NEET 2025 (question paper code 45) 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 2025 sample questions
NEET 2025 · Question 2
A microscope has an objective of focal length 2 cm, eyepiece of focal length 4 cm and tube length 40 cm. If the distance of distinct vision is 25 cm, the magnification is:
- A.100
- B.125
- C.150
- D.250
Show answer and explanation
Answer: B. 125
For a compound microscope in normal adjustment, magnification is approximately (L/f₀)(D/fₑ).
For a compound microscope in normal adjustment, magnification is approximately (L/f₀)(D/fₑ). Substituting L=40 cm, f₀=2 cm, D=25 cm and fₑ=4 cm gives 20×6.25=125. Therefore option 2 is correct.
NEET 2025 · Question 3
An electron (mass 9×10⁻³¹ kg, charge magnitude 1.6×10⁻¹⁹ C) moving with speed c/100 is injected into a magnetic field B = 9×10⁻⁴ T perpendicular to its motion. A uniform electric field is applied along with B so that the electron is undeflected. Given c = 3×10⁸ m s⁻¹, choose the correct statement.
- A.E is perpendicular to B and |E| = 27×10⁴ V m⁻¹
- B.E is perpendicular to B and |E| = 27×10² V m⁻¹
- C.E is parallel to B and |E| = 27×10² V m⁻¹
- D.E is parallel to B and |E| = 27×10⁴ V m⁻¹
Show answer and explanation
Answer: B. E is perpendicular to B and |E| = 27×10² V m⁻¹
No deflection requires electric and magnetic forces to cancel: eE=evB, with E perpendicular to B and v.
No deflection requires electric and magnetic forces to cancel: eE=evB, with E perpendicular to B and v. Thus E=vB=(3×10⁶)(9×10⁻⁴)=2.7×10³ V m⁻¹=27×10² V m⁻¹. This is option 2.
NEET 2025 · Question 4
There are two inclined surfaces of equal length (ZL) and same angle of inclination 45° with the horizontal. One of them is rough and the other is perfectly smooth. A given body takes 2 times as much time to slide down on rough surface than on the smooth surface. The coefficient of kinetic friction (1z) between the object and the rough surface is close to (1) 0.25 (2) 0.40 () 0.5 (4) 0.75
- A.0.25
- B.0.40
- C.0.5
- D.0.75
Show answer and explanation
Answer: D. 0.75
For equal path length from rest, t∝1/√a.
For equal path length from rest, t∝1/√a. Since t_rough=2t_smooth, a_rough=a_smooth/4. With θ=45°, g(sinθ−μcosθ)=g sinθ/4, which gives μ=3/4=0.75, option 4.
Chemistry — NEET 2025 sample questions
NEET 2025 · Question 46
The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n= 2 + n=3 andn=4 + n=6 : transitions, respectively, is 1 1 (1) 36 (2) 16 | 1 Orn, a 4
- A.1/36
- B.1/16
- C.1/9
- D.1/4
Show answer and explanation
Answer: D. 1/4
Hydrogen transition energy is proportional to (1/n_i²−1/n_f²), while λ∝1/ΔE.
Hydrogen transition energy is proportional to (1/n_i²−1/n_f²), while λ∝1/ΔE. For 2→3 the factor is 5/36; for 4→6 it is 5/144, so λ₂₋₃/λ₄₋₆=(5/144)/(5/36)=1/4. Option 4.
NEET 2025 · Question 47
Which statements are true? A. Unlike Ga, which has a very low melting point, Cs also has a very low melting point. B. On Pauling scale, electronegativity values of N and Cl are not the same. C. Ar, K⁺, Cl⁻, Ca²⁺ are all isoelectronic species. D. The correct order of first-ionization enthalpies is Na < Mg < Al < Si. E. The atomic radius of Cs is greater than that of Li and Rb.
- A.A, B and E only
- B.C and E only
- C.C and D only
- D.A, C and E only
Show answer and explanation
Answer: B. C and E only
The isoelectronic set Ar, K⁺, Cl⁻ and Ca²⁺ is correct, and atomic radius increases down Group 1 so Cs is larger than Li/Rb.
The isoelectronic set Ar, K⁺, Cl⁻ and Ca²⁺ is correct, and atomic radius increases down Group 1 so Cs is larger than Li/Rb. The ionization-order statement containing Mg and Al is wrong because Al has lower first ionization enthalpy than Mg. Thus C and E are true: option 2.
NEET 2025 · Question 48
Match the ions with their group in classical qualitative cation analysis: A. Co²⁺, B. Mg²⁺, C. Pb²⁺, D. Al³⁺; I. Group-I, II. Group-III, III. Group-IV, IV. Group-VI.
- A.A-III, B-IV, C-II, D-I
- B.A-III, B-IV, C-I, D-II
- C.A-III, B-II, C-IV, D-I
- D.A-II, B-III, C-I, D-IV
Show answer and explanation
Answer: B. A-III, B-IV, C-I, D-II
In qualitative analysis, Pb²⁺ is Group I, Al³⁺ Group III, Co²⁺ Group IV and Mg²⁺ Group VI.
In qualitative analysis, Pb²⁺ is Group I, Al³⁺ Group III, Co²⁺ Group IV and Mg²⁺ Group VI. Therefore A-III, B-IV, C-I, D-II. Option 2.
Botany — NEET 2025 sample questions
NEET 2025 · Question 91
The complex II of mitochondrial electron transport chain is also known as
- A.Cytochrome be,
- B.Succinate dehydrogenase
- C.Cytochrome c oxidase
- D.NADH dehydrogenase
Show answer and explanation
Answer: B. Succinate dehydrogenase
Complex II of the mitochondrial electron-transport chain is succinate dehydrogenase.
Complex II of the mitochondrial electron-transport chain is succinate dehydrogenase. It oxidizes succinate to fumarate in the TCA cycle and transfers electrons through FAD/FADH₂ to ubiquinone. Therefore option 2.
NEET 2025 · Question 97
Epiphytes that are growing on a mango branch is an example of which of the following?
- A.Commensalism
- B.Mutualism
- C.Predation
- D.Amensalism
Show answer and explanation
Answer: A. Commensalism
An epiphyte gains support and better access to light by growing on a mango branch while the mango is neither helped nor harmed.
An epiphyte gains support and better access to light by growing on a mango branch while the mango is neither helped nor harmed. This +/0 interaction is commensalism. Option 1.
NEET 2025 · Question 99
Which one of the following is an example of ex-situ conservation?
- A.National Park
- B.Wildlife Sanctuary
- C.Zoos and botanical gardens
- D.Protected areas
Show answer and explanation
Answer: C. Zoos and botanical gardens
Zoos and botanical gardens maintain threatened organisms outside their natural habitats.
Zoos and botanical gardens maintain threatened organisms outside their natural habitats. That is ex-situ conservation, unlike national parks and wildlife sanctuaries which are in-situ. Option 3.
Zoology — NEET 2025 sample questions
NEET 2025 · Question 92
Polymerase chain reaction (PCR) amplifies DNA following the equation. (ly) N2 (2) 20 (3) 2n+1 (4) 2N2
- A.N²
- B.2ⁿ
- C.2n+1
- D.2N²
Show answer and explanation
Answer: B. 2ⁿ
Ideally, each PCR cycle doubles the amount of target DNA.
Ideally, each PCR cycle doubles the amount of target DNA. Starting from one target molecule, after n cycles the amplification is 2ⁿ. Hence option 2.
NEET 2025 · Question 93
What are the potential drawbacks in adoption of the IVF method? A. High fatality risk to mother, B. Expensive instruments and reagents, C. Husband-wife necessarily have to be donors, D. Less adoption of orphans, E. Not available in India, F. Possible that the early embryo does not survive.
- A.B, D and F only
- B.A, C and D only
- C.A, B, C and D only
- D.A, B, C, E and F only
Show answer and explanation
Answer: A. B, D and F only
IVF requires expensive equipment and reagents, an early embryo may fail to survive, and social adoption concerns can be listed as a drawback; it does not require spouses to be the gamete donors and is available in India.
IVF requires expensive equipment and reagents, an early embryo may fail to survive, and social adoption concerns can be listed as a drawback; it does not require spouses to be the gamete donors and is available in India. Thus the correct set is B, D and F, option 1. Therefore the correct choice is option 1.
NEET 2025 · Question 94
What is the name of the blood vessel that carries deoxygenated blood from the body to the heart in a frog ?
- A.Aorta
- B.Pulmonary artery
- C.Pulmonary vein
- D.Vena cava
Show answer and explanation
Answer: D. Vena cava
In a frog, systemic veins return deoxygenated blood to the sinus venosus/heart through the venae cavae.
In a frog, systemic veins return deoxygenated blood to the sinus venosus/heart through the venae cavae. The aorta carries blood away from the heart, while pulmonary vessels serve the lungs. Option 4.
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Questions about NEET 2025
How many questions were there in NEET 2025?＋
The NEET 2025 paper in NEET720's bank (code 45) has 180 questions: Physics 45, Chemistry 45, Botany 45 and Zoology 45.
Where can I solve the full NEET 2025 paper?＋
Sign in to NEET720, open Previous Year Questions and choose 2025. 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 2025 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 2025 paper. Explanations are written by NEET720. NEET720 is not affiliated with the National Testing Agency.