NEET Exam 2025 : Most Important MCQs with Answers - Must-Do Before Exam

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Get exam-ready with our NEET 2025 Last Hour Booster! This guide features the most important MCQs with detailed answers to sharpen your revision.

In this article, NEET 2025 important questions are presented for NEET aspirants 2025. The set of important questions presented in this article focuses on providing NEET 2025 aspirants with all the important questions and answers so that they can practice and perform well in their exams going forward.

👉 Read Also - NEET 2025 Physics: Most Important MCQs with Answers

Below are the most important questions from the subjects - Physics, Chemistry and Biology - to help students streamline their revision process and boost their readiness for the NEET exam.

NEET 2025 Last Hour Booster: Most Important MCQs with Answers

1. Which hormone regulates sodium reabsorption in kidneys?
A) Aldosterone
B) Insulin
C) Thyroxine
D) Adrenaline

Answer - A) Aldosterone

2. Which type of bond is present in a diatomic oxygen molecule (O₂)?
A) Single covalent
B) Double covalent
C) Triple covalent
D) Ionic

Answer - B) Double covalent

3. What is the unit of magnetic flux?
A) Tesla
B) Weber
C) Henry
D) Ohm

Answer - B) Weber

👉 Read Also - NEET Physics 2025: Most Expected Questions with Solution

4. Which part of the nephron is mainly responsible for selective reabsorption?
A) Bowman’s capsule
B) Proximal convoluted tubule
C) Loop of Henle
D) Collecting duct

Answer - B) Proximal convoluted tubule

5. What is the hybridization of carbon in methane (CH₄)?
A) sp
B) sp²
C) sp³
D) sp³d

Answer - C) sp³

6. The energy required to remove an electron from a neutral isolated gaseous atom is called:
A) Electron affinity
B) Ionization energy
C) Electronegativity
D) Lattice energy

Answer - B) Ionization energy

7. Which law is used to explain the working of a transformer?
A) Coulomb’s law
B) Faraday’s law
C) Ohm’s law
D) Ampere’s law

Answer - B) Faraday’s law

8. Which phylum includes starfish?
A) Mollusca
B) Echinodermata
C) Arthropoda
D) Annelida

Answer - B) Echinodermata

9. The rate of reaction doubles when the temperature increases by about:
A) 5°C
B) 10°C
C) 15°C
D) 20°C

Answer - B) 10°C

10. The lens used in a simple microscope is:
A) Concave
B) Convex
C) Plano-concave
D) Cylindrical

Answer - B) Convex

11. Which enzyme converts glucose to glucose-6-phosphate?
A) Amylase
B) Glucokinase
C) Lipase
D) Maltase

Answer - B) Glucokinase

12. The number of ATP molecules produced from one molecule of glucose during aerobic respiration is:
A) 2
B) 18
C) 36
D) 38

Answer - D) 38

13. What is the molecular geometry of water (H₂O)?
A) Linear
B) Trigonal planar
C) Bent
D) Tetrahedral

Answer - C) Bent

14. What is the speed of light in a vacuum?
A) 3×10⁸ m/s
B) 2.2×10⁸ m/s
C) 3×10⁶ m/s
D) 9.8×10⁸ m/s

Answer - A) 3×10⁸ m/s

15. Which structure in a plant is responsible for transpiration?
A) Phloem
B) Stomata
C) Xylem
D) Root hairs

Answer - B) Stomata

16. The main nitrogenous waste in humans is:
A) Ammonia
B) Urea
C) Uric acid
D) Creatinine

Answer - B) Urea

17. The product of photosynthesis is:
A) Glucose
B) Oxygen
C) Both A and B
D) Carbon dioxide

Answer - C) Both A and B

18. The IUPAC name of CH₃-CH₂-COOH is:
A) Acetic acid
B) Propanoic acid
C) Butanoic acid
D) Ethanoic acid

Answer - B) Propanoic acid

19. Which gland secretes insulin?
A) Adrenal
B) Thyroid
C) Pituitary
D) Pancreas

Answer - D) Pancreas

20. The SI unit of power is:
A) Joule
B) Watt
C) Newton
D) Ampere

Answer - B) Watt

21. The charge of an electron is:
A) +1.6×10⁻¹⁹ C
B) –1.6×10⁻¹⁹ C
C) +1.6×10⁻¹⁸ C
D) –1.6×10⁻¹⁸ C

Answer - B) –1.6×10⁻¹⁹ C

22. The largest part of the human brain is:
A) Cerebellum
B) Cerebrum
C) Medulla
D) Thalamus

Answer - B) Cerebrum

23. The formula of washing soda is:
A) NaHCO₃
B) Na₂CO₃
C) Na₂CO₃·10H₂O
D) NaOH

Answer - C) Na₂CO₃·10H₂O

24. Which planet is known as the red planet?
A) Earth
B) Mars
C) Jupiter
D) Venus

Answer - B) Mars

25. Which vitamin helps in blood clotting?
A) A
B) B
C) K
D) D

Answer - C) K

26. What type of mirror is used in vehicle headlights?
A) Convex
B) Concave
C) Plane
D) Cylindrical

Answer - B) Concave

27. The backbone of DNA is made up of:
A) Ribose and phosphate
B) Deoxyribose and phosphate
C) Nitrogenous bases
D) Ribose and nitrogenous bases

Answer - B) Deoxyribose and phosphate

28. The oxidation number of nitrogen in NH₃ is:
A) +3
B) –3
C) 0
D) +1

Answer - B) –3

29. What is the normal pH of human blood?
A) 6.8
B) 7.4
C) 7.0
D) 7.8

Answer - B) 7.4

30. Name the law: PV = constant.
A) Boyle’s law
B) Charles’s law
C) Gay-Lussac’s law
D) Avogadro’s law

Answer - A) Boyle’s law

31. Which structure connects muscles to bones?
A) Ligaments
B) Tendons
C) Cartilage
D) Synapse

Answer - B) Tendons

32. Which gas is responsible for the greenhouse effect?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Neon

Answer - C) Carbon dioxide

33. The basic unit of heredity is:
A) DNA
B) Chromosome
C) Gene
D) Nucleus

Answer - C) Gene

34. What is Avogadro’s number?
A) 3.02×10²³
B) 6.02×10²³
C) 6.02×10²²
D) 3.02×10²²

Answer - B) 6.02×10²³

35. Which instrument measures electric current?
A) Voltmeter
B) Ammeter
C) Ohmmeter
D) Galvanometer

Answer - B) Ammeter

36. Which disease is caused by a deficiency of iodine?
A) Rickets
B) Goitre
C) Scurvy
D) Beriberi

Answer - B) Goitre

37. In photosynthesis, light energy is converted into:
A) Electrical energy
B) Mechanical energy
C) Chemical energy
D) Heat energy

Answer - C) Chemical energy

38. The molecular formula of benzene is:
A) C₅H₆
B) C₆H₆
C) C₇H₈
D) C₈H₁₀

Answer - B) C₆H₆

39. The largest artery in the human body is:
A) Pulmonary vein
B) Aorta
C) Coronary artery
D) Vena cava

Answer - B) Aorta

40. What type of reaction is: Zn + H₂SO₄ → ZnSO₄ + H₂?
A) Decomposition
B) Displacement
C) Double displacement
D) Combination

Answer - B) Displacement

41. The father of modern periodic table is:
A) Newlands
B) Mendeleev
C) Moseley
D) Dalton

Answer - B) Mendeleev

42. Which of the following is an amphibian?
A) Snake
B) Frog
C) Crocodile
D) Pigeon

Answer - B) Frog

43. Which process converts nitrogen gas into ammonia?
A) Nitrification
B) Denitrification
C) Nitrogen fixation
D) Ammonification

Answer - C) Nitrogen fixation

44. The order of draw in blood collection begins with which tube?
A) Red
B) Yellow
C) Blue
D) Purple

Answer - B) Yellow

45. Which organelle is known as the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Chloroplast

Answer - C) Mitochondria

46. The number of neutrons in carbon-14 is:
A) 6
B) 8
C) 14
D) 12

Answer - B) 8

47. Which rule determines the direction of induced current?
A) Fleming’s right-hand rule
B) Fleming’s left-hand rule
C) Lenz’s law
D) Ohm’s law

Answer - C) Lenz’s law

48. What is the main constituent of biogas?
A) Ethane
B) Methane
C) Propane
D) Butane

Answer - B) Methane

49. The chemical formula of gypsum is:
A) CaCO₃
B) CaSO₄
C) CaSO₄·2H₂O
D) Ca(OH)₂

Answer - C) CaSO₄·2H₂O

50. Which blood group is a universal donor?
A) A
B) B
C) AB
D) O

Answer - D) O

NEET Study Materials 2025

NEET Study Materials 2025
NEET Full Study Material	NEET Mock Test
NEET Previous Year Question Paper	NEET Revision Notes for Chemistry
NEET Revision Notes for Physics	NEET Revision Notes for Biology
NEET Mock Test Series 2025