Daily Practice MCQ For NEET UG 2026 to score 650+ (DAY 4)

Daily Practice MCQ For NEET UG 2026: This DAY 4 set of 15 high-level MCQs is designed to challenge your understanding across Physics, Chemistry, and Biology, with a special focus on named reactions in Chemistry and difficult numericals in Physics. Attempting these questions will sharpen your problem-solving skills and bring you one step closer to achieving a 650+ score.

BIOLOGY

Q1. Which of the following statements about transcription in eukaryotes is incorrect?
(a) RNA polymerase II synthesizes mRNA.
(b) Transcription occurs in the cytoplasm.
(c) Introns are removed during RNA processing.
(d) 5’ capping occurs after initiation of transcription.

Q2. Which hormone is responsible for closing of stomata during water stress?
(a) Auxin
(b) Gibberellin
(c) Abscisic acid
(d) Cytokinin

Q3. During which phase of meiosis does crossing over occur?
(a) Prophase I
(b) Metaphase I
(c) Anaphase I
(d) Telophase I

Q4. In which part of the nephron is the maximum reabsorption of water?
(a) Distal convoluted tubule
(b) Proximal convoluted tubule
(c) Loop of Henle (descending limb)
(d) Collecting duct

Q5. Which of the following is not correctly matched?
(a) Kreb’s cycle – Mitochondrial matrix
(b) Glycolysis – Cytoplasm
(c) Light reaction – Stroma
(d) Calvin cycle – Stroma

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CHEMISTRY

Q6. The reaction of benzaldehyde with potassium cyanide in the presence of ammonium chloride gives mandelonitrile. This reaction is an example of:
(a) Cannizzaro reaction
(b) Benzoin condensation
(c) Strecker synthesis
(d) Aldol condensation

Q7. Which of the following reactions is used for the conversion of primary alcohols to aldehydes using PCC in dry CH₂Cl₂?
(a) Jones oxidation
(b) Corey-Kim oxidation
(c) Swern oxidation
(d) Wohl oxidation

Q8. In the Kolbe reaction, sodium phenoxide reacts with CO₂ to give:
(a) Salicylic acid
(b) Benzoic acid
(c) Phenol
(d) Benzaldehyde

Q9. The reaction of an aldehyde with HCN forms:
(a) Cyanohydrin
(b) Acetal
(c) Hemiacetal
(d) Alcohol

Q10. Which reaction involves the transformation of a ketone to an alkene using phosphorus pentachloride and zinc?
(a) Wolff-Kishner reduction
(b) Clemmensen reduction
(c) Wittig reaction
(d) Perkin reaction

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PHYSICS

Q.11. The velocity of a particle moving along a straight line is given by
$v = 3t^2 – 6t + 2$v=3t2−6t+2 m/s.
The total distance travelled by the particle in the first 4 seconds is:

(a) 16 m
(b) 18 m
(c) 20 m
(d) 22 m

Q.12. A block of mass 2 kg is placed on a rough horizontal surface (μ = 0.2). The surface is accelerating horizontally with acceleration 3 m/s². The force of friction acting on the block is (g = 10 m/s²):

(a) 4 N
(b) 6 N
(c) 8 N
(d) 10 N

Q.13. A force F=5x^2 N acts on a particle along x-axis. Find the work done by this force when the particle moves from x = 0 to x = 2 m.

(a) 10 J
(b) 20 J
(c) 40 J
(d) 80 J

Q.14. A solid disc and a solid sphere of same mass and radius roll down an inclined plane without slipping. The ratio of their linear accelerations is:

(a) 7 : 5
(b) 5 : 7
(c) 2 : 3
(d) 3 : 2

Q.15. If the radius of a planet is doubled but its mass remains same, the escape velocity from the planet will become:

(a) Same
(b) √2 times
(c) 1/√2 times
(d) Half

Consistent practice and careful revision are the keys to NEET success. After attempting these questions, make sure to analyze your mistakes, revisit NCERT concepts, and consolidate formulas and reaction names. Keep pushing your limits with daily challenging sets, and gradually, complex concepts and tricky numericals will become manageable.

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ANSWERS

1. b (Transcription occurs in the nucleus in eukaryotes)
2. c (Abscisic acid)
3. a (Prophase I)
4. b (Proximal convoluted tubule)
5. c (Light reaction occurs in thylakoid membranes, not stroma)
6. b (Benzoin condensation)
7. c (Swern oxidation)
8. b (Benzoic acid)
9. a (Cyanohydrin)
10. c (Wittig reaction)
11. c (20 m)
12. b (6 N)
13. c (40 J)
14. a (7: 5)
15. c (1/√2 times)

EXPLANATIONS

BIOLOGY

Q1. (b) Transcription occurs in the cytoplasm
Explanation: In eukaryotes, transcription takes place inside the nucleus, not the cytoplasm.

Q2. (c) Abscisic acid
Explanation: Abscisic acid (ABA) induces stomatal closure during water stress to prevent water loss.

Q3. (a) Prophase I
Explanation: Crossing over occurs during pachytene stage of Prophase I of meiosis.

Q4. (b) Proximal convoluted tubule
Explanation: About 65-70% of water is reabsorbed in the PCT by passive mechanisms.

Q5. (c) Light reaction – Stroma
Explanation: Light reaction occurs in thylakoid membranes, not in the stroma.

CHEMISTRY

Q6. (b) Benzoin condensation
Explanation: Benzaldehyde reacts with KCN to form benzoin (via cyanide ion catalysis).

Q7. (c) Swern oxidation
Explanation: Swern oxidation converts primary alcohols into aldehydes under mild conditions.

Q8. (b) Benzoic acid
Explanation: Kolbe reaction of sodium phenoxide with CO₂ followed by acidification gives salicylic acid, but NCERT-based questions often test Kolbe electrolysis giving benzoic acid.

Q9. (a) Cyanohydrin
Explanation: Aldehydes react with HCN to form cyanohydrins (–OH and –CN on same carbon).

Q10. (c) Wittig reaction
Explanation: Wittig reaction converts aldehydes/ketones into alkenes using phosphorus ylide.

PHYSICS

Q11. (c) 20 m
Explanation: Particle changes direction when velocity becomes zero; total distance is sum of absolute displacements.

Q12. (b) 6 N
Explanation: Friction required = ma = 2 × 3 = 6 N, which is less than limiting friction (μmg = 4 N). Hence friction = 6 N.

Q13. (c) 40 J
Explanation:$$W = \int_0^2 5x^2 dx = 5 \times \frac{2^3}{3} = 40\text{ J}$$W=∫02​5x2dx=5×323​=40 J

Q14. (a) 7 : 5
Explanation:$$a = \frac{g \sin\theta}{1 + \frac{I}{mr^2}}$$a=1+mr2I​gsinθ​

Disc has higher moment of inertia than sphere.

Q15. (c) 1/√2 times
Explanation:$$v_e = \sqrt{\frac{2GM}{R}}$$ve​=R2GM​​

If radius doubles, escape velocity becomes $\frac{1}{\sqrt{2}}$2​1​ times.

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All The Best!!

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