List of top Physics Questions asked in CUET (UG)

When an external operating bias voltage is applied to a standard P-N junction semiconductor diode under a forward bias configuration, how do the width of the internal depletion region and the height of the contact barrier potential change?
What is the ratio of the shortest wavelength present in the Lyman series of hydrogen spectral emissions to the shortest wavelength present in the Balmer series?
An object is placed at a distance of $20\,\text{cm}$ in front of a concave mirror of focal length $15\,\text{cm}$. What is the nature and magnification ($m$) of the image produced by the mirror?}
In a series $LCR$ circuit connected to an AC source of variable frequency, the values are given as $L = 2\,\text{H}$, $C = 32\,\mu\text{F}$, and $R = 10\,\Omega$. What is the resonant angular frequency $\omega_r$ of this circuit system?}
A straight metallic rod of length $L$ is oriented horizontally and dropped vertically downward with a speed $v$ perpendicular to the horizontal component of the Earth's uniform magnetic field $B_H$. The instantaneous motional electromotive force (EMF) induced across the two ends of this rod is:
A material specimen exhibits a small, negative magnetic susceptibility ($\chi < 0$) at room temperature. When placed inside a non-uniform magnetic field, this specimen experiences a net force pushing it. How will this material behave?
A particle carrying a positive charge $q$ moves with a velocity vector $\vec{v} = v\hat{i}$ into a uniform magnetic field region specified by $\vec{B} = B\hat{j}$. What is the vector direction of the magnetic Lorentz force acting on this particle at that instant?}
Three point charges $+q$, $+q$, and $-q$ are placed at the vertices of an equilateral triangle of side length $L$. The net electrostatic potential energy of this system of charges is given by:
A balanced Wheatstone bridge consists of four resistances $P = 10\,\Omega$, $Q = 20\,\Omega$, $R = 15\,\Omega$, and $S$. If the positions of the galvanometer and the battery are interchanged, the balancing condition will remain valid. What is the value of the unknown resistance $S$ under the balanced condition?
The magnetic field at the center of a circular current carrying loop depends on:
The focal length of a convex lens is $20\text{ cm}$. An object is placed at $40\text{ cm}$ from the lens. The image formed will be:
The half-life of a radioactive substance is $10$ days. The fraction of the original sample left after $30$ days is:
In an electromagnetic wave, the electric field and magnetic field are:
The SI unit of magnetic flux is:
In a moving coil galvanometer, the magnetic field is made radial so that the:
The work function of a metal is $2\text{ eV}$. Photoelectric emission will occur when the metal is illuminated with light of energy:
Polarisation of light proves that light waves are:
The dimensional formula of capacitance is:
In Young’s double slit experiment, if the distance between the slits is increased while keeping all other parameters constant, the fringe width will:
Two infinite plane parallel sheets, separated by a distance $d$ have equal and opposite uniform charge densities $\sigma$. Electric field at a point between the sheets is
Which of the following statements is not true about electric field lines?
If the charge on an object is doubled then electric field becomes
Under the action of a given coulombic force the acceleration of an electron is 2.5 $\times$ 10²² m s⁻². Then the magnitude of the acceleration of a proton under the action of same force is nearly
The nucleus of helium atom contains two protons that are separated by a distance 3.0 $\times$ 10⁻¹⁵ m. The magnitude of the electrostatic force that each proton exerts on the other is
A steady current $I$ flow through a long straight wire of radius ‘$a$’. The current is uniformly distributed across its cross section. The ratio of the magnetic fields due to the wire at distance $\frac{a}{4}$ and $3a$ respectively from the axis of the wire is