List of top Questions asked in KEAM- 2025

Which of the following statement is INCORRECT?

Which of the following species will have the largest and the smallest sizes respectively? Na, Mg, $Na^{+}$, $Mg^{2+}$

For hydrogen atom, the orbitals with the lowest energy among the given orbitals are: (i) $4s$ (ii) $2p_x$ (iii) $3d_{z^2}$ (iv) $2p_y$

A sub-atomic particle of mass $6.63\times10^{-31}\ \text{kg}$ is moving with a velocity of $1\times10^{6}\ \text{m s}^{-1}$. What is the de Broglie wavelength (in nm) associated with it ($h=6.63\times10^{-34}\ \text{J s}$)?

How many moles of methane are required to produce $11\ \text{g}$ $CO_{2(g)}$ after combustion? (Molar mass of $CO_{2}=44\ \text{g mol}^{-1}$)

A p-n junction diode without any voltage biasing acts as:

The possible number of energy states in a Ge crystal containing $5\times10^{3}$ atoms is:

A radioactive element with $6\times10^{5}$ atoms initially is left with $0.75\times10^{5}$ undecayed atoms in $48$ years. The half-life is:

In the hydrogen spectrum, the shortest wavelength of the Brackett series is produced during the transition:

An electron is accelerated from rest by 480 V, its wavelength is $\lambda$. If accelerated by 120 V, the wavelength is:

Which one of the following statements is INCORRECT regarding the photoelectric effect?

Light energy is redistributed in:

An unpolarized light incident on a plane glass surface gets totally polarized on reflection. If the refractive index of glass is $\tan 57^{\circ}$, then the angle of refraction is:

Chromatic aberration arises in thick lenses due to:

An electromagnetic wave travelling in vacuum has its electric field component, $E=15\sin(1.57y+5.4t)\hat{j}$. The wavelength of the wave is:

When a current changes at the rate of $30\ \text{A s}^{-1}$, the induced emf is $12\ \text{V}$. The self-inductance of the coil is:

If an inductor coil of self-inductance 2 H stores 25 J of magnetic energy, then the current I passing through it is:

Which one is not a ferromagnetic material?

Two charged particles of same mass but charges in ratio 1:4 enter a uniform perpendicular magnetic field. The ratio of their time periods is:

A coil having 100 turns and area $0.02\ \text{m}^{2}$ is placed perpendicular to a magnetic field of $1\ \text{Wb m}^{-2}$. The magnetic flux linked with the coil is:

A wire of $25\ \Omega$ resistance is cut into n pieces of equal length. If these pieces are connected in parallel, the equivalent resistance is $1\ \Omega$, then n is:

The resistance of a wire at $30^{\circ}\text{C}$ and $40^{\circ}\text{C}$ are respectively $5\ \Omega$ and $6\ \Omega$. The temperature coefficient of resistance is:

The value of R in the given circuit is:

The equivalent capacitance of n capacitors of equal capacitance when connected in series and parallel are respectively $0.4\ \mu F$ and $10\ \mu F$. The capacitance of each capacitor is:

A charge of 5 C is moved from a point P to another point Q by doing a work of 10 J. If the potential at P is 0.5 V, then the potential at Q is: