1
JEE Main 2024 (Online) 9th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The dimensional formula of latent heat is :

A
$$\left[\mathrm{M}^{\mathrm{0}} \mathrm{LT}^{-2}\right]$$
B
$$\left[\mathrm{MLT}^{-2}\right]$$
C
$$\left[\mathrm{M}^0 \mathrm{~L}^2 \mathrm{~T}^{-2}\right]$$
D
$$\left[\mathrm{ML}^2 \mathrm{~T}^{-2}\right]$$
2
JEE Main 2024 (Online) 9th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A sphere of relative density $$\sigma$$ and diameter $$D$$ has concentric cavity of diameter $$d$$. The ratio of $$\frac{D}{d}$$, if it just floats on water in a tank is :

A
$$\left(\frac{\sigma-2}{\sigma+2}\right)^{1 / 3}$$
B
$$\left(\frac{\sigma+1}{\sigma-1}\right)^{1 / 3}$$
C
$$\left(\frac{\sigma-1}{\sigma}\right)^{1 / 3}$$
D
$$\left(\frac{\sigma}{\sigma-1}\right)^{1 / 3}$$
3
JEE Main 2024 (Online) 9th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The volume of an ideal gas $$(\gamma=1.5)$$ is changed adiabatically from 5 litres to 4 litres. The ratio of initial pressure to final pressure is :

A
$$\frac{4}{5}$$
B
$$\frac{8}{5 \sqrt{5}}$$
C
$$\frac{2}{\sqrt{5}}$$
D
$$\frac{16}{25}$$
4
JEE Main 2024 (Online) 9th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is $$1.42 \mathrm{~eV}$$. The wavelength of light emitted from the LED is :

A
1243 nm
B
875 nm
C
650 nm
D
1400 nm
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