Best MDCAT Practice Quiz 2020–2025 | 50 Most Repeated MCQs with Answers

MDCAT Common Practice Quiz – 50 MCQs with Answers

This post contains 50 fully verified MDCAT-style MCQs based on common concepts. Each question has four options and a clearly marked correct answer.

                  

                                                                

                                       

   

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1. The basic unit of life is:

A) Atom
B) Molecule
C) Cell
D) Tissue

Correct Answer: C

2. DNA is present in:

A) Cytoplasm
B) Nucleus
C) Ribosome
D) Cell wall

Correct Answer: B

3. Photosynthesis occurs in:

A) Root
B) Stem
C) Leaf
D) Flower

Correct Answer: C

4. Powerhouse of the cell is:

A) Ribosome
B) Mitochondria
C) Nucleus
D) Lysosome

Correct Answer: B

5. Enzyme that digests starch:

A) Pepsin
B) Amylase
C) Lipase
D) Trypsin

Correct Answer: B

6. Universal blood donor is:

A) A+
B) AB+
C) O−
D) O+

Correct Answer: C

7. Human heart has how many chambers?

A) 2
B) 3
C) 4
D) 5

Correct Answer: C

8. Gas required for respiration:

A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Hydrogen

Correct Answer: B

9. Functional unit of kidney is:

A) Neuron
B) Nephron
C) Alveolus
D) Axon

Correct Answer: B

10. Vitamin C deficiency causes:

A) Rickets
B) Scurvy
C) Beriberi
D) Night blindness

Correct Answer: B

11. pH of pure water is:

A) 5
B) 6
C) 7
D) 8

Correct Answer: C

12. Atomic number represents number of:

A) Neutrons
B) Protons
C) Electrons + Neutrons
D) Mass units

Correct Answer: B

13. H₂O is an example of:

A) Element
B) Mixture
C) Compound
D) Solution

Correct Answer: C

14. Noble gas among following is:

A) Oxygen
B) Nitrogen
C) Helium
D) Hydrogen

Correct Answer: C

15. Avogadro number is:

A) 6.02 × 10²³
B) 3 × 10⁸
C) 9.8
D) 1.6 × 10⁻¹⁹

Correct Answer: A

16. SI unit of force is:

A) Joule
B) Watt
C) Newton
D) Pascal

Correct Answer: C

17. Speed of light in vacuum is:

A) 3 × 10⁶ m/s
B) 3 × 10⁸ m/s
C) 3 × 10⁵ m/s
D) 3 × 10³ m/s

Correct Answer: B

18. Formula of force is:

A) m/v
B) m × a
C) v × t
D) m × v

Correct Answer: B

19. SI unit of electric current is:

A) Volt
B) Ohm
C) Ampere
D) Watt

Correct Answer: C

20. Sound cannot travel in:

A) Solid
B) Liquid
C) Gas
D) Vacuum

Correct Answer: D

21. Unit of work is:

A) Newton
B) Joule
C) Watt
D) Pascal

Correct Answer: B

22. Acceleration due to gravity is:

A) 9.8 m/s²
B) 8.9 m/s²
C) 10 m/s²
D) 9.2 m/s²

Correct Answer: A

23. Lens used to correct myopia:

A) Convex
B) Concave
C) Cylindrical
D) Plane

Correct Answer: B

24. Boiling point of water is:

A) 50°C
B) 0°C
C) 100°C
D) 150°C

Correct Answer: C

25. Water freezes at:

A) 100°C
B) 50°C
C) 0°C
D) −10°C

Correct Answer: C

26. Normal human body temperature is:

A) 35°C
B) 36°C
C) 37°C
D) 38°C

Correct Answer: C

27. Brain is part of:

A) Digestive system
B) Nervous system
C) Respiratory system
D) Circulatory system

Correct Answer: B

28. Synonym of Happy:

A) Sad
B) Angry
C) Joyful
D) Weak

Correct Answer: C

29. Opposite of Ancient:

A) Old
B) Modern
C) Past
D) Antique

Correct Answer: B

30. Correct sentence:

A) He go to school
B) He goes to school
C) He going school
D) He gone school

Correct Answer: B

31. Plural of child:

A) Childs
B) Childrens
C) Children
D) Childer

Correct Answer: C

32. 2, 4, 6, 8, ?

A) 9
B) 10
C) 11
D) 12

Correct Answer: B

33. Odd one out:

A) Heart
B) Brain
C) Liver
D) Leaf

Correct Answer: D

34. Main source of energy on Earth:

A) Moon
B) Sun
C) Wind
D) Water

Correct Answer: B

35. Blood carries oxygen with help of:

A) Plasma
B) Hemoglobin
C) Platelets
D) WBCs

Correct Answer: B

36. Smallest bone in human body:

A) Femur
B) Stapes
C) Tibia
D) Radius

Correct Answer: B

37. Largest organ of human body:

A) Liver
B) Brain
C) Skin
D) Heart

Correct Answer: C

38. Blood pH is approximately:

A) 6.8
B) 7.0
C) 7.4
D) 8.0

Correct Answer: C

39. Gas released during photosynthesis:

A) CO₂
B) Oxygen
C) Nitrogen
D) Hydrogen

Correct Answer: B

40. Number of chromosomes in humans:

A) 44
B) 46
C) 48
D) 23

Correct Answer: B

41. Unit of power:

A) Joule
B) Watt
C) Newton
D) Pascal

Correct Answer: B

42. SI unit of pressure:

A) Pascal
B) Joule
C) Watt
D) Newton

Correct Answer: A

43. Lens used to correct hypermetropia:

A) Concave
B) Convex
C) Plane
D) Cylindrical

Correct Answer: B

44. Number of ribs in human body:

A) 12
B) 20
C) 24
D) 28

Correct Answer: C

45. Hardest substance in human body:

A) Bone
B) Enamel
C) Dentine
D) Cartilage

Correct Answer: B

46. Part of brain controlling balance:

A) Cerebrum
B) Cerebellum
C) Medulla
D) Pons

Correct Answer: B

47. Blood group AB is called:

A) Universal donor
B) Universal recipient
C) Rare group
D) Rh negative

Correct Answer: B

48. Organ that detoxifies blood:

A) Kidney
B) Liver
C) Lung
D) Spleen

Correct Answer: B

49. Deficiency of Vitamin D causes:

A) Scurvy
B) Beriberi
C) Rickets
D) Night blindness

Correct Answer: C

50. Main function of RBCs:

A) Fight infection
B) Blood clotting
C) Transport oxygen
D) Produce antibodies

Correct Answer: C