NEET UG 2026 Daily Practice Questions To Score 650+ (DAY 23)

NEET UG 2026 Daily Practice Questions: Hello! future doctors! Day 23 of your Daily MCQ Practice is here, and guess what? Every single question you solve today is one step closer to that magical 650+ score and your dream white coat. Think of this session as a quick brain workout- no stress, just smart revision, sharp concepts, and a little confidence boost. So grab your pen, take a deep breath, and let’s turn today’s practice into tomorrow’s success!

PHYSICS

Q.1. A stone is thrown vertically upward with an initial velocity of $20{\text{m s}}^{-1}$. Ignore air resistance. Which graph best represents the variation of its velocity $v$ with time $t$ during its entire flight? Take $g=10{\text{m s}}^{-2}$.

A. A horizontal line at $v=20{\text{m s}}^{-1}$ from $t=0$ to $t=2\text{s}$.

B. A straight line with slope $-10{\text{m s}}^{-2}$, cutting the velocity axis at $20{\text{m s}}^{-1}$ and the time axis at 2s.

C. A straight line with slope $+10{\text{m s}}^{-2}$, passing through the origin.

D. A straight line with slope $-10{\text{m s}}^{-2}$ starting from the origin.

Q.2. An object is placed between the optical center and focal point of a convex lens. Which of the following best describes the nature and position of the image formed?

A. Virtual, erect, and formed on the same side of the lens as the object.

B. Virtual, inverted, and formed at the focal plane on the opposite side of the lens.

C. Real, inverted, and formed beyond 2F.

D. Real, erect, and formed between F and 2F.

Q.3. Which of the following best explains why metals are good conductors of electricity?

A. The metallic bond locks all electrons tightly between specific pairs of atoms, preventing their movement.

B. Metals contain free electrons that can move throughout the lattice when an electric field is applied.

C. Electric current in metals is carried mainly by the movement of positive metal ions through the lattice.

D. Metal atoms have completely filled valence shells, so electrons cannot move easily.

Q.4. A body of mass 2kg is moving with a velocity of $3{\text{m s}}^{-1}$. A constant force acts on it in the direction of motion and increases its velocity to $7{\text{m s}}^{-1}$. What is the work done by the force on the body?

A. 20J

B. 10J

C. 40J

D. 56J

Q.5. Which of the following correctly relates the focal length f, radius of curvature R, and refractive index n of a thin spherical refracting surface between media with refractive indices $n_1$(object side) and $n_2$ (image side)?

A. ${\displaystyle \frac{n_2}{v}}-{\displaystyle \frac{n_1}{u}}={\displaystyle \frac{n_2-n_1}{R}}$ and ${\displaystyle \frac{1}{f}}={\displaystyle \frac{n_2-n_1}{R}}$ when the object is at infinity.

B. ${\displaystyle \frac{1}{v}}+{\displaystyle \frac{1}{u}}={\displaystyle \frac{2}{R}}$ and $f=R$ for any spherical surface.

C. ${\displaystyle \frac{n_1}{v}}-{\displaystyle \frac{n_2}{u}}={\displaystyle \frac{n_1-n_2}{R}}$and ${\displaystyle \frac{1}{f}}={\displaystyle \frac{n_1+n_2}{R}}$ when the image is at infinity.

D. ${\displaystyle \frac{n_2}{v}}+{\displaystyle \frac{n_1}{u}}={\displaystyle \frac{n_2-n_1}{R}}$ and $f=2R$ for refraction at a spherical surface.

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CHEMISTRY

Q.6. Which of the following best describes the relation between Gibbs free energy change ΔG, enthalpy change ΔH, entropy change ΔS, and temperature T for a chemical reaction at constant temperature and pressure?

A. $\mathrm{\Delta }G=T\mathrm{\Delta }H-\mathrm{\Delta }S$

B. $\mathrm{\Delta }G=\mathrm{\Delta }H+T\mathrm{\Delta }S$

C. $\mathrm{\Delta }G={\displaystyle \frac{\mathrm{\Delta }H}{T}}+\mathrm{\Delta }S$

D. $\mathrm{\Delta }G=\mathrm{\Delta }H-T\mathrm{\Delta }S$

Q.7. A solution contains both NaCl and ${\text{AgNO}}_3$ in water. Which of the following observations indicates that a chemical reaction has occurred when these solutions are mixed?

A. A white precipitate forms, identified as AgCl.

B. The solution remains clear and colorless with no visible change.

C. The temperature of the solution stays exactly the same as before mixing.

D. The volume of the solution decreases slightly due to mixing.

Q.8. Which statement most accurately describes the Bohr model of the hydrogen atom?

A. Electrons can have any energy and orbit at any distance from the nucleus, but emit radiation only when colliding with other electrons.

B. Electrons occupy fixed positions in the nucleus and do not move; spectral lines arise from nuclear transitions.

C. Electrons are treated as standing waves spread uniformly throughout all space with no quantization of energy.

D. Electrons move in circular orbits around the nucleus and can exist only in certain allowed orbits where their angular momentum is quantized in integral multiples of $\mathrm{\hslash }$ℏ.

Q.9. Which statement about the p-type semiconductor is most accurate?

A. It is formed by doping pure silicon with a pentavalent impurity, creating extra electrons as majority carriers.

B. It is formed by doping pure silicon with a trivalent impurity, creating holes as majority carriers.

C. It is formed by removing all impurities from silicon, so that it has only intrinsic charge carriers.

D. It conducts only at very low temperatures because thermal energy destroys the holes.

Q.10. In the context of coordination compounds, which statement about ligands is most appropriate?

A. A ligand must be a neutral molecule; charged species cannot act as ligands.

B. Ligands always donate two electrons and therefore must be bidentate.

C. Ligands are species that accept electron pairs from the metal ion, behaving as Lewis acids.

D. A ligand is any ion or molecule that can donate one or more lone pairs of electrons to a central metal atom/ion to form a coordinate bond.

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BIOLOGY

Q.11. In human physiology, which change would most likely trigger an increase in the rate and depth of breathing via the respiratory center in the medulla oblongata?

A. A significant decrease in blood ${\text{CO}}_2$ concentration and a rise in blood pH.

B. A slight decrease in blood temperature with no change in ${\text{CO}}_2$ levels.

C. A stable blood ${\text{CO}}_2$ concentration with a slight rise in blood pH.

D. An increase in blood ${\text{CO}}_2$ concentration leading to a fall in blood pH.

Q.12. Which of the following conditions is most essential for Hardy-Weinberg equilibrium in a large randomly mating population?

A. High mutation rate introducing new alleles every generation.

B. Strong natural selection favoring the fittest genotypes.

C. Frequent migration of individuals between populations.

D. No selection, no migration, no mutation, and random mating.

Q.13. Which of the following is the best example of adaptive radiation?

A. The temporary physiological increase in red blood cell count in humans living at high altitude.

B. The evolution of different beak shapes in Darwin’s finches on the Galápagos Islands from a common ancestor.

C. The development of similar body shapes in sharks and dolphins due to similar aquatic habitats.

D. Seasonal changes in coat color of Arctic foxes from brown to white.

Q14. A patient is given a hypertonic saline solution intravenously by mistake. What is the most likely immediate effect on the patient’s red blood cells (RBCs)?

A. There will be no net movement of water because the solution is isotonic to blood.

B. Water will diffuse out of RBCs, causing them to shrink and become crenated.

C. Water will diffuse into RBCs, causing them to swell and possibly burst (hemolysis).

D. The saline will directly supply energy to RBCs, increasing their ATP production.

Q.15. Which of the following is the correct sequence of events in the cardiac cycle immediately after the sinoatrial (SA) node generates an action potential?

A. Impulse spreads through atria causing atrial contraction → Impulse reaches AV node → Impulse travels through bundle of His and Purkinje fibers causing ventricular contraction.

B. Ventricular contraction → Atrial contraction → Impulse spreads to atrioventricular (AV) node → Relaxation of all chambers.

C. Impulse directly stimulates ventricles to contract → Atria contract → AV node is activated → All chambers relax.

D. Impulse first reaches AV node, causing ventricular contraction, and then spreads to atria, causing atrial contraction.

And that’s a wrap for Day 23! Whether you nailed every question or discovered a few tricky spots, remember- progress matters more than perfection. Keep showing up, keep practicing, and keep believing in yourself, because consistency is the real topper’s secret.

ANSWERS & EXPLANATIONS

Ans.1. B. A straight line with slope $-10{\text{m s}}^{-2}$, cutting the velocity axis at $20{\text{m s}}^{-1}$ and the time axis at 2s. This graph captures the fact that the stone slows down uniformly to zero velocity at the top and then gains speed in the downward direction, which is represented by negative velocity values on the same straight line.

Ans.2. A. Virtual, erect, and formed on the same side of the lens as the object. This follows from ray diagrams for a convex lens with an object located within the focal length, where the refracted rays diverge and their backward extensions intersect on the same side as the object, forming a magnified, upright virtual image.

Ans.3. B. Metals contain free electrons that can move throughout the lattice when an electric field is applied. These delocalized electrons, not the metal ions, drift under the influence of an electric field, giving rise to conduction in metallic solids.

Ans.4. C. 40J The change in kinetic energy is $\frac{1}{2}m(v^2-u^2)$21 . For $m=2\text{kg}$, $u=3{\text{m s}}^{-1}$, and $v=7{\text{m s}}^{-1}$, this gives $\frac{1}{2}\times 2(49-9)=40\text{J}$. 

Ans.5. A. ${\displaystyle \frac{n_2}{v}}-{\displaystyle \frac{n_1}{u}}={\displaystyle \frac{n_2-n_1}{R}}$ and ${\displaystyle \frac{1}{f}}={\displaystyle \frac{n_2-n_1}{R}}$ when the object is at infinity, appropriately interpreted with sign conventions and the chosen reference medium.

Ans.6. D. ΔG = ΔH–TΔS. This relation correctly balances the contributions of enthalpy and entropy to the free energy change at constant temperature and pressure.

Ans.7. A. A white precipitate forms, identified as AgCl. This precipitate forms when ${\text{Ag}}^{+}$ions from ${\text{AgNO}}_3$ react with ${\text{Cl}}^{-}$ ions from $\text{NaCl}$ to form insoluble silver chloride: ${\text{Ag}}^{+}(aq)+{\text{Cl}}^{-}(aq)\to \text{AgCl}(s)$.

Ans.8. D. Electrons move in circular orbits around the nucleus and can exist only in certain allowed orbits where their angular momentum is quantized in integral multiples of $\mathrm{\hslash }$. This quantization leads to discrete energy levels and explains the line spectrum of hydrogen.

Ans.9. B.  It is formed by doping pure silicon with a trivalent impurity, creating holes as majority carriers. This controlled addition of impurities intentionally increases the number of holes and enhances conductivity in a predictable way.

Ans.10. D.  A ligand is any ion or molecule that can donate one or more lone pairs of electrons to a central metal atom/ion to form a coordinate bond. This reflects the Lewis base nature of ligands in coordination chemistry.

Ans.11. D. An increase in blood ${\text{CO}}_2$ concentration leading to a fall in blood pH. This situation is quickly sensed by chemoreceptors, which activate the respiratory center in the medulla to increase ventilation. By breathing more rapidly and deeply, the body expels more ${\text{CO}}_2$, which reduces carbonic acid formation and helps normalize blood pH.

Ans.12. D. No selection, no migration, no mutation, and random mating. Together with large population size, these conditions ensure that evolutionary forces are effectively absent, so allele and genotype frequencies remain constant from generation to generation, satisfying Hardy–Weinberg equilibrium.

Ans.13. B. The evolution of different beak shapes in Darwin’s finches on the Galápagos Islands from a common ancestor. This is a classic example of adaptive radiation, where speciation and adaptation to varied ecological opportunities occur in a relatively short evolutionary time span.

Ans.14. B. Water will diffuse out of RBCs, causing them to shrink and become crenated. In a hypertonic environment, water leaves the cells to balance solute concentrations, leading to cell shrinkage.

Ans.15. A.  Impulse spreads through atria, causing atrial contraction → Impulse reaches AV node → Impulse travels through bundle of His and Purkinje fibers, causing ventricular contraction. This sequence ensures efficient filling and pumping of blood.

We truly love seeing your dedication and enthusiasm, so do share your thoughts and scores with us; it keeps us motivated to bring you better practice every day. See you tomorrow for Day 24 with the same energy, but bigger dreams!

ALL THE BEST

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