Conservation of energy
Conservation of energy is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions across 4 exam years between 2016 and 2025. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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एक वस्तू निर्वात पोकळीतून गुरुत्वाकर्षण क्रिये अंतर्गत मुक्तपणे खाली पडत आहे. अश्या प्रकारच्या क्रियेमध्ये खालीलपैकी कोणत्या बाबी स्थिर राहतील ? A body is falling freely under the action of gravity alone in vacuum. Which of the following quantities remains constant during the fall ?
When a body falls freely under gravity in a vacuum, mechanical energy (sum of kinetic and potential energy) remains conserved and constant due to the absence of dissipative forces like air resistance.
दोन वस्तूंच्या अप्रत्यास्थ धडकेच्या दरम्यान खालीलपैकी कोणत्या बाबींचे संवर्धन होईल ? During inelastic collision between two bodies, which of the following quantities always remains conserved ?
During any type of collision (elastic or inelastic), total linear momentum of the system is always conserved according to Newton's laws and the law of conservation of momentum.
एका माणसाला 25 किलो वजनाची बॅग 5 मीटर उंचीवर नेण्यास 30 सेकंद लागतात, तर त्या माणसाने वापरलेली शक्ती किती ? A person carrying a bag of total mass 25 kg climbs upto a height 5 meters in 30 seconds. How much power the man needs to carry the bag ?
Power is work done per unit time. Work done = mgh = 25 * 9.8 (or 10) * 5. Power = Work / Time. Calculating gives approximately 40.8 W depending on g value.
खालीलपैकी कोणती भौतिक राशी टकरीच्या दरम्यान अक्षय राहते ? Which physical quantity conserved during collision ?
According to the Law of Conservation of Momentum, the total momentum of a system of colliding objects remains constant before and after the collision (in the absence of external forces).