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QJEE-MAIN 2020
A driver in a car, approaching a vertical wall notices that the frequency of his car horn, has changed from 440 Hz to 480 Hz,...
JEE MainPhysicsEasy
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QJEE MAIN 2020
Let $\alpha$ and $\beta$ be the roots of $x^2-3 x+p=0$ and $\gamma$ and $\delta$ be the roots of $x^2-6 x+q=0$. If $\alpha, \beta, \gamma, \delta$...
JEE MainMathematicsMedium
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QJEE MAIN 2020
The plot that depicts the behavior of the mean free time $\tau$ (time between two successive collisions) for the molecules of an ideal gas, as...
JEE MainPhysicsMedium
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QJEE MAIN 2020
If the perpendicular bisector of the line segment joining the points P(1, 4) and Q(k, 3) has y-intercept equal to –4, then a value of...
JEE MainMathematicsEasy
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QJEE MAIN 2020
Let $f$ and $g$ be differentiabel functions on $R$ such that fog is the identity function. If for some $\mathrm{a}, \mathrm{b} \in \mathrm{R}$, $\mathrm{g}^{\prime}(\mathrm{a})=5$ and...
JEE MainMathematicsEasy
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QJEE-MAIN 2020
Two different wires having lengths $L_1$ and $L_2$, and respective temperature coefficient of linear expansion $\alpha_1$ and $\alpha_2$, are joined end-to-end. Then the effective temperature...
JEE MainPhysicsEasy
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QJEE MAIN 2020
Consider two solid spheres of radii $R_1=1 m, R_2=2 m$ and masses $M_1$ and $M_2$, respectively. The gravitational field due to sphere (1) and (2)...
JEE MainPhysicsEasy
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QJEE-MAIN 2020
Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in the circuit below. The...
JEE MainPhysicsEasy
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QJEE MAIN 2020
A 20.0 mL solution containing 0.2 g impure $\mathrm{H}_2 \mathrm{O}_2$ reacts completely with 0.316 g of $\mathrm{KMnO}_4$ in acid solution. The purity of $\mathrm{H}_2 \mathrm{O}_2$...
JEE MainChemistryMedium
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QJEE MAIN 2020
A thermodynamic cycle xyzx is shown on a V-T diagram The P-V diagram that best...
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The P-V diagram that best... 