1
JEE Main 2025 (Online) 24th January Evening Shift
Numerical
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The ratio of the power of a light source $S_1$ to that the light source $S_2$ is $2 . S_1$ is emitting $2 \times 10^{15}$ photons per second at 600 nm . If the wavelength of the source $S_2$ is 300 nm , then the number of photons per second emitted by $S_2$ is __________ $\times 10^{14}$.

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2
JEE Main 2025 (Online) 24th January Evening Shift
Numerical
+4
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The increase in pressure required to decrease the volume of a water sample by $0.2 \%$ is $\mathrm{P} \times 10^5 \mathrm{Nm}^{-2}$. Bulk modulus of water is $2.15 \times 10^9 \mathrm{Nm}^{-2}$. The value of P is _________ .

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3
JEE Main 2025 (Online) 24th January Evening Shift
Numerical
+4
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JEE Main 2025 (Online) 24th January Evening Shift Physics - Circular Motion Question 4 English

A string of length $L$ is fixed at one end and carries a mass of $M$ at the other end. The mass makes $\left(\frac{3}{\pi}\right)$ rotations per second about the vertical axis passing through end of the string as shown. The tension in the string is __________ ML.

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4
JEE Main 2025 (Online) 24th January Evening Shift
Numerical
+4
-1
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Acceleration due to gravity on the surface of earth is ' $g$ '. If the diameter of earth is reduced to one third of its original value and mass remains unchanged, then the acceleration due to gravity on the surface of the earth is ________ g.

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