BPSC CCE Prelims
General Science Previous Year Questions (PYQs)
Solved Previous Year Questions (PYQs) for General Science in BPSC CCE Prelims in English & Hindi Medium.
Chapter Breakdown: Scroll →
Steam methane reforming technique is used to obtain
Detailed Explanation:
Steam Methane Reforming (SMR) reacts natural gas (methane) with high-temperature steam to produce hydrogen and carbon dioxide (CO₂) as a by-product.
Since the process emits CO₂ without carbon capture, the hydrogen produced is classified as Grey Hydrogen. Brown Hydrogen comes from coal gasification, while Green Hydrogen is produced via water electrolysis using renewable energy with zero emissions.
Standard electrode potential of three metals A, B and C are respectively 0.5 V, -3 V and -1.2 V. Reducing power of these metals would be
Detailed Explanation:
Reducing power is inversely related to standard electrode potential (E°) — the more negative the E°, the stronger the reducing agent.
Metal B (−3.0 V) has the most negative potential → highest reducing power. Metal C (−1.2 V) is moderately negative → intermediate reducing power. Metal A (+0.5 V) is positive → lowest reducing power. Order: B > C > A.
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".
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Sour taste of vinegar is due to
Detailed Explanation:
The sour taste of vinegar is due to acetic acid (CH₃COOH), which is produced by fermentation of ethanol.
Tartaric acid is found in tamarind and grapes, lactic acid in sour milk and curd, and citric acid in citrus fruits — none of these is the acid in vinegar.
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.
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
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.
Buds are typically found
Detailed Explanation:
Plants have two main types of buds: apical buds (terminal buds) located at the tip of branches that enable vertical growth, and axillary buds (lateral buds) located at the base of leaves in the leaf axil that develop into side branches or flowers.
Therefore, buds are found at both locations – at the tip of branches and at the base of leaves.
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.
The Ishihara test is related with
Detailed Explanation:
The Ishihara test is a widely used medical screening tool designed to detect colour vision deficiency, specifically red-green colour blindness.
It consists of plates with coloured dots that form numbers or patterns visible only to individuals with normal colour vision; those with red-green deficiency fail to identify the hidden figures, making it the standard diagnostic method for colour blindness.
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.
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.
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.
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).
In short circuit, the value of electric current in a time circuit:
Detailed Explanation:
Short circuit occurs when a path of nearly zero resistance forms in a circuit, bypassing the normal load.
According to Ohm's Law (I = V/R), when resistance R approaches zero, the current I increases dramatically to very high values, limited only by the internal resistance of the source.
This surge can cause overheating, fires, and equipment damage, which is why fuses and circuit breakers are used for protection.