100+ Free TN Police SI Practice Questions

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2026 Statistics

Key Facts: TN Police SI Exam

140

MCQ Questions

TNUSRB Exam Pattern

2.5 hours

Exam Duration

TNUSRB Syllabus

₹500

Exam Fee

TNUSRB SI Recruitment

40%

Tamil Qualifying Cutoff

TNUSRB Eligibility

35%

Main Exam Minimum Cutoff

TNUSRB Selection Criteria

10+2+3

Educational Requirement

TNUSRB Eligibility

The Tamil Nadu Police SI exam is a highly competitive recruitment test consisting of 140 MCQs across General Knowledge (80 questions) and a Psychology Test (60 questions). It has a 2.5-hour duration, a passing score of 25 marks (35%), and an application fee of ₹500. Candidates must also qualify in the Tamil Language Eligibility Test and physical fitness exams to secure a post.

Sample TN Police SI Practice Questions

Try these sample questions to test your TN Police SI exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which of Newton's laws of motion defines force and introduces the concept of inertia?

A.First Law of Motion

B.Second Law of Motion

C.Third Law of Motion

D.Law of Gravitation

Explanation: Newton's First Law of Motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. This law is also known as the Law of Inertia because it establishes that matter resists changes in its state of motion. It provides the qualitative definition of force as that agency which changes or tends to change the state of rest or uniform motion of a body.

2Which of the following gases is the primary constituent of biogas and natural gas?

A.Methane

B.Ethane

C.Propane

D.Carbon dioxide

Explanation: Methane (CH4) is the primary constituent of both biogas (usually about 50-75%) and natural gas (over 90%). It is a clean-burning hydrocarbon fuel produced naturally through the anaerobic decomposition of organic matter by methanogenic bacteria. It is highly flammable and is used widely for cooking, heating, and generating electricity.

3Which of the following deficiency diseases is caused due to the lack of Vitamin A in the human diet?

A.Scurvy

B.Rickets

C.Nyctalopia (Night Blindness)

D.Beriberi

Explanation: Vitamin A (retinol) is essential for maintaining healthy vision, skin, and immune function. Its deficiency leads to Nyctalopia (night blindness), where the eyes fail to adjust to dim light due to a lack of rhodopsin pigment in the rods of the retina. Prolonged deficiency can lead to xerophthalmia and permanent blindness.

4What is the pH value of pure water at room temperature (25 degrees Celsius)?

A.0

B.5.6

C.7.0

D.14.0

Explanation: Pure water is neutral at room temperature and has a pH of 7.0. The pH scale ranges from 0 to 14, where values below 7 are acidic, values above 7 are basic, and 7 represents neutral. In pure water, the concentration of hydrogen ions (H+) is exactly equal to the concentration of hydroxide ions (OH-), which is 10^-7 mol/L.

5Which part of the human brain is primarily responsible for maintaining posture, balance, and motor coordination?

A.Cerebrum

B.Cerebellum

C.Medulla Oblongata

D.Pons

Explanation: The cerebellum, located at the back of the brain below the cerebrum, is responsible for regulating posture, balance, and coordination of voluntary muscle movements. It receives sensory information from the inner ear, eyes, and muscles to fine-tune motor actions. Damage to the cerebellum results in loss of motor control, clumsy movements, and balance issues.

6What is the approximate escape velocity required for a body to break free from the Earth's gravitational pull?

A.8.0 km/s

B.11.2 km/s

C.42.1 km/s

D.9.8 m/s^2

Explanation: The escape velocity of Earth is approximately 11.2 km/s (or about 40,270 km/h). This is the minimum speed an object must reach without further propulsion to escape Earth's gravitational field and travel into space. The value is calculated using the formula v = sqrt(2GM/R), where G is the gravitational constant, M is Earth's mass, and R is Earth's radius.

7Which of the following metal combinations forms the alloy known as 'solder', which is commonly used in electronic circuits?

A.Copper and Zinc

B.Copper and Tin

C.Lead and Tin

D.Iron and Carbon

Explanation: Solder is an alloy traditionally made of Lead (Pb) and Tin (Sn), typically in a 60:40 or 50:50 ratio. It has a low melting point, which makes it ideal for joining electrical wires and components on circuit boards. Modern solders may use lead-free combinations (like tin-silver-copper) for environmental safety, but the classic definition is lead and tin.

8Which cell organelle is commonly referred to as the 'suicide bag' of the cell?

A.Ribosome

B.Lysosome

C.Mitochondrion

D.Golgi Apparatus

Explanation: Lysosomes are membrane-bound organelles that contain powerful hydrolytic digestive enzymes. They are called 'suicide bags' because if a cell is damaged or undergoes senescence, the lysosomes can burst, releasing their enzymes to digest the cell's own proteins and organelles in a process called autolysis. This plays a key role in programmed cell death and tissue remodeling.

9Why is a person with blood group O negative (O-) considered a universal red blood cell donor?

A.Their red blood cells contain both A and B antigens

B.Their red blood cells lack A, B, and Rh antigens

C.Their plasma contains no antibodies

D.Their red blood cells possess unique antigens that suppress recipient antibodies

Explanation: A person with blood group O negative has red blood cells that lack A, B, and Rh antigens. Because these major antigens are absent, their red blood cells can be transfused into recipients of any blood type without triggering an acute immune reaction or causing hemolysis. O negative blood is highly valuable in emergency situations when the patient's blood type is unknown.

10Which type of mirror is used by dentists to view magnified images of teeth and in car headlights to produce a powerful parallel beam of light?

A.Convex mirror

B.Concave mirror

C.Plane mirror

D.Bifocal mirror

Explanation: A concave mirror is curved inward. When an object is placed close to it (between the focus and pole), it forms an upright, magnified, and virtual image, which helps dentists see teeth clearly. In headlights, a light bulb is placed at the focal point of the concave reflector, causing the reflected light rays to emerge parallel, creating a powerful, focused beam.

About the TN Police SI Exam

The Tamil Nadu Police Sub-Inspector (SI) Recruitment Examination is conducted by the Tamil Nadu Uniformed Services Recruitment Board (TNUSRB) to select qualified candidates for the post of Sub-Inspector of Police (Taluk, AR, and TSP). The selection process is highly competitive and involves a Tamil Language Eligibility Test, a Main Written Examination, Physical Measurement Tests (PMT), Endurance Tests (ET), Physical Efficiency Tests (PET), and a Viva-Voce. The Main Written Exam consists of two sections: General Knowledge and a Psychology Test.

Assessment

140 multiple-choice questions (80 General Knowledge, 60 Psychology)

Time Limit

2.5 hours

Passing Score

25 marks (35%) out of 70

Exam Fee

₹500 (Tamil Nadu Uniformed Services Recruitment Board (TNUSRB))

TN Police SI Exam Content Outline

15%

General Science

Physics, Chemistry, Biology, Environmental Science, Diet & Nutrition, and key scientific laws at standard 10th-12th level.

15%

History and Culture

Indian history, culture, socio-cultural movements, the Indian Freedom Movement, and major milestones.

10%

Geography

Physical features of India and Tamil Nadu, climate, rainfall, soil types, agriculture, forests, and natural resources.

10%

Economics and Commerce

Indian economic structure, development plans, industrial growth, trade, monetary policy, and agricultural economics.

10%

Indian Polity

The Constitution of India, executive, legislature, judiciary, fundamental rights, directive principles, and local body systems.

10%

Current Affairs

National and international events, awards, sports, prominent books, science advancements, and government welfare schemes.

15%

Logical and Mental Ability

Logical reasoning, coding-decoding, blood relations, syllogisms, and spatial or mental agility scenarios.

15%

Numerical Analysis

Numerical aptitude, basic arithmetic, percentages, averages, ratio-proportion, profit-loss, interest, and data interpretation.

How to Pass the TN Police SI Exam

What You Need to Know

Passing score: 25 marks (35%) out of 70
Assessment: 140 multiple-choice questions (80 General Knowledge, 60 Psychology)
Time limit: 2.5 hours
Exam fee: ₹500

Keys to Passing

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

TN Police SI Study Tips from Top Performers

1Focus heavily on Samacheer Kalvi state board textbooks (standards 6th to 12th) for science and social science topics.

2Spend consistent time practicing logical analysis and numerical reasoning, as the Psychology section accounts for 43% of the Main Exam marks.

3Regularly read newspapers and follow standard current affairs digests focusing on major schemes, sports, science events, and award winners.

4Ensure regular physical training. The Endurance Test (1500m run for men / 400m run for women) is qualifying, but the Physical Efficiency Test offers valuable marks that affect final rankings.

5Practice previous years' TNUSRB SI papers to understand the depth and style of questions asked.

Frequently Asked Questions

What is the passing score for the TN Police SI Main Written Exam?

For open candidates, the passing score is 25 marks (35%) out of the total 70 marks in the Main Written Examination. For departmental candidates, it is 30 marks (35%) out of the total 85 marks. However, candidates must score much higher than the passing score to be shortlisted for the physical tests and final selection.

What are the components of the TNUSRB SI selection process?

The selection process consists of multiple stages: (1) Tamil Language Eligibility Test (qualifying), (2) Main Written Examination, (3) Physical Measurement Test (PMT) & Endurance Test (ET), (4) Physical Efficiency Test (PET), (5) Viva-Voce (Interview), and (6) Special Marks (for NCC, NSS, or Sports certificates).

Who is eligible to apply for the TN Police SI exam?

Candidates must hold a Bachelor's degree from a recognized university under a 10+2+3/4/5 or 10+3+2/3 pattern. The general age limit is 20 to 30 years as of the notification date, with relaxations for reserved categories (up to 32 years for BC/MBC, 35 years for SC/ST, and 47 years for departmental candidates).

Is the Tamil Language Eligibility Test mandatory?

Yes, the Tamil Language Eligibility Test is mandatory for all candidates. It consists of 100 objective-type questions and is qualifying in nature. Candidates must score a minimum of 40% (40 marks) in this paper for their Main Written Exam papers to be evaluated.

What is the application fee for the TN Police SI recruitment?

The application fee is ₹500 for candidates applying under the Open Quota or Departmental Quota. If a departmental candidate wishes to apply under both the Open and Departmental Quota, they must pay a total application fee of ₹1,000.

Is there any negative marking in the written examination?

No, there is no negative marking in either the Tamil Language Eligibility Test or the Main Written Examination. Candidates are encouraged to attempt all questions.

100+ Free TN Police SI Practice Questions

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