NEET 2025

159 Questions • 180 Minutes • 2025

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An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then-

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Two identical charged conducting spheres A and B have their centres separated by a certain distance. Charge on each sphere is $q$ and the force of repulsion between them is $F$. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres A and B (Radii of A and B are negligible compared to the distance of separation so that for calculating force between them they can be considered as point charges) is best given as:

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A container has two chambers of volumes $V_1 = 2$ litres and $V_2 = 3$ litres separated by a partition made of a thermal insulator. The chambers contains $n_1 = 5$ and $n_2 = 4$ moles of ideal gas at pressures $p_1 = 1$ atm and $p_2 = 2$ atm, respectively. When the partition is removed, the mixture attains an equilibrium pressure of:

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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

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The radius of Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 Earth days. Then which of the following is the length of I year on Mercury?

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A body weight 48 N on the surface of the earth. The gravitational force experienced by the body due to the earth at a height equal to one-third the radius of the earth from its surface is:

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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:

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De-Broglie wavelength of an electron orbiting in the $n = 2$ state of hydrogen atom is close to (Given Bohr radius = 0.052 nm)

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An electric dipole with dipole moment $5 \times 10^{-6}$ Cm is aligned with the direction of a uniform electric field of magnitude $4 \times 10^5$ N/C. The dipole is then rotated through an angle of $60^\circ$ with respect to the electric field. The change in the potential energy of the dipole is:

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A photon and an electron (mass $m$) have the same energy $E$. The ratio $(\lambda_{photon}/\lambda_{electron})$ of their de Broglie wavelengths is ($c$ is the speed of light)

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Two gases $A$ and $B$ are filled at the same pressure in separate cylinders with movable pistons of radius $r_A$ and $r_B$, respectively. On supplying an equal amount of heat to both the systems reversibly under constant pressure, the pistons of gas $A$ and $B$ are displaced by 16 cm and 9 cm, respectively. If the change in their internal energy is the same, then the ratio $r_A/r_B$ is equal to

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A physical quantity $P$ is related to four observations $a, b, c$ and $d$ as follows: $P = a^3b^2 / c\sqrt{d}$. The percentage errors of measurement in $a, b, c$ and d are 1%, 3%, 2%, and 4% respectively. The percentage error in the quantity $P$ is

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The intensity of transmitted light when a polaroid sheet, placed between two crossed polarization at $22.5^\circ$ from the polarization axis of one of the polaroid, is ($I_0$ is the intensity or polarised light after passing through the first polaroid):

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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 ($A_Q/A_P$) of the amplitude $A_Q$ of mass $Q$ to the amplitude $A_P$ of mass $P$ is:

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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:

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

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Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. Ar, K$^+$, Cl$^-$, Ca$^{2+}$ and S$^{2-}$ are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si > Al > Mg > Na. E. The atomic radius of Cs is greater than that of Li and Rb. Choose the correct answer from the options given below:

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Match List-I with List-II. [table] List-I (Ion) | List-II (Group Number in Cation Analysis) ; A. Co$^{2+}$ | I. Group-I ; B. Mg$^{2+}$ | II. Group-III ; C. Pb$^{2+}$ | III. Group-IV ; D. Al$^{3+}$ | IV. Group-VI [/table] Choose the correct answer from the options given below:

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Energy and radius of first Bohr orbit of He$^+$ and Li$^{2+}$ are [Given $R_H = 2.18\times10^{-18}$ J, $a_0 = 52.9$ pm]

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Which of the following are paramagnetic? A. $[NiCl_4]^{2-}$ B. $Ni(CO)_4$ C. $[Ni(CN)_4]^{2-}$ D. $[Ni(H_2O)_6]^{2+}$ E. $Ni(PPh_3)_4$ Choose the correct answer from the options given below:

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Paper Info

Exam: NEET
Year: 2025
Questions: 159
Duration: 180 mins

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