201580 marks20 questions
5 of its 20 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) 2015, Paper 2, Physics, published by JEE (Advanced). The official PDF
The energy of a system as a function of time t is given as E(t) = A² exp(−αt), where α = 0.2 s⁻¹. The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error in the value of E(t) at t = 5 s is
Four harmonic waves of equal frequencies and equal intensities I₀ have phase angles 0, π/3, 2π/3 and π. When they are superposed, the intensity of the resulting wave is nI₀. The value of n is
An electron in an excited state of Li²⁺ ion has angular momentum 3h/2π. The de Broglie wavelength of the electron in this state is pπa₀ (where a₀ is the Bohr radius). The value of p is
In terms of potential difference V, electric current I, permittivity ε₀, permeability μ₀ and speed of light c, the dimensionally correct equation(s) is(are)
A spherical body of radius R consists of a fluid of constant density and is in equilibrium under its own gravity. If P(r) is the pressure at r(r < R), then the correct option(s) is(are)