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QJEE MAIN 2019
Charge is distributed within a sphere of radius $R$ with volume charge density $\rho(r)=\frac{A}{r^2} e^{\frac{-2 r}{a}}$, where $A$ and a are constants. If $Q$ is...
JEE MainPhysicsEasy
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QJEE MAIN 2019
If the standard electrode potential for a cell is 2 V at 300 K , the equilibrium constant $(\mathrm{K})$ for the reaction $\mathrm{Zn}(\mathrm{S})+\mathrm{Cu}^2(\mathrm{aq})$ 虽署 $\mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$...
JEE MainChemistryEasy
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QJEE MAIN 2019
The combination of plots which does not represent isothermal expansion of an ideal gas is
JEE MainChemistryMedium
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QJEE MAIN 2019
Two plane mirrors are inclined to each other such that a ray of light incident on the first mirror ( $\mathrm{M}_1$ ) and parallel to...
JEE MainPhysicsMedium
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QJEE-MAIN 2019
Let the moment of inertia of a hollow cylinder of length 30 cm (inner radius 10 cm and outer radius 20 cm), about its axis...
JEE MainPhysicsEasy
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QJEE MAIN 2019
The transition element that has lowest enthalpy of atomisation, is
JEE MainChemistryEasy
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QJEE MAIN 2019
The standard Gibbs energy for the given cell reaction in kJ mol–1 at 298 K is $\mathrm{Zn}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq}) \longrightarrow \mathrm{Zn}^{2+}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})$, $\mathrm{E}^{\circ}=2 \mathrm{~V}$ at 298...
JEE MainChemistryEasy
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QJEE MAIN 2019
The upper stratosphere consisting of the ozone layer protects us from the sun’s radiation that falls in the wavelength region of
JEE MainChemistryEasy
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QJEE MAIN 2019
A rod of mass ‘M’ and length ‘2L’ is suspended at its middle by a wire. It exhibits torsional oscillations; if two masses each of...
JEE MainPhysicsHard
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QJEE-MAIN 2019
A simple pendulum, made of a string of length $I$ and a bob of mass $m$, is released from a small angle $\theta 0$. It...
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