NEET UG Physics — Modern Physics previous year questions with solutions.
A nuclear reaction given by ${ }_z \mathrm{X}^{\mathrm{A}} \rightarrow{ }_{z+1} \mathrm{Y}^{\mathrm{A}}+-1^{e^0}+\bar{v}$ represents:
A deuteron is bombard on ${ }_8 \mathrm{O}^{16}$ nuclei than $\alpha$-particle is emitted then the product nuclei is:
For the given circuit of the $p-n$ junction diode which is correct? 
For which logic gate, the given truth table is shown? 
Which of the following are suitable for the process?
A sample of radioactive element contains $4 \times 10^{16}$ active nuclei. The half-life of the element is 10 decays, then number of decayed nuclei after 30 days is:
${ }_{92} \mathrm{U}^{235}$ nucleus absorbs a neutron and disintegrates in ${ }_{54} \mathrm{Xe}^{139},{ }_{38} \mathrm{Sr}^{94}$ and $x$. What will be the product $x$ ?
The value of Planck's constant is:
If particles are moving with the same velocity, then the de Broglie wavelength is maximum for:
Which of the following is not the property of cathode rays?
When ultraviolet rays incident on metal plate then the photoelectric effect does not occur, it occurs by incidence of:
In a $p-n$ junction: