NEET 2026 question paper

A particle of mass M moves along the horizontal x-axis from x = 0 to x = L. The coefficient of kinetic friction varies as μₖ(x) = (μ₀/L)·x where μ₀ and L are constants. If the total work done by friction during the motion is −μ₀MgL/n, where g is the acceleration due to gravity, find n.

A photon and an electron, each of 20 eV energy, move in free space. The ratio of linear momentum of electron pₑ to that of photon p_ph, pₑ/p_ph, is: (Take c = 3 × 10⁸ m s⁻¹, e = 1.6 × 10⁻¹⁹ C, mₑ = 9 × 10⁻³¹ kg)

Consider two circuits, (A) and (B), each having two resistors connected to a battery of voltage V. In each circuit, one resistor has a positive temperature coefficient of resistance, +α, i.e. R₀(1 + αΔT), while the other one has a negative temperature coefficient of resistance, −α, i.e. R₀(1 − αΔT). Circuit (A): the two resistors are in series (current I_A). Circuit (B): the two resistors are in parallel (current I_B). As the temperature is increased, the correct option that describes the variation of current in these circuits is:

Assertion A: For an ideal solution formed by mixing liquids P and Q, ΔmixH = 0 and ΔmixV = 0. Reason R: No interactions occur between P and Q. In the light of the above statements, choose the most appropriate answer from the options given below:

Consider the following statements about the solutions formed by mixing two liquids: A. An ideal solution thus formed obeys Raoult's law throughout the composition range. B. Mixture of chloroform and acetone shows negative deviation from Raoult's law. C. Mixture of aniline and phenol shows positive deviation from Raoult's law. The correct option is:

Arrange the following compounds in the increasing order of polarity: A. CH₃CH₂OCH₂CH₃ (Ether) B. CH₃CH₂OH (Alcohol) C. CH₃COCH₃ (Ketone) D. CH₃COOH (Carboxylic acid) Choose the correct answer from the options given below:

Match List-I with List-II. List-I: A. Starch B. Antibody C. Concanavalin A D. Glut-4 List-II: I. Fights infection II. Energy storage III. Glucose transport IV. Lectin Choose the correct answer from the options given below:

Smooth endoplasmic reticulum __________

Sperm motility is due to

Which of the following statements about the reabsorption process in Henle's loop are correct? (a) The descending limb of Henle's loop is permeable to water but almost impermeable to electrolytes. (b) Urine gets concentrated in Henle's loop. (c) Reabsorption of Na⁺ and water takes place in Henle's loop. (d) Active or passive transport of electrolytes occurs in the ascending limb of Henle's loop. Choose the correct answer from the options given below: