NEET (UG) 2025 Questions

Consider the following compounds: $K{O}_2$, $H_2{O}_2$ and $H_{2}S{O}_4$. The oxidation states of the underlined elements in them are, respectively:

A uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall making an angle of $60^{\circ }$ with it. The other end rests on a rough horizontal floor. The friction force that the floor exerts on the rod is (take $g=10{\text{m s}}^{-2}$).

Find the statement that is NOT correct with regard to the structure of a monocot stem.

For the reaction $\mathrm{A}(\mathrm{g})\rightleftharpoons 2\mathrm{B}(\mathrm{g})$, the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 at $1000\mathrm{K}$. $K_p$ for the reaction at $1000\mathrm{K}$ is [Given: $R=0.0831\mathrm{L}\mathrm{atm}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$]

Consider a water tank shown in the figure. It has one wall at $x=L$ and is very wide in the $z$-direction. When filled with a liquid of surface tension $S$ and density $\rho$, the liquid surface makes a small angle ${\theta }_0({\theta }_0\ll 1)$ with the $x$-axis at $x=L$. If $y(x)$ is the height of the surface, the equation for $y(x)$ is: {width=200px height=200px} (take $\theta (x)=\sin \theta (x)=\tan \theta (x)=\frac{dy}{dx}$, $g$ is the acceleration due to gravity)

Which one of the following is the characteristic feature of gymnosperms?

If the rate constant of a reaction is $0.03{\mathrm{s}}^{-1}$, how much time does it take for $7.2\mathrm{mol}{\mathrm{L}}^{-1}$ concentration of the reactant to get reduced to $0.9\mathrm{mol}{\mathrm{L}}^{-1}$? (Given: $\log 2=0.301$)

The electric field in a plane electromagnetic wave is given by $E_z=60\cos (5x+1.5\times 10^{9}t)\text{V/m}$. Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field):

The current passing through the battery in the given circuit is: {width=300px height=200px}

Identify the suitable reagent for the following conversion {width=400px height=200px}

A ball of mass $0.5$ kg is dropped from a height of $40$ m. The ball hits the ground and rises to a height of $10$ m. The impulse imparted to the ball during its collision with the ground is (Take $g=9.8{\text{m/s}}^2$)

Two identical point masses $P$ and $Q$, suspended from two separate massless springs of spring constants $k_1$ and $k_2$, respectively, oscillate vertically. If their maximum speeds are the same, the ratio of the amplitude $A_Q$ of mass $Q$ to the amplitude $A_P$ of mass $P$ is:

A particle of mass $m$ is moving around the origin with a constant force $F$ pulling it towards the origin. If Bohr model is used to describe its motion, the radius $r$ of the $n$th orbit and the particle's speed $v$ in the orbit depend on $n$ as

A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to:

A wire of resistance $R$ is cut into $8$ equal pieces. From these pieces two equivalent resistances are made by adding four of these together in parallel. Then these two sets are added in series. The net effective resistance of the combination is:

Polymerase chain reaction (PCR) amplifies DNA following the equation:

What is the main function of the spindle fibers during mitosis?

Who proposed that the genetic code for amino acids should be made up of three nucleotides?

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes $n=2\to n=3$ and $n=4\to n=6$ transitions, respectively, is

Energy and radius of first Bohr orbit of $\mathrm{H}{\mathrm{e}}^{+}$ and $\mathrm{L}{\mathrm{i}}^{2+}$ are given. [$R_H=2.18\times 10^{-18}\mathrm{J}$, $a_0=52.9\mathrm{pm}$]. Choose the correct set: