CBSE Class XI Physics Prep
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CBSE Class XI Physics Prep
Sample questions with model answers
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(a) State and prove the law of conservation of mechanical energy for a freely falling body. (b) A body of 2 kg drops from 10 m. Find KE and PE at a height of 4 m. (g = 10 m/s²)
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Total energy conserved; KE = 80 J, PE = 40 J.
The full exam-length answer is in the app.
(a) Derive the relation v = ω × r. (b) A flywheel rotating at 1200 rpm decelerates uniformly at 2 rad/s². Find the number of rotations before it stops.
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v = ωr; Rotations = 120.
The full exam-length answer is in the app.
(a) Distinguish between conservative and non-conservative forces with examples. (b) Show that work done by a conservative force around a closed loop is zero. (c) Find PE stored in a spring (k=800 N/m) compressed by 5 cm.
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Conservative forces: path-independent; W = 0; PE = 10 J.
The full exam-length answer is in the app.
(a) Derive expressions for Time of flight, Max height, and Horizontal range of a horizontal projectile. (b) An aircraft flying horizontally at 490 m high with 180 km/h drops a package. Find the horizontal distance where it lands.
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Derive formulas; Distance = 1800 m.
The full exam-length answer is in the app.
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