A rod of circular cross-sectional area A and length $L$ is wound uniformly with $n$ turns of an insulated wire. If current flowing through the windings is I, the total magnetic flux produced inside windings is $\phi$. The relative permeability of the rod is ( $\mathrm{N}=$ number of turns per unit length) $\left(\mu_0=\right.$ permeability of vacuum $)$
$\frac{\phi \mathrm{L}}{\mu_0 \mathrm{NIA}}$
$\frac{\phi}{\mu_0 \text { INAL }}$
$\frac{\mu_0 \mathrm{IAN}}{\phi \mathrm{L}}$
$\frac{\mu_0 \mathrm{NA}}{\phi \mathrm{LI}}$
In resistance thermometer, the resistance at $0^{\circ} \mathrm{C}$ and $100^{\circ} \mathrm{C}$ are $6.74 \Omega$ and $7.74 \Omega$ respectively. The temperature corresponding to $6.53 \Omega$ resistance is
$+53^{\circ} \mathrm{C}$
$+21^{\circ} \mathrm{C}$
$-53^{\circ} \mathrm{C}$
$-21^{\circ} \mathrm{C}$
Two bodies A and B have their moments of inertia I and 3I respectively about their axis of rotation. their kinetic energies of rotation are also equal. The ratio of angular momenta of body A to that of body B is
$1: 3$
$3: 1$
$1: \sqrt{3}$
$\sqrt{3}: 1$
Glass has refractive index ' $n$ ' with respect to air and ' $\theta$ ' is the critical angle for a ray of light going from glass to air. If a ray of light is incident from air on the glass with angle of incidence ' $\theta$ ', corresponding angle of refraction is
$\sin ^{-1}\left(\frac{1}{n}\right)$
$\quad \sin ^{-1}(\mathrm{n})$
$\sin ^{-1}\left(\frac{1}{\mathrm{n}^2}\right)$
$\sin ^{-1}\left(\frac{1}{\sqrt{n}}\right)$
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