NEET 2020 (question paper code E1) had 180 questions in NEET720's bank: Physics 45, Chemistry 45, Botany 45 and Zoology 45. 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 2020 sample questions
NEET 2020 · Question 136
For which species is the simple Bohr model not applicable?
- A.H atom
- B.He⁺
- C.Deuterium atom
- D.Ne⁺
Show answer and explanation
Answer: D. Ne⁺
Bohr's hydrogenic model applies to one-electron species.
Bohr's hydrogenic model applies to one-electron species. Ne⁺ still has nine electrons, so electron-electron interactions make the model invalid. Therefore the correct result is Ne⁺. This follows from the stated physical relation and the numerical or sign substitution above.
NEET 2020 · Question 137
In an electromagnetic wave, how do electric- and magnetic-field components contribute to total intensity/energy?
- A.Unequal in ratio c:1
- B.Equally
- C.1:c
- D.1:c²
Show answer and explanation
Answer: B. Equally
Electric and magnetic energy densities in a plane electromagnetic wave are equal, so their contributions to intensity are equal.
Electric and magnetic energy densities in a plane electromagnetic wave are equal, so their contributions to intensity are equal. Therefore the correct result is Equally. This follows from the stated physical relation and the numerical or sign substitution above.
NEET 2020 · Question 138
For a normal transparent dielectric interface from air, Brewster angle must lie in which range?
- A.0°–30°
- B.30°–45°
- C.45°–90°
- D.Exactly 90°
Show answer and explanation
Answer: C. 45°–90°
Brewster's law tan i_B=n₂/n₁.
Brewster's law tan i_B=n₂/n₁. For a dielectric denser than air, the ratio is >1, so i_B>45° but <90°. Therefore the correct result is 45°–90°. This follows from the stated physical relation and the numerical or sign substitution above.
Chemistry — NEET 2020 sample questions
NEET 2020 · Question 91
Which diatomic molecule is not stable/existent under ordinary molecular-orbital description?
- A.He₂
- B.Li₂
- C.C₂
- D.O₂
Show answer and explanation
Answer: A. He₂
He₂ would have equal bonding and antibonding electrons, giving bond order zero, so it is not a stable molecule.
He₂ would have equal bonding and antibonding electrons, giving bond order zero, so it is not a stable molecule. Therefore the correct result is He₂. The remaining choices conflict with the relevant reaction, bonding, equilibrium or periodic-property rule.
NEET 2020 · Question 92
Find solubility of Ni(OH)₂ in 0.1 M NaOH if Ksp=2×10⁻¹⁵.
- A.2×10⁻¹³ M
- B.2×10⁻⁸ M
- C.1×10⁻¹³ M
- D.1×10⁸ M
Show answer and explanation
Answer: A. 2×10⁻¹³ M
Ksp=[Ni²⁺][OH⁻]².
Ksp=[Ni²⁺][OH⁻]². With [OH⁻]≈0.1 M, solubility s=2×10⁻¹⁵/(0.1)²=2×10⁻¹³ M. Therefore the correct result is 2×10⁻¹³ M. The remaining choices conflict with the relevant reaction, bonding, equilibrium or periodic-property rule.
NEET 2020 · Question 93
Which set of statements is correct? A CO₂ is used as a refrigerant; B C₆₀ has twelve 6-membered and twenty 5-membered rings; C ZSM-5 converts alcohols to gasoline; D CO is colourless and odourless.
- A.A,B,C
- B.A and C
- C.B and C
- D.A, C and D
Show answer and explanation
Answer: D. A, C and D
Dry ice is used as a refrigerant, ZSM-5 catalyses conversion of alcohols to gasoline, and CO is colourless/odourless.
Dry ice is used as a refrigerant, ZSM-5 catalyses conversion of alcohols to gasoline, and CO is colourless/odourless. The C₆₀ ring-count statement is reversed: it has 12 pentagons and 20 hexagons. Therefore the correct result is A, C and D. The remaining choices conflict with the relevant reaction, bonding, equilibrium or periodic-property rule.
Botany — NEET 2020 sample questions
NEET 2020 · Question 1
Which item is NOT an attribute used to describe a population?
- A.Sex ratio
- B.Natality
- C.Mortality
- D.Species interaction
Show answer and explanation
Answer: D. Species interaction
Sex ratio, natality and mortality are population attributes.
Sex ratio, natality and mortality are population attributes. Species interaction describes relationships between populations/species rather than a property of one population. Therefore the correct result is Species interaction. The remaining choices describe a different biological structure, process, organism or relationship.
NEET 2020 · Question 2
During which phase of a typical sigmoid growth curve is growth rate maximum?
- A.Log/exponential phase
- B.Lag phase
- C.Senescence
- D.Dormancy
Show answer and explanation
Answer: A. Log/exponential phase
The exponential or log phase has the highest relative growth rate because cells are actively dividing and resources are not yet limiting.
The exponential or log phase has the highest relative growth rate because cells are actively dividing and resources are not yet limiting. Therefore the correct result is Log/exponential phase. The remaining choices describe a different biological structure, process, organism or relationship.
NEET 2020 · Question 3
Roots arising from the base of the stem are called:
- A.Fibrous roots
- B.Primary roots
- C.Prop roots
- D.Lateral roots
Show answer and explanation
Answer: A. Fibrous roots
Fibrous/adventitious roots commonly arise from the stem base, especially in monocots.
Fibrous/adventitious roots commonly arise from the stem base, especially in monocots. Primary roots arise from the radicle and lateral roots branch from existing roots. Therefore the correct result is Fibrous roots. The remaining choices describe a different biological structure, process, organism or relationship.
Zoology — NEET 2020 sample questions
NEET 2020 · Question 4
Match disease with causative organism: typhoid, pneumonia, filariasis and malaria.
- A.Typhoid–Wuchereria; pneumonia–Salmonella; filariasis–Plasmodium; malaria–Haemophilus
- B.Typhoid–Salmonella; pneumonia–Haemophilus; filariasis–Wuchereria; malaria–Plasmodium
- C.Typhoid–Plasmodium; pneumonia–Wuchereria; filariasis–Salmonella; malaria–Haemophilus
- D.Typhoid–Haemophilus; pneumonia–Wuchereria; filariasis–Plasmodium; malaria–Salmonella
Show answer and explanation
Answer: B. Typhoid–Salmonella; pneumonia–Haemophilus; filariasis–Wuchereria; malaria–Plasmodium
Typhoid is caused by Salmonella typhi, bacterial pneumonia may be caused by Haemophilus, filariasis by Wuchereria and malaria by Plasmodium.
Typhoid is caused by Salmonella typhi, bacterial pneumonia may be caused by Haemophilus, filariasis by Wuchereria and malaria by Plasmodium. Therefore the correct result is Typhoid–Salmonella; pneumonia–Haemophilus; filariasis–Wuchereria; malaria–Plasmodium. The remaining choices describe a different biological structure, process, organism or relationship.
NEET 2020 · Question 5
Which assisted-reproduction techniques involve embryo transfer to the female reproductive tract?
- A.ZIFT and IUT
- B.GIFT and ZIFT
- C.ICSI and ZIFT
- D.GIFT and ICSI
Show answer and explanation
Answer: A. ZIFT and IUT
ZIFT transfers an early embryo/zygote into the fallopian tube, whereas IUT transfers a later embryo to the uterus.
ZIFT transfers an early embryo/zygote into the fallopian tube, whereas IUT transfers a later embryo to the uterus. Both are embryo-transfer procedures. Therefore the correct result is ZIFT and IUT. The remaining choices describe a different biological structure, process, organism or relationship.
NEET 2020 · Question 6
Which statement about the ABO blood-group gene I is wrong?
- A.The gene has three alleles
- B.An individual carries only two of the alleles
- C.Iᴬ and Iᴮ together produce the same sugar antigen
- D.Allele i does not produce A or B antigen
Show answer and explanation
Answer: C. Iᴬ and Iᴮ together produce the same sugar antigen
Iᴬ and Iᴮ are codominant but specify different surface sugars/antigens, A and B.
Iᴬ and Iᴮ are codominant but specify different surface sugars/antigens, A and B. They do not produce the same sugar. Therefore the correct result is Iᴬ and Iᴮ together produce the same sugar antigen. The remaining choices describe a different biological structure, process, organism or relationship.
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Questions about NEET 2020
How many questions were there in NEET 2020?＋
The NEET 2020 paper in NEET720's bank (code E1) has 180 questions: Physics 45, Chemistry 45, Botany 45 and Zoology 45.
Where can I solve the full NEET 2020 paper?＋
Sign in to NEET720, open Previous Year Questions and choose 2020. 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 2020 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 2020 paper. Explanations are written by NEET720. NEET720 is not affiliated with the National Testing Agency.