1
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Water flows in a horizontal pipe whose one end is closed with a valve. The reading of the pressure gauge attached to the pipe is $P_1$. The reading of the pressure gauge falls to $P_2$ when the valve is opened. The speed of water flowing in the pipe is proportional to
2
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
The energy of a system is given as $\mathrm{E}(\mathrm{t})=\alpha^3 \mathrm{e}^{-\beta t}$, where t is the time and $\beta=0.3 \mathrm{~s}^{-1}$. The errors in the measurement of $\alpha$ and $t$ are $1.2 \%$ and $1.6 \%$, respectively. At $t=5 \mathrm{~s}$, maximum percentage error in the energy is :
3
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Match List - I with List - II
| List - I | List - II | ||
|---|---|---|---|
| (A) | Permeability of free space | (I) | $\left[\mathrm{M} \mathrm{L}^2 \mathrm{~T}^{-2}\right]$ |
| (B) | Magnetic field | (II) | $\left[\mathrm{M} \mathrm{T}^{-2} \mathrm{~A}^{-1}\right]$ |
| (C) | Magnetic moment | (III) | $\left[\mathrm{M} \mathrm{L} \mathrm{T}^{-2} \mathrm{~A}^{-2}\right]$ |
| (D) | Torsional constant | (IV) | $\left[\mathrm{L}^2 \mathrm{~A}\right]$ |
Choose the correct answer from the options given below :
4
JEE Main 2025 (Online) 23rd January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Using the given $P-V$ diagram, the work done by an ideal gas along the path $A B C D$ is :
Paper analysis
Total Questions
Chemistry
25
Mathematics
25
Physics
25
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