Two identical plates P and Q, |HEAT TRANSFER|JEE MAIN 2025

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Two identical plates P and Q, radiating as perfect black bodies, are kept in vacuum at constant absolute temperatures $T_P$ and $T_Q$, respectively, with $T_Q

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QJEE Main 20262026

$\left(\frac{1}{3}+\frac{4}{7}\right)+\left(\frac{1}{3^2}+\frac{1}{3} \times \frac{4}{7}+\frac{4^2}{7^2}\right)+\left(\frac{1}{3^3}+\frac{1}{3^2} \times \frac{4}{7}+\frac{1}{3} \times \frac{4^2}{7^2}+\frac{4^3}{7^3}\right)+\ldots$ upto infinite terms, is equal to

JEE AdvanceMathematicsEasy

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QJEE Main 20262026

Let $P=\left[p_{i j}\right]$ and $Q=\left[q_{i j}\right]$ be two square matrices of order 3 such that $q_{\mathrm{ij}}=2^{(\mathrm{i}+\mathrm{j}-1)} \mathrm{p}_{\mathrm{ij}}$ and $\operatorname{det}(Q)=2^{10}$. Then...

JEE AdvanceMathematicsEasy

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QJEE Main 20262026

Let the image of parabola $x^2=4 y$, in the line $x-y=1$ be $(y+a)^2=b(x-c), a, b, c \in \mathrm{~N}$. Then $a+b+c$...

JEE MainMathematicsEasy

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QJEE Main 20262026

Let $a_1, a_2, a_3, a_4$ be an A.P. of four terms such that each term of the A.P. and its...

JEE MainMathematicsEasy

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QJEE Main 20262026

Let $\vec{a}=2 \hat{\mathrm{i}}-\hat{\mathrm{j}}-\hat{\mathrm{k}}, \vec{b}=\hat{\mathrm{i}}+3 \hat{\mathrm{j}}-\hat{\mathrm{k}}$ and $\vec{c}=2 \hat{\mathrm{i}}+\hat{\mathrm{j}}+3 \hat{\mathrm{k}}$. Let $\vec{v}$ be the vector in the plane of the vectors...

JEE MainMathematicsEasy

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QJEE Main 20262026

Let the angles made with the positive $x$-axis by two straight lines drawn from the point $\mathrm{P}(2,3)$ and meeting the...

JEE MainMathematicsEasy

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QJEE Main 20262026

Let the length of the latus rectum of an ellipse $\frac{x^2}{a^2}+\frac{y^2}{b^2}=1,(a>b)$, be 30 . If its eccentricity is the maximum...

JEE MainMathematicsEasy

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QJEE Main 20262026

Let $f(x)=\int \frac{7 x^{10}+9 x^8}{\left(1+x^2+2 x^9\right)^2} d x, x>0, \lim _{x \rightarrow 0} f(x)=0$ and $f(1)=\frac{1}{4}$.
If $...

JEE MainMathematicsMedium

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QJEE ADVANCE 20062006

Match the following:

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

According to Bohr's theory, $\mathrm{E}_{\mathrm{n}}=$ Total energy $\mathrm{K}_{\mathrm{n}}=$ Kinetic energy $\mathrm{V}_{\mathrm{n}}=$ Potential energy $\mathrm{r}_{\mathrm{n}}=$ Radius of $\mathrm{n}^{\text {th }}$ orbit...

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

Match the following:

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

Match the extraction processes listed in Column I with metals listed in Column II:

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

The edge length of unit cell of a metal having molecular weight $75 \mathrm{~g} / \mathrm{mol}$ is $5 \AA$ which...

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

We have taken a saturated solution of $\mathrm{AgBr} . \mathrm{K}_{\text {sp }}$ of AgBr is $12 \times 10^{-14}$. If $10^{-7}$...

JEE AdvanceChemistryEasy

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QJEE ADVANCE 2006 2006

For the reaction, $2 \mathrm{CO}+\mathrm{O}_2 \longrightarrow 2 \mathrm{CO}_2 ; \Delta \mathrm{H}=-560 \mathrm{~kJ}$. Two moles of CO and one mole of...

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

75.2 g of $\mathrm{C}_6 \mathrm{H}_5 \mathrm{OH}$ (phenol) is dissolved in a solvent of $\mathrm{K}_{\mathrm{f}}=14$. If the depression in freezing point...

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

Ammonia is always is added in this reaction. Which of the following must be incorrect?

JEE AdvanceChemistryEasy

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QJEE ADVANCE 20062006

When ammonia is added to the solution, pH is raised to 11 . Which half-cell reaction is affected by pH...

JEE AdvanceChemistryEasy

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