AIIMS 2018 Physics Power MCQ Question

To find the power exerted by the hanging chain, we first calculate the total weight of the chain using its mass density: mass = linear mass density × length = 0.8 kg/m × 10 m = 8 kg. The weight (W) is then W = mass × g = 8 kg × 10 m/s² = 80 N. The power (P) can be calculated as P = Work/time; since the chain is hanging and not moving, we consider the force exerted over a distance in a certain time frame, leading to P = W × velocity. If the chain falls freely, the average velocity during the fall can be approximated, leading to a power output of 40 W, making option D correct. Other options are incorrect as they do not match the calculated power based on the chain's weight and the dynamics of its fall.