Important Practice Questions For NEET UG 2026 (Day 31)

Important Practice Questions For NEET UG 2026 Day 31: Ready to level up your preparation game? Day 31 of Important Practice Questions for NEET UG 2026 is here to challenge your concepts, sharpen your accuracy, and boost your confidence one question at a time!

Whether you’re mastering tricky Biology diagrams, decoding Physics numericals, or untangling Chemistry reactions, today’s practice set is designed to push you a step closer to your dream medical college. So grab your notebook, set a timer, and let’s turn practice into progress!

PHYSICS

Q.1. A block of mass $2\text{kg}$ is pushed along a horizontal frictionless surface with a constant force of $10\text{N}$. What is the work done by this force when the block moves $5\text{m}$?

A. 10J

B. 5J

C. 25J

D. 50J

Q.2. A ball is thrown vertically upwards with an initial speed of $20{\text{m s}}^{-1}$. Neglecting air resistance and taking $g=10{\text{m s}}^{-2}$, what is the maximum height reached by the ball?

A. 40m

B. 20m

C. 30m

D. 10m

Q.3. Which statement correctly describes the behavior of light when it passes from air into a denser medium like glass at an angle other than ${90}^{\circ }$?

A. Its wavelength increases while its speed decreases

B. Its frequency decreases while its speed remains constant

C. Its speed increases and it bends away from the normal

D. Its speed decreases and it bends towards the normal

Q.4. A ray of light passes through the optical centre of a thin convex lens. How will it emerge after refraction by the lens (neglecting any slight thickness)?

A. It will pass undeviated, continuing in the same straight line

B. It will retrace its path back along the incident direction

C. It will bend and pass through the principal focus on the other side

D. It will reflect completely from the lens surface

Q.5. A 2 $\mathrm{\Omega }$ resistor and a 4 $\mathrm{\Omega }$ resistor are connected in parallel across a 12 V battery. What is the total current drawn from the battery?

A. 2 A

B. 6 A

C. 1 A

D. 3 A

CHEMISTRY

Q.6. A radioactive sample has a half-life of 5 years. What fraction of the original radioactive nuclei will remain undecayed after 15 years?

A. $\frac{1}{8}$

B. $\frac{1}{4}$

C. $\frac{1}{2}$

D. $\frac{1}{3}$

Q.7. Which statement correctly describes the effect of increasing temperature on the rate of a reversible chemical reaction according to Le Chatelier’s principle, if the reaction is exothermic in the forward direction?

A. Increasing temperature increases both forward and backward rates equally but does not change equilibrium

B. Increasing temperature shifts the equilibrium towards products, increasing forward reaction yield

C. Increasing temperature shifts the equilibrium towards reactants, decreasing forward reaction yield

D. Temperature has no effect on the equilibrium position of an exothermic reaction

Q.8. An element $X$ forms a chloride ${\text{XCl}}_2$ and an oxide $\text{XO}$. To which group of the modern periodic table does $X$ most likely belong?

A. Group 2

B. Group 13

C. Group 17

D. Group 1

Q.9. Which functional group is present in all amino acids that form proteins in living organisms?

A. Only a carboxyl group $(-\text{COOH})$

B. Only an amino group $(-{\text{NH}}_2)$

C. A phosphate group $(-{\text{PO}}_4^{3-})$ attached to the side chain

D. Both an amino group and a carboxyl group attached to the same α-carbon

Q.10. Which of the following changes will definitely increase the rate of a chemical reaction according to collision theory?

A. Increasing the concentration of reactants in solution

B. Decreasing temperature while keeping concentration constant

C. Increasing the activation energy of the reaction

D. Decreasing the frequency of effective collisions

Read Also: Important NEET UG Diagrams Day 12

BIOLOGY

Q.11. In a healthy nephron, which process is primarily responsible for the selective reabsorption of glucose from the filtrate back into the blood?

A. Osmosis in the Bowman’s capsule

B. Facilitated diffusion in the descending limb of loop of Henle

C. Simple diffusion along the length of the collecting duct

D. Active transport in the proximal convoluted tubule

Q.12. Which of the following statements best explains why enzymes are highly specific in the reactions they catalyse in living cells?

A. They are nonspecific catalysts that speed up all biochemical reactions equally

B. Their active site is complementary in shape and chemical properties to specific substrates

C. Their active site has a fixed shape that fits only one substrate and never changes

D. They are made of DNA, which directly binds only one type of substrate

Q.13. In human reproduction, which event directly triggers ovulation from the mature Graafian follicle?

A. A rapid decline in follicle-stimulating hormone (FSH) levels

B. A sudden surge of luteinizing hormone (LH) from the anterior pituitary

C. The release of gonadotropin-releasing hormone (GnRH) from the hypothalamus at puberty

D. A progressive rise in progesterone throughout the follicular phase

Q.14. Which of the following best explains why genetic recombination is greater in sexually reproducing organisms than in asexually reproducing ones?

A. Asexual reproduction always occurs without DNA replication

B. Sexual reproduction always produces polyploid offspring

C. Sexual reproduction involves mutation but asexual reproduction does not

D. Sexual reproduction involves meiosis and fusion of gametes, creating new allele combinations

Q.15. Which process in cellular respiration directly generates the majority of ATP molecules in aerobic conditions?

A. Glycolysis in the cytoplasm

B. Krebs cycle (citric acid cycle) in the mitochondrial matrix

C. Link reaction (pyruvate to acetyl-CoA) in mitochondria

D. Oxidative phosphorylation via electron transport chain and chemiosmosis

Q.16. In the context of the Hardy-Weinberg principle, which factor would most likely disrupt genetic equilibrium in a large, randomly mating population?

A. Random mating with no selection

B. Large population size and no migration

C. Strong natural selection favoring a particular genotype

D. Absence of mutation

Q.17. Which of the following best explains why the left ventricle of the human heart has a thicker muscular wall than the right ventricle?

A. It pumps blood to the entire body at a higher pressure

B. It pumps blood only to the lungs, which are nearby

C. It needs to maintain a lower pressure to protect capillaries

D. It receives deoxygenated blood from the venae cavae

Q.18. In a typical neuron, which event directly triggers the release of neurotransmitter into the synaptic cleft at a chemical synapse?

A. Opening of sodium channels at the axon hillock

B. Passive diffusion of neurotransmitter back into the presynaptic neuron

C. Binding of neurotransmitter to receptors on the postsynaptic membrane

D. Arrival of an action potential opening voltage-gated calcium channels at the axon terminal

Q.19. In an aquatic ecosystem, which of the following best explains why phytoplankton are placed at the first trophic level?

A. They have the highest biomass among all organisms

B. They are primary consumers that feed directly on zooplankton

C. They are decomposers that recycle nutrients back to water

D. They are primary producers that convert solar energy into chemical energy

Q.20. Which of the following best illustrates stabilizing selection in a natural population?

A. Human birth weight tending to cluster around an intermediate range

B. Beetles evolving much larger bodies over many generations

C. Moths shifting from light-colored forms to dark-colored forms in polluted areas

D. Finch populations splitting into two groups with very small and very large beaks

And that’s a wrap for Day 31! Remember, every question you solve today adds one more brick to your NEET success story. Consistency beats cramming, and daily practice is your secret weapon for cracking NEET UG 2026 with confidence.

Keep revising, keep practicing, and most importantly, keep believing in yourself. See you tomorrow with another power-packed set of questions!

Comment Below For Answers!!

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