BPSC CCE Prelims
Work, Power and Energy Previous Year Questions (PYQs)
Practice solved questions for Work, Power and Energy with detailed step-by-step solutions, key insights, and trend analysis for BPSC CCE PRELIMS.
Solved Previous Year Questions
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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.
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.
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Compared to a burn due to air at 100°C, the burn due to steam at 100°C is
Detailed Explanation:
Steam at 100°C contains latent heat of vaporization (540 cal/g) in addition to thermal energy, while air at 100°C has only thermal energy.
When steam condenses on skin, it releases this extra latent heat, transferring significantly more total energy than hot air, causing deeper and more severe burns.
An electron of mass M kg and charge e coulomb travels from rest through a potential difference of V volts. The final energy in joules would be
Detailed Explanation:
When a charged particle accelerates through a potential difference V, the work done by the electric field equals W = charge × voltage = eV joules.
Since the electron starts from rest, all this work converts into kinetic energy, making the final energy = eV joules. The mass M determines the final velocity but does not appear in the energy equation.
Which of the following energy changes involves frictional force?
Detailed Explanation:
✅ Option 1 – Correct: Kinetic energy to heat energy conversion involves frictional force. When objects move against each other (e.g., rubbing hands, braking vehicles), friction opposes motion and converts kinetic energy into heat energy.
❌ Option 2 – Incorrect: Potential energy to sound energy conversion (e.g., ringing bell, falling object hitting ground) does not require friction; it involves vibrations and mechanical energy transfer.
❌ Option 3 – Incorrect: Chemical energy to heat energy conversion (e.g., combustion, digestion) occurs through chemical reactions, not through frictional force.
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