100+ Free BCS Written General Science & Tech Practice Questions

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BCS Written Compulsory: Mathematical Reasoning & Mental Ability (BPSC, Bangladesh)

Practice Questions100 questions

2026 Statistics

Key Facts: BCS Written General Science & Tech Exam

100

Total Marks

BPSC Syllabus

3 hours

Exam Duration

BPSC Syllabus

Merit-based

Qualifying Standard

BPSC Regulations

Viva Voce

Next Stage After Written

BPSC Regulations

119.1 E

Bangabandhu Satellite-1 Position

BTRC, Bangladesh

2041

Smart Bangladesh Target Year

ICT Division of Bangladesh

The BCS Written General Science & Technology paper is a compulsory 100-mark, 3-hour descriptive exam administered by BPSC. It tests General Science (Physics, Chemistry, Biology, Environmental science), Computer & Information Technology, and Electrical & Electronic Technology. Candidates must meet BPSC minimum qualifying standards and an overall merit threshold to advance to Viva Voce. This free prep bank provides 100 structured MCQs aligned with these BPSC syllabus topics.

Sample BCS Written General Science & Tech Practice Questions

Try these sample questions to test your BCS Written General Science & Tech exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of the following physical phenomena is primarily responsible for the separation of white light into its constituent colors when passing through a glass prism?

A.Refraction

B.Dispersion

C.Total internal reflection

D.Diffraction

Explanation: Dispersion is the phenomenon where white light splits into its component colors when passing through a medium due to different wavelengths refracting at slightly different angles. While refraction is the bending of light, the separation itself is dispersion.

2Which optical phenomenon explains the formation of a mirage in hot deserts?

A.Interference of light

B.Total internal reflection

C.Polarization of light

D.Double refraction

Explanation: A mirage is an optical illusion caused by the bending of light rays (refraction) through layers of air of different temperatures, culminating in total internal reflection when light travels from denser to rarer air layers close to the hot ground.

3What is the primary characteristic of LASER light that distinguishes it from ordinary light?

A.It contains light of all visible wavelengths.

B.It is highly coherent and monochromatic.

C.It travels slower through vacuum.

D.It cannot undergo diffraction.

Explanation: LASER (Light Amplification by Stimulated Emission of Radiation) produces light that is highly coherent (waves are in phase) and monochromatic (single specific wavelength/color), which allows it to form a narrow, intense beam.

4At what decibel (dB) level does sound generally become painful to the human ear?

A.50 dB

B.80 dB

C.120 dB

D.180 dB

Explanation: Sound levels at or above 120 dB represent the threshold of pain for the human ear and can cause immediate physical discomfort or temporary hearing damage. Normal conversation is around 60 dB, and prolonged exposure to levels above 85 dB can cause gradual hearing loss.

5What is the minimum distance required between the source of a sound and a reflecting surface to hear a distinct echo under standard atmospheric conditions?

A.1.7 meters

B.17.2 meters

C.34.4 meters

D.110 meters

Explanation: The human brain requires a time interval of at least 0.1 seconds to distinguish between the original sound and its reflection. Since the speed of sound in air is approximately 344 m/s at 20 degrees Celsius, the total distance traveled by the sound to go and return must be 344 * 0.1 = 34.4 meters. Hence, the minimum distance to the barrier is half of that, which is 17.2 meters.

6Which of the following actions will increase the strength of the magnetic field generated inside a current-carrying solenoid?

A.Decreasing the number of turns in the coil

B.Replacing the soft iron core with a wooden core

C.Increasing the electrical current flowing through the solenoid

D.Increasing the length of the solenoid while keeping the number of turns constant

Explanation: The magnetic field strength (B) of a solenoid is directly proportional to the current (I) and the number of turns per unit length (n). Thus, increasing the current increases the magnetic field strength. Using a soft iron core also concentrates the field, whereas wood would weaken it.

7What is the pH value of a completely neutral aqueous solution at 25 degrees Celsius?

A.0

B.5.6

C.7.0

D.14.0

Explanation: A pH of 7.0 indicates a neutral solution at 25°C, where the concentration of hydrogen ions (H+) equals the concentration of hydroxide ions (OH-). A pH lower than 7 is acidic, and a pH higher than 7 is basic (alkaline).

8Which organic acid is the primary constituent of commercial vinegar?

A.Citric acid

B.Acetic acid

C.Lactic acid

D.Formic acid

Explanation: Vinegar is an aqueous solution containing 4% to 8% acetic acid (CH3COOH) by volume. Acetic acid is produced through the fermentation of ethanol by acetic acid bacteria.

9Why is water commonly referred to as the 'universal solvent' in chemical sciences?

A.It has a very low surface tension.

B.It is a highly polar molecule with a high dielectric constant.

C.It exists in all three states of matter on Earth.

D.It reacts violently with all metals to form soluble oxides.

Explanation: Water is a polar molecule with a high dielectric constant (approx. 80), which means it can easily disrupt the electrostatic forces holding ionic compounds together, allowing them to dissolve. This polarity also enables it to form hydrogen bonds with other polar substances.

10The presence of which minerals is the primary cause of permanent hardness in water?

A.Calcium and magnesium bicarbonates

B.Sodium and potassium chlorides

C.Calcium and magnesium sulfates and chlorides

D.Iron and zinc carbonates

Explanation: Permanent hardness in water is caused by the presence of calcium and magnesium sulfates (CaSO4, MgSO4) or chlorides (CaCl2, MgCl2). Unlike temporary hardness (caused by bicarbonates), permanent hardness cannot be removed by boiling and requires chemical treatment or ion exchange.

About the BCS Written General Science & Tech Exam

The Written Compulsory General Science & Technology exam is a crucial 100-mark paper in the BCS written stage. It evaluates a candidate's grasp of general scientific principles, computer architectures, networking, telecommunications, and emerging technologies. High scores in this paper are vital for securing preferred cadre allocations like Admin, Foreign, or Police.

Assessment

The Written Compulsory General Science & Technology exam carries 100 marks with a duration of 3 hours. It features descriptive and short-answer questions. The syllabus is divided into General Science (Physics, Chemistry, Biology, Environmental science, Biotechnology), Computer & Information Technology, and Electrical & Electronic Technology.

Time Limit

3 hours

Passing Score

BPSC applies minimum qualifying standards for each compulsory written paper and an overall merit threshold across the written papers to qualify for Viva Voce; the specific thresholds are set by BPSC and are not published as fixed universal numbers.

Exam Fee

Tk 200 (general candidates; Tk 50 for quota categories) per BCS exam cycle (Bangladesh Public Service Commission (BPSC))

BCS Written General Science & Tech Exam Content Outline

60%

General Science (Physics, Chemistry, Biology, Environmental Science, Biotechnology)

Covers fundamental physics (light, sound, magnetism), chemistry (acids, bases, polymers, atmosphere), biology (nutrition, diseases, physiology), environmental science (pollution, climate change), and biotechnology.

25%

Computer & Information Technology

Covers computer organization, CPU, memory, storage devices, operating systems, number systems, logic gates, networking, protocols, telecommunications, and cybersecurity.

15%

Electrical & Electronic Technology

Covers electrical components, Ohm's and Kirchhoff's laws, electromagnetism, AC/DC generation, motors, transformers, digital devices, and radio/television/radar fundamentals.

How to Pass the BCS Written General Science & Tech Exam

What You Need to Know

Passing score: BPSC applies minimum qualifying standards for each compulsory written paper and an overall merit threshold across the written papers to qualify for Viva Voce; the specific thresholds are set by BPSC and are not published as fixed universal numbers.
Assessment: The Written Compulsory General Science & Technology exam carries 100 marks with a duration of 3 hours. It features descriptive and short-answer questions. The syllabus is divided into General Science (Physics, Chemistry, Biology, Environmental science, Biotechnology), Computer & Information Technology, and Electrical & Electronic Technology.
Time limit: 3 hours
Exam fee: Tk 200 (general candidates; Tk 50 for quota categories) per BCS exam cycle

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

BCS Written General Science & Tech Study Tips from Top Performers

1Understand the key difference between analog and digital networks, and the features of IPv4 vs IPv6.

2Support technology essays with updated data from the Bangabandhu Satellite-1, SEA-ME-WE submarine cables, and Smart Bangladesh pillars.

3Understand the fundamentals of logic gates and binary number systems, which often yield solid analytical marks.

4Memorize key chemical formulas (like rust, common polymers) and physiological details of the human body (like blood circulation, endocrine hormones).

Frequently Asked Questions

What is the marks distribution for the BCS Written General Science & Technology paper?

The General Science & Technology written paper is a compulsory subject carrying a total of 100 marks. It is conducted over a duration of 3 hours. The paper consists of three parts: Part A: General Science (60 marks), Part B: Computer and Information Technology (25 marks), and Part C: Electrical and Electronic Technology (15 marks).

What is the pass mark for the BCS written examination?

BPSC applies minimum qualifying standards for each compulsory written paper and an overall merit threshold across all compulsory written papers to qualify for the Viva Voce. The specific thresholds are set by BPSC for each cycle and are not published as fixed universal numbers; selection is merit-based and competitive.

What are the key topics in the BPSC General Science & Technology written syllabus?

The syllabus is divided into three core sections: (1) General Science: covers Light, Sound, Magnetism, Acid/Base/Salt, Water, Atmosphere, Food/Nutrition, Biotech, Diseases; (2) Computer and IT: covers hardware, software, number systems, networks, protocols, telecommunications, and cybersecurity; (3) Electrical & Electronic Technology: covers electrical components, Ohm's and Kirchhoff's laws, AC/DC generation, motors, transformers, digital devices, and radio/TV/radar.

How can I practice for this descriptive exam using this MCQ bank?

While the actual BCS exam is descriptive, this MCQ bank contains 100 questions that test detailed factual knowledge (dates, formulas, network concepts, telecommunications spectrum, emerging technology details). Using this bank helps you verify facts quickly, ensuring you don't make factual errors in your descriptive answers.