NEET 2020 Exam Paper (180 Q) - Mock Test

The capacitance of a parallel plate capacitor with air as medium is $6\mu \text{F}$. With the introduction of a dielectric medium, the capacitance becomes $30\mu \text{F}$. The permittivity of the medium is:(${ϵ}_0=8.85\times 10^{-12}{\text{C}}^2{\text{ N}}^{-1}{\text{ m}}^{-2}$)

Dimensions of stress are:

Assume that light of wavelength $600\text{nm}$ is coming from a star. The limit of resolution of telescope whose objective has a diameter of $2\text{m}$ is:

A series LCR circuit is connected to an ac voltage source. When L is removed from the circuit, the phase difference between current and voltage is $\pi /3$. If instead C is removed from the circuit, the phase difference is again $\pi /3$ between current and voltage. The power factor of the circuit is:

A short electric dipole has a dipole moment of $16\times 10^{-9}\text{C m}$. The electric potential due to the dipole at a point at a distance of $0.6\text{m}$ from the centre of the dipole, situated on a line making an angle of $60^{\circ }$ with the dipole axis is:($\frac{1}{4\pi {ϵ}_0}=9\times 10^9{\text{N m}}^2{\text{/C}}^2$)