The NEET 2018 paper had 180 questions across Biology, Physics and Chemistry, marked +4 for a correct answer and −1 for a wrong one. This page shows what it contained, which chapters it drew on, and 10 of its questions with answers.
Sample questions from NEET 2018 with answers
A spread of 10 questions from the paper, chosen across the three subjects. The full paper is in the app.
Question 13
Physics · Ray Optics and Optical InstrumentsAn astronomical refracting telescope will have large angular magnification and high angular resolution, when it has an objective lens of
- A Small focal length and large diameter
- B Large focal length and small diameter
- C Small focal length and small diameter
- D Large focal length and large diameter
Answer: D. Large focal length and large diameter
Why: Angular magnification is f_o/f_e, so a large objective focal length helps. Resolving power grows with aperture diameter (limit 1.22λ/D), so a large diameter is also needed.
Question 41
Physics · Laws of MotionA moving block having mass m, collides with another stationary block having mass 4m. The lighter block comes to rest after collision. When the initial velocity of the lighter block is v, then the value of coefficient of restitution (e) will be
- A 0.5
- B 0.25
- C 0.4
- D 0.8
Answer: B. 0.25
Why: Momentum conservation gives mv = 4m·V, so the heavier block moves at V = v/4 while the lighter stops. Then e = (relative speed of separation)/(relative speed of approach) = (v/4)/v = 0.25.
Question 71
Biology · Neural Control and CoordinationThe transparent lens in the human eye is held in its place by
- A ligaments attached to the ciliary body
- B ligaments attached to the iris
- C smooth muscles attached to the ciliary body
- D smooth muscles attached to the iris
Answer: A. ligaments attached to the ciliary body
Why: The lens is suspended by suspensory ligaments (zonule fibres) attached to the ciliary body; the ciliary muscle alters their tension to change lens curvature.
Question 101
Biology · Transport in PlantsStomatal movement is not affected by
- A Temperature
- B Light
- C CO₂ concentration
- D O₂ concentration
Answer: D. O₂ concentration
Why: Guard cells respond to light, temperature and internal CO₂ level (and water status), but ambient O₂ concentration has no regulatory effect on stomatal opening, so O₂ concentration is the answer.
Question 113
Biology · Sexual Reproduction in Flowering PlantsWhich of the following has proved helpful in preserving pollen as fossils?
- A Pollenkitt
- B Cellulosic intine
- C Sporopollenin
- D Oil content
Answer: C. Sporopollenin
Why: The exine is made of sporopollenin, an extremely resistant polymer that withstands high temperature and acids, so pollen fossilises well.
Question 127
Biology · Biological ClassificationAfter karyogamy followed by meiosis, spores are produced exogenously in
- A Neurospora
- B Alternaria
- C Saccharomyces
- D Agaricus
Answer: D. Agaricus
Why: In Agaricus (a basidiomycete) karyogamy and meiosis occur in the basidium, and the four basidiospores are borne on the outside of it (exogenously). Neurospora and Saccharomyces form ascospores inside asci, and Alternaria is a deuteromycete lacking a sexual stage.
Question 131
Biology · Anatomy of Flowering PlantsCasparian strips occur in
- A Epidermis
- B Pericycle
- C Endodermis
- D Cortex
Answer: C. Endodermis
Why: Casparian strips are suberin deposits on the radial and tangential walls of endodermal cells. They force water and solutes to pass through the cell membrane rather than between cells.
Question 140
Chemistry · p-Block ElementsWhich of the following statements is not true for halogens?
- A All form monobasic oxyacids
- B All are oxidizing agents
- C Chlorine has the highest electron-gain enthalpy
- D All but fluorine show positive oxidation states
Answer: D. All but fluorine show positive oxidation states
Why: The key marks option 4 as the statement that is not true. As printed it also reads as true by usual textbook teaching (fluorine shows only the -1 state while chlorine, bromine and iodine show positive states), so treat this as a weak question and remember only that the keyed answer is 4.
Question 160
Chemistry · EquilibriumWhich one of the following conditions will favour maximum formation of the product in the reaction, A₂(g) + B₂(g) ⇌ X₂(g), ΔrH = –X kJ?
- A Low temperature and high pressure
- B Low temperature and low pressure
- C High temperature and low pressure
- D High temperature and high pressure
Answer: A. Low temperature and high pressure
Why: The forward reaction is exothermic and reduces moles of gas from 2 to 1, so low temperature and high pressure shift the equilibrium toward the product.
Question 168
Chemistry · Chemical KineticsThe correct difference between first and second order reactions is that
- A The rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
- B The half-life of a first-order reaction does not depend on [A]₀; the half-life of a second-order reaction does depend on [A]₀
- C The rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
- D A first-order reaction can catalyzed; a second-order reaction cannot be catalyzed
Answer: B. The half-life of a first-order reaction does not depend on [A]₀; the half-life of a second-order reaction does depend on [A]₀
Why: First-order half-life t½ = 0.693/k is independent of [A]₀, while second-order t½ = 1/(k[A]₀) depends on it; the other statements are false.
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