NEET 2016 Question Paper - Phase-II Code XX Mock Test

A person can see clearly objects only when they lie between $50\text{cm}$ and $400\text{cm}$ from his eyes. In order to increase the maximum distance of distinct vision to infinity, the type and power of the correcting lens, the person has to use, will be:

A linear aperture whose width is $0.02\text{cm}$ is placed immediately in front of a lens of focal length $60\text{cm}$. The aperture is illuminated normally by a parallel beam of wavelength $5\times 10^{-5}\text{cm}$. The distance of the first dark band of the diffraction pattern from the centre of the screen is:

Electrons of mass $m$ with de-Broglie wavelength $\lambda$ fall on the target in an X-ray tube. The cutoff wavelength (${\lambda }_0$) of the emitted X-ray is:

Photons with energy $5\text{eV}$ are incident on a cathode $C$ in a photoelectric cell. The maximum energy of emitted photoelectrons is $2\text{eV}$. When photons of energy $6\text{eV}$ are incident on $C$, no photoelectrons will reach the anode $A$, if the stopping potential of $A$ relative to $C$ is:

If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength $\lambda$. When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be: