Daily Practice Questions For NEET UG 2026 to score 650+ (DAY 19)

Daily Practice Questions For NEET UG 2026: Dreaming of a 650+ score in NEET UG 2026? You’re one step closer! Welcome to Day 19 of your daily practice journey, where consistency meets smart preparation. These carefully selected questions are designed to sharpen your concepts, improve accuracy, and build the confidence you need for the final exam. Remember, NEET success isn’t about studying everything at once; it’s about mastering a little more every single day. So grab your notebook, stay focused, and let’s make today’s practice count!

PHYSICS

Q.1. A 1 kg block is placed on a rough horizontal surface and attached to a light spring. The block is pulled and released, executing horizontal oscillations with gradually decreasing amplitude. Which of the following best describes the energy changes during the motion?

A. Kinetic energy is dissipated, but potential energy of the spring is conserved

B. Potential energy of the spring is converted entirely into kinetic energy without loss

C. Mechanical energy remains constant while kinetic energy decreases

D. Total mechanical energy decreases due to work done against friction

Q.2. A metal rod of length $L$ and uniform cross-sectional area is heated uniformly so that its temperature increases by $\mathrm{\Delta }T$. Which statement correctly relates the change in length $\mathrm{\Delta }L$ to the original length, given the coefficient of linear expansion $\alpha$α?

A. $\mathrm{\Delta }L={\displaystyle \frac{L}{\alpha \mathrm{\Delta }T}}$

B. $\mathrm{\Delta }L=\alpha \mathrm{\Delta }T$

C. $\mathrm{\Delta }L=L\alpha$

D. $\mathrm{\Delta }L=L\alpha \mathrm{\Delta }T$

Q.3. A block of mass $m$ is moving with speed $v$ on a smooth horizontal surface and then compresses an ideal spring of spring constant $k$ until it momentarily comes to rest. What is the maximum compression $x_{\max }$ of the spring?

A. $x_{\max }=\sqrt{{\displaystyle \frac{mv}{k}}}$

B. $x_{\max }=\sqrt{{\displaystyle \frac{m{v}^2}{2k}}}$

C. $x_{\max }={\displaystyle \frac{mv}{k}}$

D. $x_{\max }={\displaystyle \frac{m{v}^2}{2k}}$

Q.4. Two thin lenses of focal lengths $+10\text{cm}$ and $-20\text{cm}$ are kept in contact. What is the effective focal length of the combination?

A. −6.67cm

B. −20cm

C. +20cm

D. +6.67cm

Q.5. A body of mass $2\text{kg}$ is moving with a velocity of $5{\text{m s}}^{-1}$ on a smooth horizontal surface. A constant force of $4\text{N}$ acts on it in the direction of motion for $5\text{s}$. What will be its final kinetic energy?

A. 130 J

B. 170 J

C. 50 J

D. 90 J

Read Also: Daily Practice Questions For NEET UG 2026 to score 650+ (DAY 18)

CHEMISTRY

Q.6. A pure sample of gas at constant temperature obeys Boyle’s law. If its volume is changed from 2.0L to 0.5L, which of the following statements about the pressure is most appropriate?

A. Pressure becomes half of the initial value

B. Pressure remains unchanged

C. Pressure becomes one-fourth of the initial value

D. Pressure becomes four times the initial value

Q.7. Which of the following aqueous solutions will have the highest boiling point, assuming ideal behavior and complete dissociation where applicable?

A. $0.25\text{mol}{\text{kg}}^{-1}$ calcium chloride $({\text{CaCl}}_2)$

B. $0.5\text{mol}{\text{kg}}^{-1}$ sodium chloride $(\text{NaCl})$

C. $0.75\text{mol}{\text{kg}}^{-1}$ urea $({\text{CH}}_4{\text{N}}_2\text{O})$

D. $0.5\text{mol}{\text{kg}}^{-1}$ glucose $({\text{C}}_6{\text{H}}_{12}{\text{O}}_6)$

Q.8. Which of the following species has both σ– and π-bonds in its Lewis structure and shows $s{p}^2$-hybridization at the central atom?

A. ${\text{BF}}_3$

B. ${\text{SO}}_2$

C. ${\text{CO}}_2$

D. ${\text{NH}}_3$

Q.9. Which of the following combinations represents an electrophile and a nucleophile, respectively?

A. ${\text{BF}}_3$ and ${\text{NH}}_3$

B. ${\text{Na}}^{+}$ and ${\text{Mg}}^{2+}$

C. ${\text{OH}}^{-}$ and ${\text{H}}^{+}$

D. ${\text{NO}}_2^{+}$ and ${\text{Cl}}^{+}$

Q.10. Which of the following statements best explains why graphite conducts electricity but diamond does not?

A. Graphite has delocalized electrons in $\pi$π-bonds, while diamond has localized $s{p}^3$-bonds

B. Graphite contains only σ-bonds, while diamond contains only π-bonds

C. Diamond has free electrons in $s{p}^2$-bonds, while graphite has no free electrons

D. Both graphite and diamond have delocalized electrons, but graphite has more layers

Read Also: Most Important Biology Diagram For NEET UG 2026 (Day 4)

BIOLOGY

Q.11. In a healthy human nephron, which of the following changes would directly decrease the glomerular filtration rate (GFR) the most?

A. Increased permeability of the filtration membrane in Bowman’s capsule

B. Constriction of afferent arteriole and dilation of efferent arteriole

C. Dilation of afferent arteriole and constriction of efferent arteriole

D. Increased systemic blood pressure with unchanged renal arteriolar tone

Q.12. Which of the following is the most direct structural adaptation in C4 plants that helps minimize photorespiration?

A. Presence of a large number of stomata on both surfaces of leaves

B. Thick cuticle on the leaf surface to reduce transpiration

C. Kranz anatomy with bundle sheath cells surrounding vascular bundles

D. High chlorophyll concentration in palisade mesophyll cells only

Q.13. In a dihybrid cross between two pea plants with genotype $AaBb\times AaBb$, where genes assort independently, what is the probability of obtaining offspring that are phenotypically dominant for one trait and recessive for the other?

A. 8/16

B. 6/16

C. 4/16

D. 3/16

Q.14. Which hormone primarily stimulates the conversion of glycogen to glucose in the liver during an acute stress response?

A. Insulin

B. Glucagon

C. Adrenaline (epinephrine)

D. Thyroxine

Q.15. Which of the following is the most likely consequence of prolonged deficiency of vitamin D in a growing child?

A. Beriberi, with neuropathy and cardiac symptoms

B. Scurvy, with bleeding gums and poor wound healing

C. Pellagra, with dermatitis, diarrhoea, and dementia

D. Rickets, with bowed legs and delayed bone ossification

Great job completing Day 19 of your NEET preparation! Every question you solve and every mistake you learn from, is taking you closer to that 650+ dream score. Stay consistent, trust the process, and keep challenging yourself daily, because small efforts done regularly create big results. We’ll be back tomorrow with a fresh set of questions to keep your momentum strong. Until then, revise smart, stay motivated, and remember: your NEET success story is already in the making.

ANSWERS & EXPLANATIONS

Ans.1. D. Total mechanical energy decreases due to work done against friction. In each half-cycle, as the spring pulls or pushes the block, friction opposes the motion, doing negative work. This reduces the maximum kinetic energy that the block can gain as well as the maximum potential energy stored in the spring at the turning points, leading to damped oscillations where the total mechanical energy falls step by step.

Ans. 2. D. $\mathrm{\Delta }L=L\alpha \mathrm{\Delta }T$ . This formula states that the change in length is directly proportional to the initial length $L$, the coefficient of linear expansion $\alpha$, and the temperature change $\mathrm{\Delta }T$. It matches both dimensional analysis and experimental observations of how metals expand upon heating.

Ans.3. B. $x_{\max }=\sqrt{{\displaystyle \frac{m{v}^2}{2k}}}$. This is obtained by equating the initial kinetic energy to the elastic potential energy at maximum compression and solving for $x_{\max }$.

Ans.4. C. +20cm. The calculations using ${\displaystyle \frac{1}{f}}={\displaystyle \frac{1}{f_1}}+{\displaystyle \frac{1}{f_2}}$  confirm this effective focal length for thin lenses in contact.

Ans.5. A. 130J. The proper method is to focus on either kinematics or the work-energy theorem, but they must be executed carefully.

Ans.6. D. Pressure becomes four times the initial value. As the volume decreases from $2.0\text{L}$ to 0.5L, the gas is compressed into a smaller space. The molecules strike the walls more frequently, raising the pressure such that $P_2=4P_1$. This aligns perfectly with Boyle’s law and explains the quantitative effect of a fourfold volume reduction on pressure in an isothermal process.

Ans.7. C. 0.75mol/kg urea. Although NaCl provides more particles per mole, its molality is lower than the combined effect of the higher molality of urea. For urea, $i=1$ but $m=0.75\text{mol}{\text{kg}}^{-1}$

Ans.8. B ${\text{SO}}_2$. In ${\text{SO}}_2$, the sulfur atom is $s{p}^2$-hybridized and forms $S=O$ double bonds that contain both σ– and π-components. This satisfies the condition that the central atom has $s{p}^2$-hybridization and the molecule contains both types of covalent bonds.

Ans. 9. A. ${\text{BF}}_3$ and ${\text{NH}}_3$. Here, ${\text{BF}}_3$ is the electrophile (Lewis acid), and ${\text{NH}}_3$ is the nucleophile (Lewis base), matching the required roles in the specified order.

Ans.10. A. Graphite has delocalized electrons in $\pi$π-bonds, while diamond has localized $s{p}^3$-bonds. This difference in bonding and electron delocalization is the key reason for graphite’s ability to conduct electricity and diamond’s inability to do so.

Ans.11. B. Constriction of afferent arteriole and dilation of efferent arteriole. When the afferent arteriole constricts, less blood reaches the glomerulus, reducing glomerular hydrostatic pressure. Simultaneously, dilation of the efferent arteriole allows blood to leave the glomerulus more easily, 

Ans.12. C. Kranz anatomy with bundle sheath cells surrounding vascular bundles. In C4 plants, specialized mesophyll cells initially fix ${\text{CO}}_2$ into a 4-carbon compound (like oxaloacetate) using phosphoenolpyruvate carboxylase, which has a high affinity for and no affinity for ${\text{O}}_2$. 

Ans.13. B. 6/16. In AaBb×AaBb with independent assortment, the phenotypic ratio is 9:3:3:1 . The class with dominant A and recessive b has 3/16, and the class with recessive a and dominant B also has 3/16.

Ans.14. C. Adrenaline (epinephrine). In an acute stress or “fight-or-flight” situation, adrenaline is released from the adrenal medulla. It binds to receptors in the liver and activates enzymes that catalyse glycogenolysis, the breakdown of glycogen to glucose-1-phosphate, which is then converted to glucose-6-phosphate and ultimately free glucose released into the blood. This rapid increase in blood glucose provides instant energy to muscles and other organs. 

Ans.15. D. Rickets, with bowed legs and delayed bone ossification. Lack of vitamin D impairs absorption and utilization of calcium and phosphate, compromising bone development in children and causing the clinical picture of rickets.

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