NEET UG Daily Practice Questions For 2026 to score 650+ (DAY 17)

Welcome to NEET UG Daily Practice Questions For 2026 – DAY 17. If you’re still here, still solving, and still chasing that 650+ dream, give yourself a pat on the back already. Day 17 means you’ve officially crossed the “I’ll start tomorrow” phase and entered the “no excuses, only questions” zone. Today’s set is designed to sharpen your concepts, test your calm under pressure, and remind you that every MCQ you solve today is one less silly mistake on exam day. Let’s get into it – NEET doesn’t wait, and neither do toppers.

PHYSICS

Q.1. A ball is projected horizontally from the top of a smooth cliff with speed u. Neglecting air resistance, which graph best represents the magnitude of its velocity v as a function of time t? Take acceleration due to gravity as g.

A. A curve starting from v=u that becomes steeper with time

B. A straight line starting from v=0 with slope g

C. A horizontal line at v=u

D. A straight line starting from v=u with slope g

Q.2. A particle of mass $m$m moves in a circle of radius $R$R under a central potential $V(r)=k{r}^2$, where k>0. If its angular momentum is $L$, which expression best represents the condition for a stable circular orbit?

A. $L^2=mk{R}^4$

B. $L^2={\displaystyle \frac{mk}{R^2}}$

C. $L^2=2mk{R}^4$

D. $L^2=4mk{R}^4$

Q.3. Which statement about vectors in physics is correct?

A. Two vectors are equal only if they have the same magnitude and direction

B. The sum of two non-zero vectors is always greater in magnitude than each individual vector

C. Two vectors with equal magnitudes are always equal

D. A vector is fully specified by its magnitude alone

Q.4. A projectile is thrown with initial speed $u$ at an angle $\theta$ above the horizontal. Neglecting air resistance, which statement about its motion is correct?

A. Acceleration is always vertically downward and constant in magnitude

B. Resultant acceleration becomes zero at the highest point

C. Horizontal component of velocity keeps decreasing due to gravity

D. Vertical component of velocity remains constant throughout the motion

Q.5. A ray of light enters a glass slab (μ=1.5) from air at an angle of incidence $i$. It undergoes two internal reflections from the parallel faces and finally emerges into air parallel to the incident ray but displaced laterally. For which of the following ranges of $i$ will total internal reflection definitely occur at both reflections inside the slab? ${\mu }_{\text{air}}=1$.

A. ${41.8}^{\circ }<i<{90}^{\circ }$

B. $i>{41.8}^{\circ }$

C. ${41.8}^{\circ }<i<{60}^{\circ }$

D. $i>{60}^{\circ }$

Read Also: NEET UG Daily Practice Questions For 2026 to score 650+ (DAY 16)

CHEMISTRY

Q.6. A gas in a closed container is heated at constant volume from temperature $T_1$to $T_2$. Which statement best explains the change in pressure according to kinetic theory?

A. Pressure increases because molecules move faster and hit the walls more frequently and more forcefully

B. Pressure first increases, then decreases as temperature rises

C. Pressure remains constant because volume is fixed

D. Pressure decreases because molecules spread out inside the container

Q.7. In chemical kinetics, for a reaction where the rate is given by $\text{Rate}=k[A{]}^2[B]$, what happens to the rate if the concentration of $[A]$ is doubled and $[B]$ is halved?

A. The rate becomes half

B. The rate becomes double

C. The rate becomes four times

D. The rate remains unchanged

Q.8. A buffer solution is made by mixing acetic acid and sodium acetate in water. What will happen to the pH if a small amount of HCl is added?

A. pH will increase significantly

B. Solution will immediately become strongly basic

C. pH will drop drastically to a very low value

D. pH will remain almost unchanged, decreasing only slightly

Q.9. Which of the following is the correct order of acidic strength in aqueous solution?

A. HI< HBr< HCl< HF

B. HCl< HF< HBr< HI

C. HF< HCl< HBr< HI

D. HF< HBr< HCl< HI

Q.10. For the complex ion $[{\text{Fe(CN)}}_6{]}^{4-}$, which statement is correct regarding its magnetic behavior and type of hybridization at the central metal ion? (Atomic number of Fe = 26)

A. It is paramagnetic with $s{p}^3{d}^2$ hybridization.

B. It is diamagnetic with $s{p}^3{d}^2$ hybridization.

C. It is paramagnetic with $d^{2}s{p}^3$ hybridization.

D. It is diamagnetic with $d^{2}s{p}^3$ hybridization.

Read Also: Most Important Biology Diagram For NEET UG 2026 to Score 650+ (Day 2)

BIOLOGY

Q.11. In human reproduction, which event directly triggers ovulation in a typical menstrual cycle?

A. A rapid fall in estrogen level below baseline

B. A sudden decrease in progesterone level

C. A surge in luteinizing hormone (LH) from the anterior pituitary

D. An increase in follicle-stimulating hormone (FSH) late in the luteal phase

Q.12. Which of the following pairs is correctly matched regarding disorders and the system primarily affected?

A. Nephritis – Nervous system

B. Myasthenia gravis – Immune system targeting neuromuscular junction

C. Goitre – Excretory system

D. Emphysema – Digestive system

Q.13. A person at high altitude experiences difficulty in breathing and fatigue. Which immediate physiological change primarily helps the body adapt in the short term?

A. Increase in breathing rate to improve oxygen uptake

B. Complete dependence on anaerobic respiration in all tissues

C. Decrease in red blood cell production

D. Decrease in heart rate to reduce oxygen consumption

Q.14. Which statement about ecosystem energy flow is most accurate?

A. Decomposers produce new energy that enters the ecosystem

B. Energy flows in one direction, from producers to consumers to decomposers, with loss as heat at each step

C. Consumers can convert heat energy from the environment back into chemical energy for the food chain

D. Energy is recycled endlessly within an ecosystem

Q.15. Which of the following best describes a facilitated diffusion process across a cell membrane?

A. Diffusion of any molecule directly through the phospholipid bilayer without the help of proteins

B. Movement of solute down its concentration gradient using specific carrier proteins, without energy expenditure

C. Bulk movement of fluid and solutes by infolding of the membrane forming vesicles

D. Movement of solute against its concentration gradient using ATP

And that’s a wrap for DAY 17, Share Your Scores in Comments!

Some questions felt easy, some probably made you question your life choices, and that’s exactly how growth looks in NEET prep. Remember, it’s not about getting everything right today; it’s about getting better every single day. Review your mistakes, revise smartly, hydrate (yes, seriously), and come back stronger for DAY 18.

ANSWERS & EXPLANATIONS

Ans.1. A. A curve starting from $v=u$ that becomes steeper with time. The speed is calculated using $v=\sqrt{u^2+(gt{)}^2}$ t=0, the vertical component is zero, so v=u. As time passes, the vertical component grows, increasing the resultant speed. This increase is not linear because of the square-root relationship.

Ans.2. C. L2=2mkR4

Ans.3. A.  Two vectors are equal only if they have the same magnitude and direction. This criterion reflects the geometric nature of vectors as directed line segments, emphasizing both length and orientation.

Ans.4. A. Acceleration is always vertically downward and constant in magnitude. This constant gravitational acceleration shapes the parabolic path of the projectile and ensures that its vertical velocity changes continuously, while the horizontal velocity remains unchanged in the absence of air resistance.

Ans.5. A. 41.8°<i<90°. The key is the critical angle at the glass–air interface: $\sin c={\displaystyle \frac{1}{1.5}}\Rightarrow c\approx {41.8}^{\circ }$. When the ray enters the slab, its refracted angle $r$ satisfies $\sin r={\displaystyle \frac{\sin i}{1.5}}$ For total internal reflection at the internal surfaces, the internal angle of incidence must exceed $c$. This happens when r>c, which corresponds to incident angles i greater than c. 

Ans.6. A. Pressure increases because molecules move faster and hit the walls more frequently and more forcefully. According to kinetic theory, the average kinetic energy of the gas molecules is directly proportional to the absolute temperature, so as temperature goes up, molecular speeds increase. This leads to a higher rate of collisions and greater momentum change per collision, which together cause an increase in pressure in a fixed volume container.

Ans.7. B.  The rate becomes double. Detailed substitution into the rate law $\text{Rate}=k[A{]}^2[B]$ confirms that the combined concentration changes produce a net factor of 2 increase in the rate.

Ans.8. D. pH will remain almost unchanged, decreasing only slightly. The buffer works based on the equilibrium between acetic acid and acetate ion. 

Ans.9. C. HF<HCl<HBr<HI. The central factor for acid strength in this series is the ease of H–X bond cleavage and the stability of the resulting anion. 

Ans.10. D. It is diamagnetic with $d^{2}s{p}^3$ hybridization. Because ${\text{CN}}^{-}$ produces a large splitting (${\mathrm{\Delta }}_0$), the configuration $t_{2g}^6{e}_g^0$ results, with all electrons paired. This means the complex is low-spin and diamagnetic. The inner $3d$ orbitals are used in forming the $d^{2}s{p}^3$hybrid set for octahedral bonding, consistent with an inner-orbital complex.

Ans. 11. C. Mid-cycle, a sharp increase in luteinizing hormone (LH) secretion from the anterior pituitary, known as the LH surge, directly triggers ovulation. This surge is induced by sustained high estrogen levels from the dominant follicle, which briefly switch from negative to positive feedback on the hypothalamus and pituitary. 

Ans.12. B. Myasthenia gravis – Immune system targeting neuromuscular junction. It accurately highlights an autoimmune process where the immune system targets neuromuscular structures, causing muscular weakness and demonstrating the interplay between immunity and neuromuscular physiology.

Ans.13. A. Increase in breathing rate to improve oxygen uptake. Immediately upon exposure to high altitude, chemoreceptors sense the lower partial pressure of oxygen in the blood. The respiratory center responds by increasing ventilation, both rate and depth of breathing. This hyperventilation helps bring more air into the lungs per minute, raising the amount of oxygen that can diffuse into the blood even when each breath contains less oxygen than at sea level.

Ans.14. B. Energy flows in one direction, from producers to consumers to decomposers, with loss as heat at each step. Solar or other external energy is captured by producers, passed along trophic levels, and lost as heat during metabolic processes. This one-way energy movement explains why ecosystems require a constant external energy input to persist.

Ans.15. D.  Movement of solute down its concentration gradient using specific carrier proteins, without energy expenditure. In facilitated diffusion, polar or charged molecules that cannot easily cross the hydrophobic core of the lipid bilayer use specific membrane proteins, such as carrier or channel proteins, to move across. The driving force is the concentration or electrochemical gradient, and no ATP is consumed. The process is selective and can exhibit saturation because the number of transport proteins is limited.