Class XI Physics Exam Prep
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Class XI Physics Exam Prep
Sample questions with model answers
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The distance of two planets from the sun are $10^{13}$ and $10^{12}$ m respectively. Find the ratio of time periods and speeds of the two planets.
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Ratio of time periods is $\sqrt{10}$ and speeds is $\sqrt{10}$.
The full exam-length answer is in the app.
A particle is projected upward from the surface of the earth (radius R) with a Kinetic Energy equal to half the minimum value needed for it to escape. To which height does it rise above the surface of the earth?
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Height is $\frac{R}{2}$.
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A block of mass 25 kg is raised by a 50 kg man in two different ways as shown below. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the block without the floor yielding?
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Use the pulley method to avoid yielding.
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A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of mass 2 kg which is suspended by a string of length 5 m. The centre of gravity of the block is found to rise a vertical distance of 0.1 m. What is the speed of the bullet after it emerges from the block? Take $g = 9.8 \text{ m/s}^2$.
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Use conservation of momentum and energy principles.
The full exam-length answer is in the app.
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