The NEET 2019 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 2019 with answers
A spread of 10 questions from the paper, chosen across the three subjects. The full paper is in the app.
Question 62
Biology · EvolutionIn a species, the weight of newborn ranges from 2 to 5 kg. 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 4.5 to 5 kg die. Which type of selection process is taking place?
- A Cyclical Selection
- B Directional Selection
- C Stabilizing Selection
- D Disruptive Selection
Answer: C. Stabilizing Selection
Why: Individuals near the average survive while both extremes are eliminated, which narrows variation around the mean; this is stabilizing selection.
Question 64
Biology · Environmental IssuesWhich of the following protocols did aim for reducing emission of chlorofluorocarbons into the atmosphere?
- A Geneva Protocol
- B Montreal Protocol
- C Kyoto Protocol
- D Gothenburg Protocol
Answer: B. Montreal Protocol
Why: The Montreal Protocol (1987) was the international treaty to control emission of ozone-depleting substances such as CFCs.
Question 73
Biology · Microbes in Human WelfareWhich of the following is a commercial blood cholesterol lowering agent?
- A Lipases
- B Cyclosporin A
- C Statin
- D Streptokinase
Answer: C. Statin
Why: Statins, produced by the yeast Monascus purpureus, inhibit the enzyme for cholesterol synthesis and so lower blood cholesterol.
Question 80
Biology · Human Health and DiseasesWhich of the following immune responses is responsible for rejection of kidney graft?
- A Cell-mediated immune response
- B Auto-immune response
- C Humoral immune response
- D Inflammatory immune response
Answer: A. Cell-mediated immune response
Why: Graft rejection is carried out by T-lymphocytes, i.e. the cell-mediated immune response.
Question 89
Biology · Excretory Products and Their EliminationWhich of the following factors is responsible for the formation of concentrated urine?
- A Hydrostatic pressure during glomerular filtration
- B Low levels of antidiuretic hormone
- C Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
- D Secretion of erythropoietin by Juxtaglomerular complex
Answer: C. Maintaining hyperosmolarity towards inner medullary interstitium in the kidneys.
Why: The osmotic gradient built by the counter-current mechanism (increasing interstitial hyperosmolarity toward the inner medulla) lets water be drawn out of the collecting duct, giving concentrated urine.
Question 91
Physics · Motion in a Straight LineWhen an object is shot from the bottom of a long smooth inclined plane kept at an angle 60° with horizontal, it can travel a distance x₁ along the plane. But when the inclination is decreased to 30° and the same object is shot with the same velocity, it can travel x₂ distance. Then x₁ : x₂ will be:
- A 1 : 2√3
- B 1 : √2
- C √2 : 1
- D 1 : √3
Answer: D. 1 : √3
Why: Deceleration along the plane is g sinθ, so x = u²/(2g sinθ) and x₁/x₂ = sin30°/sin60° = 1/√3.
Question 115
Physics · Electromagnetic WavesWhich colour of the light has the longest wavelength?
- A Violet
- B Red
- C Blue
- D Green
Answer: B. Red
Why: Within visible light, wavelength increases from violet to red, so red has the longest wavelength.
Question 141
Chemistry · Solid StateA compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is :
- A C₄A₃
- B C₂A₃
- C C₃A₂
- D C₃A₄
Answer: D. C₃A₄
Why: In hcp, the number of octahedral voids equals the number of anions (N). Cations fill 0.75N, so C:A = 0.75:1 = 3:4, giving C₃A₄.
Question 150
Chemistry · EquilibriumConjugate base for Brönsted acids H₂O and HF are :
- A H₃O⁺ and H₂F⁺, respectively
- B OH⁻ and H₂F⁺, respectively
- C H₃O⁺ and F⁻, respectively
- D OH⁻ and F⁻, respectively
Answer: D. OH⁻ and F⁻, respectively
Why: A conjugate base is formed by losing one proton: H₂O loses H⁺ to give OH⁻, and HF loses H⁺ to give F⁻.
Question 170
Chemistry · Chemical BondingWhich of the following diatomic molecular species has only π bonds according to Molecular Orbital Theory?
- A Be₂
- B O₂
- C N₂
- D C₂
Answer: D. C₂
Why: C₂ has 12 electrons with configuration up to π2p⁴ filled and σ2p empty, so both bonds of its double bond are π bonds. Be₂ has no net bond, and O₂ and N₂ contain a σ bond.
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