The NEET 2020 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.
| Exam | NEET 2020, Set E1 |
|---|---|
| Questions | 180 (90 Biology, 45 Physics, 45 Chemistry) |
| Duration | 3 hours |
| Marking | +4 for a correct answer, −1 for a wrong answer |
| How many to answer | All 180 questions are compulsory. |
All questions, solutions and the All-India rank for this paper are in the app.
Questions are counted by the chapter they test. The chapters that carried the most were Biotechnology: Principles and Processes (6), Biomolecules (6), Current Electricity (5). Use the counts to see where this paper put its weight, and click a chapter for practice questions.
A spread of 10 questions from the paper, chosen across the three subjects. The full paper is in the app.
The specific palindromic sequence which is recognized by EcoRI is
Answer: A. 5′-GAATTC-3′ / 3′-CTTAAG-5′
Why: EcoRI recognises the palindrome 5′-GAATTC-3′ (reads the same 5′→3′ on both strands) and cuts between G and A. GGATCC is the BamHI site.
Identify the wrong statement with regard to Restriction Enzymes.
Answer: D. Sticky ends can be joined by using DNA ligases.
Why: The official NTA final key is option 4. Note: by NCERT, sticky ends are joined by DNA ligase, so option 4 reads as a correct statement and this question is generally regarded as debatable; the key is kept as official.
Floridean starch has structure similar to
Answer: B. Amylopectin and glycogen
Why: Floridean starch, the food reserve of red algae, is highly branched like amylopectin and glycogen, so option 2.
Which of the following hormone levels will cause release of ovum (ovulation) from the graffian follicle?
Answer: A. High concentration of Estrogen
Why: Rising estrogen from the mature follicle triggers a mid-cycle LH surge that causes the Graafian follicle to rupture and release the ovum, so high estrogen (option 1).
Experimental verification of the chromosomal theory of inheritance was done by
Answer: D. Morgan
Why: Sutton and Boveri proposed the chromosomal theory, but Thomas Hunt Morgan verified it experimentally with his Drosophila work on linkage and sex-linked inheritance.
A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of ?
Answer: D. Hyperconjugation
Why: The tertiary cation has more α C–H bonds (9 versus 5) available for hyperconjugation with the empty p orbital, which stabilises it more. Answer: option 4.
Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?
Answer: A. SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻
Why: In the spectrochemical series the order is SCN⁻ < F⁻ < C₂O₄²⁻ < CN⁻ (cyanide being a very strong field ligand). Answer: option 1.
Which one of the followings has maximum number of atoms ?
Answer: D. 1 g of Li(s) [Atomic mass of Li = 7]
Why: For equal mass the number of atoms is mass/atomic mass × Nₐ (×2 for O₂ molecules); 1 g Li gives 1/7 mol of atoms, more than Ag (1/108), Mg (1/24) or O (1/16), so option 4.
A charged particle having drift velocity of 7.5 × 10⁻⁴ m s⁻¹ in an electric field of 3 × 10⁻¹⁰ V m⁻¹, has a mobility in m² V⁻¹ s⁻¹ of :
Answer: B. 2.5 × 10⁶
Why: Mobility μ = v_d/E = 7.5 × 10⁻⁴ / 3 × 10⁻¹⁰ = 2.5 × 10⁶ m² V⁻¹ s⁻¹.
A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is :
Answer: C. 10.0 g
Why: Height h ∝ 1/r, mass = ρπr²h ∝ r. Doubling the radius doubles the mass to 10 g (equivalently, the supported weight equals the surface-tension force 2πrT cosθ, which is proportional to r).
The NEET 2020 paper (Set E1) in our collection has 180 questions: 90 in Biology, 45 in Physics and 45 in Chemistry. All 180 questions are compulsory.
Each correct answer earns 4 marks and each wrong answer loses 1 mark. An unanswered question scores nothing.
The chapters that carried the most questions were Biotechnology: Principles and Processes (6), Biomolecules (6), Current Electricity (5).
Yes. Open the NEET 2020 paper in the NeetVictory app, sit it under the real timing and marking, and see where you rank among students who have sat the same paper. Previous year papers are part of NeetVictory Pro.
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