NEET 2021 (question paper code M1) had 200 questions in NEET720's bank: Physics 50, Chemistry 50, Botany 50 and Zoology 50. The 12 questions below are a fixed free sample with NEET720's explanations; the complete paper is in the app, where it can be sat as a timed mock with the real marking scheme.
Physics — NEET 2021 sample questions
NEET 2021 · Question 1
Two charged conducting spheres of radii R₁ and R₂ are connected by a wire. Find σ₁/σ₂.
- A.R₁/R₂
- B.R₂/R₁
- C.(R₁/R₂)²
- D.(R₂/R₁)²
Show answer and explanation
Answer: B. R₂/R₁
Connected conductors reach equal potential, so surface charge density varies inversely with radius.
Equal potentials give Q₁/R₁=Q₂/R₂, hence Q₁/Q₂=R₁/R₂. Since σ=Q/(4πR²), σ₁/σ₂=(Q₁/Q₂)(R₂²/R₁²)=R₂/R₁. Therefore option 2 is correct.
NEET 2021 · Question 2
A small ball of mass M and density d falls through glycerine of density d/2 and reaches terminal velocity. What is the viscous force then?
- A.Mg/2
- B.Mg
- C.3Mg/2
- D.2Mg
Show answer and explanation
Answer: A. Mg/2
At terminal speed, viscous drag balances weight minus buoyancy.
The volume of the ball is M/d. Buoyant force is (M/d)(d/2)g=Mg/2, so drag plus buoyancy must equal Mg. Thus viscous force is Mg−Mg/2=Mg/2, option 1.
NEET 2021 · Question 3
An infinite wire carries 5 A. An electron moves parallel to it at 10⁵ m/s, 20 cm away. Find magnetic force magnitude.
- A.4×10⁻²⁰ N
- B.8π×10⁻²⁰ N
- C.4π×10⁻²⁰ N
- D.8×10⁻²⁰ N
Show answer and explanation
Answer: D. 8×10⁻²⁰ N
Use B=μ₀I/(2πr) and F=evB.
At r=0.2 m, B=(4π×10⁻⁷×5)/(2π×0.2)=5×10⁻⁶ T. Then F=(1.6×10⁻¹⁹)(10⁵)(5×10⁻⁶)=8×10⁻²⁰ N. Hence option 4.
Chemistry — NEET 2021 sample questions
NEET 2021 · Question 51
What is the dihedral angle of the least stable conformer of ethane?
- A.120°
- B.180°
- C.60°
- D.0°
Show answer and explanation
Answer: D. 0°
The eclipsed ethane conformer is least stable and has 0° dihedral angle.
Staggered ethane minimizes torsional strain at 60°. Complete eclipse aligns C-H bonds with dihedral angle 0°, maximizing torsional strain. Option 4.
NEET 2021 · Question 52
Which statement about noble gases is incorrect?
- A.Sparingly soluble in water
- B.Very high melting/boiling points
- C.Weak dispersion forces
- D.Large positive electron-gain enthalpy
Show answer and explanation
Answer: B. Very high melting/boiling points
Noble gases have very low, not very high, melting and boiling points.
Their monatomic particles interact only through weak London forces. This makes boiling/melting points low. Therefore option 2 is the incorrect statement.
NEET 2021 · Question 53
Identify the major product of the organic reaction shown in the M1 paper.
- A.Original M1 product option 1 (visual/diagram-based)
- B.Original M1 product option 2 (visual/diagram-based)
- C.Original M1 product option 3 (visual/diagram-based)
- D.Original M1 product option 4 (visual/diagram-based)
Show answer and explanation
Answer: A. Original M1 product option 1 (visual/diagram-based)
Apply the dominant mechanistic/regiochemical pathway of the shown reaction.
The substrate and reagents favour the rearrangement/addition pathway represented in the first product. The competing structures either violate regiochemistry or retain a group that should react. Thus option 1.
Botany — NEET 2021 sample questions
NEET 2021 · Question 101
Which plant is monoecious?
- A.Papaya
- B.Chara
- C.Marchantia
- D.Cycas
Show answer and explanation
Answer: B. Chara
Chara bears male and female sex organs on the same plant.
Papaya, Marchantia and Cycas are commonly dioecious in the NCERT examples. Chara is monoecious, option 2. The official NTA M1 key places the answer at option 2.
NEET 2021 · Question 102
A mature angiosperm embryo sac is:
- A.8-nucleate,7-celled
- B.7-nucleate,8-celled
- C.7-nucleate,7-celled
- D.8-nucleate,8-celled
Show answer and explanation
Answer: A. 8-nucleate,7-celled
The typical Polygonum-type embryo sac is 8-nucleate but 7-celled.
The central cell contains two polar nuclei, while the egg apparatus and antipodals account for six other cells. Thus option 1. The official NTA M1 key places the answer at option 1.
NEET 2021 · Question 103
Gemmae are characteristic vegetative propagules in:
- A.Mosses
- B.Pteridophytes
- C.Some gymnosperms
- D.Some liverworts
Show answer and explanation
Answer: D. Some liverworts
Marchantia and other liverworts reproduce vegetatively through gemmae.
Gemma cups contain multicellular green propagules that detach and develop into new thalli. Hence option 4. The official NTA M1 key places the answer at option 4.
Zoology — NEET 2021 sample questions
NEET 2021 · Question 151
Identify the incorrect pair among alkaloid-codeine, toxin-abrin, lectin-concanavalin A, drug-ricin.
- A.Alkaloid—Codeine
- B.Toxin—Abrin
- C.Lectin—Concanavalin A
- D.Drug—Ricin
Show answer and explanation
Answer: D. Drug—Ricin
Ricin is a highly toxic lectin, not a therapeutic drug.
Codeine is an alkaloid, abrin is a toxin and concanavalin A is a lectin. Therefore option 4 is incorrect. The official NTA M1 key places the answer at option 4.
NEET 2021 · Question 152
Drosophila has 2n=8. How many chromosomes after S phase of interphase?
- A.8
- B.16
- C.4
- D.32
Show answer and explanation
Answer: A. 8
DNA content doubles in S phase, but chromosome number does not until chromatids separate.
Each of the 8 chromosomes becomes two sister chromatids joined at one centromere. Chromosome number remains 8. Option 1.
NEET 2021 · Question 153
Match A. Metamerism, B. Canal system, C. Comb plates, D. Cnidoblasts with I. Cnidaria, II. Ctenophora, III. Annelida, IV. Porifera.
- A.A-IV, B-III, C-I, D-II
- B.A-III, B-IV, C-I, D-II
- C.A-III, B-IV, C-II, D-I
- D.A-IV, B-I, C-II, D-III
Show answer and explanation
Answer: C. A-III, B-IV, C-II, D-I
Metamerism characterises annelids, the canal system poriferans, comb plates ctenophores and cnidoblasts cnidarians.
True metameric segmentation is a hallmark of Annelida, so A-III. Porifera possess a characteristic water canal system, B-IV, and Ctenophora move using eight rows of comb plates, C-II. Cnidaria possess stinging cnidoblasts/cnidocytes, D-I. Therefore option 3.
Sit the full NEET 2021 paper as a timed mock
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Questions about NEET 2021
How many questions were there in NEET 2021?＋
The NEET 2021 paper in NEET720's bank (code M1) has 200 questions: Physics 50, Chemistry 50, Botany 50 and Zoology 50. That year the paper carried 200 questions with internal choice, of which candidates attempted 180.
Where can I solve the full NEET 2021 paper?＋
Sign in to NEET720, open Previous Year Questions and choose 2021. You can practise question by question with instant explanations, or sit the whole paper as a timed mock with the real +4/−1 marking and a full analysis afterwards.
Are these the official NEET 2021 questions?＋
The questions and options reproduce the official NTA paper as published. Every explanation is NEET720's own; none is copied from any publisher or coaching institute. Questions that NTA declared bonus or withdrew are not shown as practice items.
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Questions and options reproduce the official NTA NEET 2021 paper. Explanations are written by NEET720. NEET720 is not affiliated with the National Testing Agency.