mammals
None of these
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Explanation: Insects (Class Insecta) are by far the most diverse and numerous class of animals on Earth. There are estimated to be millions of species of insects, far exceeding the numbers of fishes or mammals.
The process of preserving meat by stewing in a covered earthenware jug is called:
Jugging
Burial
Curing
None of these
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Explanation: Jugging is a method of cooking and preserving meat (especially game) by stewing it in a tightly covered earthenware jug or pot, often in a water bath. This slow cooking process tenderizes the meat and can aid in preservation.
All operating systems get their total memory initialized from:
BIOS
RAM
ROM
CPU
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Explanation: All operating systems, during the boot process, have their total memory initialized by the BIOS (Basic Input/Output System). The BIOS is firmware that is the first code run by a computer when powered on and initializes hardware including RAM.
The amount of data transmitted for a given amount of time is called:
Bandwidth
Noise
Frequency
None of these
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Explanation: Bandwidth is defined as the amount of data that can be transmitted over a network connection in a given amount of time, typically measured in bits per second (bps), kilobits per second (kbps), megabits per second (Mbps), etc.
Which of the following products can be prepared using raw guava?
Both (A) and (B)
Jam
Jelly
None of these
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Explanation: Raw guava can be used to prepare both Jam and Jelly. Guava jam is made by cooking guava pulp with sugar. Guava jelly is made from guava juice and sugar, resulting in a clearer, firmer product than jam.
Which of the following is used as a stabilizer in ice cream?
Gelatin
Sugar
Milk
None of these
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Explanation: Gelatin is commonly used as a stabilizer in ice cream. Stabilizers help to improve ice cream texture, prevent ice crystal formation, and improve melt resistance.
In the structure of fiber, the light is guided through the core due to total internal:
Reflection
Refraction
Diffraction
None of these
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Explanation: In optical fibers, light is guided through the core due to total internal reflection (TIR). The core has a higher refractive index than the cladding, causing light to reflect back into the core.
Who is known as the inventor of Artificial Intelligence?
John McCarthy
Charles Babbage
Alan Turing
None of these
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Explanation: John McCarthy is widely considered to be the “father of Artificial Intelligence” and is credited with coining the term “Artificial Intelligence” and organizing the Dartmouth Workshop, the founding event of AI as a field.
Which of the following is the common language for Artificial Intelligence?
Python
Java
Lisp
None of these
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Explanation: Python is currently the most common and widely used programming language for Artificial Intelligence (AI), especially in areas like Machine Learning and Deep Learning, due to its ease of use and extensive libraries.
Cement factory labourer are prone to:
Cytosilicosis
Leukemia
Bone marrow
None of these
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Explanation: Cytosilicosis (Silicosis or Pneumoconiosis) is a lung disease caused by the inhalation of silica dust, heavily present in cement dust. Cement factory laborers are at high risk of developing this occupational disease.
The fastest enzyme is:
Carbonic anhydrase
Pepsin
DNA polymerase
None of these
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Explanation: Carbonic anhydrase is considered one of the fastest enzymes, catalyzing the reversible hydration of carbon dioxide (CO2 + H2O ⇌ H2CO3) with an extremely high turnover rate, crucial for respiration and pH regulation.
Process of adding vitamins to milk is known as:
Fortification
Flavoring
Fermentation
None of these
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Explanation: Fortification is the process of adding vitamins and minerals to food products like milk to increase their nutritional value and enhance micronutrient levels.
The waves which are used for line of sight (LOS) communication are called:
Space waves
Cable waves
Antenna waves
None of these
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Explanation: Space waves (tropospheric waves or direct waves) are radio waves used for line-of-sight (LOS) communication, traveling directly from transmitter to receiver, suitable for applications like TV and FM radio broadcasting.
This fully solved CSS General Science and Ability (GSA) paper is a valuable resource for your 2025 exam preparation. Make sure to practice these MCQs and understand the explanations thoroughly to strengthen your grasp of the syllabus. Keep studying hard, and success in your CSS exams will be within your reach!
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