201860 marks18 questions
4 of its 18 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.
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Source: JEE (Advanced) 2018, Paper 2, Physics, published by JEE (Advanced). The official PDF
A particle of mass is initially at rest at the origin. It is subjected to a force and starts moving along the -axis. Its kinetic energy changes with time as / , where is a positive constant of appropriate dimensions. Which of the following statements is (are) true?
In a radioactive decay chain, Th nucleus decays to Pb nucleus. Let and be the number of and particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
In an experiment to measure the speed of sound by a resonating air column, a tuning fork of frequency 500 is used. The length of the air column is varied by changing the level of water in the resonance tube. Two successive resonances are heard at air columns of length 50.7 and 83.9. Which of the following statements is (are) true?
A ball is projected from the ground at an angle of 45° with the horizontal surface. It reaches a maximum height of 120 and returns to the ground. Upon hitting the ground for the first time, it loses half of its kinetic energy. Immediately after the bounce, the velocity of the ball makes an angle of 30° with the horizontal surface. The maximum height it reaches after the bounce, in , is ___________.