List of top Questions asked in KEAM- 2026

The enthalpy of vapourisation of diethyl ether is $26.0\text{ kJ mol}^{-1}$ and its normal boiling point is $35^\circ C$. What is the value of $\Delta S^0$ for the conversion of liquid diethyl ether to vapour at $35^\circ C$?
The molecule with square planar structure containing two lone pairs at the central atom is
Which of the following statement is correct?
The correct increasing order of metallic character of the elements Si, Be, Mg, Na and P is
The IUPAC nomenclature of the element with atomic number 105 is unnilpentium. What is its official IUPAC name?
Consider the following metals: Li, Na, K, Cu, Mg and Ag. The metals with the lowest and highest work function are respectively
The kinetic energy of a fast-moving particle of mass $1 \times 10^{-31}\text{ kg}$ is associated with a de Broglie wavelength $63\text{ nm}$ is ($h = 6.3 \times 10^{-34}\text{ Js}$)}
An organic compound contains $40\%$ C and $6.7\%$ $H_2$. What is the empirical formula of the compound?
When a PN junction diode is forward biased, the CORRECT statement is
Which of the following can be used in the output circuit of a diode rectifier to filter ac ripples?
The mass of a proton is $1.0073\text{u}$ and that of a neutron is $1.0087\text{u}$. The binding energy of $_2^4\text{He}$ is approximately (Given: helium nucleus mass = $4.0015\text{u}$)}
The ratio of the longest wavelength of the Lyman series to that of Ballmer series of the hydrogen spectrum is
The work function of a material is $6.6 \text{ eV}$. Then, the threshold wavelength of the metal is approximately (Take $h = 6.6 \times 10^{-34} \text{J.s}$)}
An electron and a proton possess same kinetic energy. If the de Broglie wavelengths of the electron and the proton are $\lambda_e$ and $\lambda_p$ respectively, identify the CORRECT relation.
The primary purpose of using polaroids in sunglasses is to
The width of a fringe is $0.5 \text{ mm}$ in Young’s double slit experiment for a light of wavelength $500\text{ nm}$. If the wave length of light alone is changed to $600 \text{ nm}$, the width of the fringe becomes}
A biconvex lens with equal radii of curvature $R$ has a focal length $f$. If the refractive index of the lens is $\frac{3}{2}$, the focal length of the lens is
The CORRECT statement among the following regarding electromagnetic waves is
The transformer core is laminated in order to
A current of $2 \text{ A}$ produces a magnetic flux of $10^{-3}$ weber per turn in a coil of $1000$ turns. Then, the self-inductance of the coil is
The INCORRECT statement is
The current through a galvanometer of resistance $50 \Omega$ is only $4\%$ of the main current when a shunt resistance is connected. The value of the shunt resistance is approximately
A wire of length $6 \text{ m}$ is bent to form a circular loop of single turn. If the current through the loop is $2 \text{ A}$, the magnetic moment of the circular loop (in $\text{Am}^2$ ) is
A particle of charge 10 times that of an electron is revolving in a circular path of radius $0.5 \text{ m}$. If the frequency of rotation is 10 rotations per second, the magnetic field at the centre of the circular path is approximately ($\mu_0 = 4\pi \times 10^{-7} \text{ Hm}^{-1}$)}
Kirchhoff’s first and second laws are respectively based on the conservation of