71st BPSC Prelims 2025
General Science Previous Year Questions (PYQs)
Explore 29 solved 71st BPSC Prelims 2025 General Science questions with detailed step-by-step bilingual solutions, option analysis, and answer keys.
Which term in the following does not denote the electric power în electric circuit?
Detailed Explanation:
Electric power in a circuit is given by P = VI (voltage × current).
Using Ohm's law (V = IR), we can derive two more valid formulas:
• P = I²R (substituting V = IR into P = VI)
• P = V²/R (substituting I = V/R into P = VI)
✅ Option 2 (I²R): Valid power formula.
✅ Option 3 (VI): Fundamental definition of power.
✅ Option 4 (V²/R): Valid derived formula.
❌ Option 1 (IR²): Not a valid power formula. Its dimensional analysis gives (Ampere × Ohm²), which does not equal Watt (power unit).
The focal distance of a plane mirror is
Detailed Explanation:
Focal length of a mirror is f = R/2, where R is the radius of curvature.
A plane mirror has zero curvature (flat surface), so R = ∞. Therefore, f = ∞/2 = ∞. Parallel rays reflecting from a plane mirror remain parallel and never converge or diverge to form a focus point.
A pair of Oxen exerts a force of 140 newton while ploughing the field. The field ploughed is 15 meter long. The work done in ploughing the length of the field is:
Detailed Explanation:
Work done is calculated using the formula W = F × d, where F is force and d is distance.
Given Force = 140 N and Distance = 15 m, substituting values: W = 140 × 15 = 2100 Joule.
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The potential energy of a freely falling body continuously decreases.
Detailed Explanation:
Potential energy (PE) decreases as height decreases during free fall, while kinetic energy (KE) increases due to increasing velocity.
Total mechanical energy (PE + KE) remains constant throughout the fall, demonstrating that the law of conservation of energy is not violated—energy transforms from one form to another but is neither created nor destroyed.
In which medium, the speed of sound is maximum?
Detailed Explanation:
Speed of sound depends on elasticity and density of the medium — highest in solids, moderate in liquids, lowest in gases.
Steel (solid) ≈ 5000–6000 m/s, Water (liquid) ≈ 1500 m/s, Air (gas) ≈ 343 m/s, Hydrogen (gas) ≈ 1284 m/s. Among given options, steel has maximum speed.
Energy consumed in a home is 250 units then the total energy in Joule will be:
Detailed Explanation:
1 unit of electrical energy = 1 kWh = 3.6 × 10⁶ joules.
250 units = 250 × 3.6 × 10⁶ J = 900 × 10⁶ J = 9 × 10⁸ J.
A truck starts from rest down a hill with a constant acceleration. It achieves 400 meters in 20 seconds. If the weight of the truck is 7 tons then what will be the force acting on it?
Detailed Explanation:
Given: Initial velocity u = 0 (starts from rest), displacement s = 400 m, time t = 20 s, mass m = 7 tons = 7000 kg.
Step 1 – Find acceleration: Using s = ut + ½at²
400 = 0 + ½ × a × (20)²
400 = 200a
a = 2 m/s²
Step 2 – Calculate force: Using F = ma
F = 7000 × 2
F = 14000 N
Answer: 14000 Newtons
We apply a force of 200 Newtons on a wooden Box and push it on the floor at constant velocity. The marginal friction force will be:
Detailed Explanation:
Constant velocity means net force = 0, so applied force equals friction force.
Applied force = 200 N, therefore kinetic friction = 200 N.
Kanha National Park is established in -
Detailed Explanation:
Kanha National Park is located in Mandla and Balaghat districts of Madhya Pradesh.
Established as a wildlife sanctuary in 1955 and declared a national park in 1955, it became a Project Tiger reserve in 1973. Famous for Royal Bengal Tigers and barasingha (swamp deer), the park inspired Rudyard Kipling's "The Jungle Book".
Showing 21 to 29 of 29 questions
71st BPSC Prelims 2025 - General Science Chapter-wise Distribution
Physics
11 Qs (37.9%)Biology
10 Qs (34.5%)Chemistry
4 Qs (13.8%)Environmental Science
1 Qs (3.4%)Science and Technology Developments
1 Qs (3.4%)Biotechnology
1 Qs (3.4%)Human Health and Diseases
1 Qs (3.4%)71st BPSC Prelims 2025 - General Science Questions FAQs
Q1 How many General Science questions were asked in 71st BPSC Prelims 2025?
Q2 What is the chapter-wise question distribution for General Science in 71st BPSC Prelims 2025?
- Physics: 11 questions (37.9%)
- Biology: 10 questions (34.5%)
- Chemistry: 4 questions (13.8%)
- Environmental Science: 1 questions (3.4%)
- Science and Technology Developments: 1 questions (3.4%)
- Biotechnology: 1 questions (3.4%)
- Human Health and Diseases: 1 questions (3.4%)