CBSE Class 10 Science Exam 2025: The CBSE Class 10 Science Board Exam 2025 is just around the corner, scheduled for February 20, 2025. With only a short time left, students must focus on quick revision and concept clarity to maximize their scores. To aid in efficient last-minute preparation, we have compiled the Top 50 MCQs with Answers, covering all important topics from Physics, Chemistry, and Biology.
These multiple-choice questions will help students assess their understanding, improve accuracy, and boost confidence before the exam. Solving these MCQs along with checking the solutions ensures a strong grasp of key concepts, helping students score high in the CBSE Class 10 Science Exam 2025. Stay focused, revise smartly, and get exam-ready with these expert-curated questions!
1. A ray of light passes from air to glass. What happens to its wavelength and speed?
a) Both increase
b) Both decrease
c) Wavelength increases, speed decreases
d) Wavelength decreases, speed increases
Answer: b) Both decrease
2. A convex lens is used to form a real, inverted, and magnified image. What is the position of the object?
a) Between focus and optical center
b) Beyond 2F
c) At infinity
d) Between F and 2F
Answer: d) Between F and 2F
3. Which device is used to protect household electrical circuits from short circuits and overloading?
a) Voltmeter
b) Transformer
c) Fuse
d) Resistor
Answer: c) Fuse
4. An object is placed 10 cm in front of a concave mirror with a focal length of 15 cm. The image formed will be:
a) Virtual, erect, and magnified
b) Real, inverted, and magnified
c) Real, inverted, and diminished
d) Virtual, erect, and diminished
Answer: a) Virtual, erect, and magnified
5. Which factor does NOT affect the resistance of a conductor?
a) Length of the conductor
b) Material of the conductor
c) Density of the conductor
d) Temperature of the conductor
Answer: c) Density of the conductor
6. The power of an electric device depends on which two quantities?
a) Voltage and resistance
b) Current and voltage
c) Current and resistance
d) Capacitance and resistance
Answer: b) Current and voltage
7. A 60 W bulb and a 100 W bulb are connected in parallel. Which bulb will glow brighter?
a) 60 W
b) 100 W
c) Both glow equally
d) Cannot be determined
Answer: b) 100 W
8. The electric motor works on the principle of:
a) Faraday’s Law of Induction
b) Fleming’s Left-Hand Rule
c) Joule’s Law of Heating
d) Pascal’s Principle
Answer: b) Fleming’s Left-Hand Rule
9. The dispersion of light occurs because of:
a) Reflection
b) Refraction
c) Scattering
d) Interference
Answer: b) Refraction
10. Why is the sky blue?
a) Due to reflection of light
b) Due to scattering of shorter wavelengths
c) Due to refraction through the atmosphere
d) Due to absorption of blue light by the air
Answer: b) Due to scattering of shorter wavelengths
11. A concave mirror produces an image that is real, inverted, and of the same size as the object. What is the object’s position?
a) At focus (F)
b) At infinity
c) At the center of curvature (C)
d) Between focus and center of curvature
Answer: c) At the center of curvature (C)
12. Which type of lens is used in a magnifying glass?
a) Concave lens
b) Convex lens
c) Cylindrical lens
d) None of the above
Answer: b) Convex lens
13. A wire of resistance 4Ω is bent into a circular loop. What will be the effective resistance between two diametrically opposite points?
a) 1Ω
b) 2Ω
c) 4Ω
d) 8Ω
Answer: b) 2Ω
14. A charged particle enters a uniform magnetic field perpendicularly. What type of motion will it follow?
a) Straight-line motion
b) Circular motion
c) Zig-zag motion
d) Random motion
Answer: b) Circular motion
15. A household electrical circuit is connected in:
a) Series
b) Parallel
c) Both series and parallel
d) None of the above
Answer: b) Parallel
16. Which of the following properties of light does NOT change when it enters a different medium?
a) Wavelength
b) Speed
c) Frequency
d) Direction
Answer: c) Frequency
17. Which part of the human eye controls the amount of light entering it?
a) Retina
b) Cornea
c) Pupil
d) Lens
Answer: c) Pupil
18. A light ray strikes a glass slab at an angle of 40°. If the refractive index of glass is 1.5, what is the approximate angle of refraction?
a) 25°
b) 30°
c) 45°
d) 50°
Answer: a) 25°
19. Which type of reaction occurs when an acid reacts with a base?
a) Displacement reaction
b) Oxidation reaction
c) Neutralization reaction
d) Reduction reaction
Answer: c) Neutralization reaction
20. Which gas is evolved when zinc reacts with dilute hydrochloric acid?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Carbon dioxide
Answer: b) Hydrogen
21. Which of the following metals is the most reactive?
a) Gold
b) Copper
c) Iron
d) Sodium
Answer: d) Sodium
22. What is the color of the precipitate formed when sodium hydroxide is added to a solution of copper sulfate?
a) White
b) Green
c) Blue
d) Red
Answer: c) Blue
23. What is the chemical formula of baking soda?
a) Na₂CO₃
b) NaHCO₃
c) CaCO₃
d) NaOH
Answer: b) NaHCO₃
24. Which functional group is present in ethanol?
a) –COOH
b) –CHO
c) –OH
d) –CO
Answer: c) –OH
25. Which allotrope of carbon is the hardest naturally occurring substance?
a) Graphite
b) Diamond
c) Fullerene
d) Coal
Answer: b) Diamond
26. What is the pH value of pure water at room temperature?
a) 5
b) 7
c) 9
d) 14
Answer: b) 7
27. Which process is used to separate different components of crude oil?
a) Crystallization
b) Distillation
c) Filtration
d) Chromatography
Answer: b) Distillation
28. Which element is used as a catalyst in the hydrogenation of oils?
a) Copper
b) Nickel
c) Iron
d) Zinc
Answer: b) Nickel
29. Which of the following reactions is an example of a displacement reaction?
a) NaCl + AgNO₃ → AgCl + NaNO₃
b) 2H₂ + O₂ → 2H₂O
c) Zn + CuSO₄ → ZnSO₄ + Cu
d) HCl + NaOH → NaCl + H₂O
Answer: c) Zn + CuSO₄ → ZnSO₄ + Cu
30. Which acid is present in sour milk or curd?
a) Acetic acid
b) Lactic acid
c) Formic acid
d) Citric acid
Answer: b) Lactic acid
31. Which of the following is an example of a strong base?
a) NH₃
b) CH₃COOH
c) NaOH
d) H₂CO₃
Answer: c) NaOH
32. Which type of bonding is responsible for the high melting point of ionic compounds?
a) Covalent bonding
b) Metallic bonding
c) Ionic bonding
d) Van der Waals forces
Answer: c) Ionic bonding
33. Which metal is used in making thermometers because it remains in a liquid state over a wide range of temperatures?
a) Iron
b) Mercury
c) Zinc
d) Silver
Answer: b) Mercury
34. What is the common name of CaO?
a) Slaked lime
b) Quicklime
c) Bleaching powder
d) Baking soda
Answer: b) Quicklime
35. The chemical formula of washing soda is:
a) NaHCO₃
b) Na₂CO₃.10H₂O
c) CaO
d) NaCl
Answer: b) Na₂CO₃.10H₂O
36. Which gas is liberated when sodium carbonate reacts with hydrochloric acid?
a) Oxygen
b) Hydrogen
c) Carbon dioxide
d) Nitrogen
Answer: c) Carbon dioxide
37. Which part of the plant is responsible for photosynthesis?
a) Roots
b) Stems
c) Leaves
d) Flowers
Answer: c) Leaves
38. Which gas is released during photosynthesis?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Hydrogen
Answer: a) Oxygen
39. What is the basic structural and functional unit of life?
a) Tissue
b) Organ
c) Cell
d) Organ system
Answer: c) Cell
40. Which blood group is called the universal donor?
a) A
b) B
c) AB
d) O
Answer: d) O
41. Which disease is caused by the deficiency of insulin?
a) Anemia
b) Diabetes
c) Goiter
d) Rickets
Answer: b) Diabetes
42. Which part of the plant is responsible for the transportation of food?
a) Xylem
b) Phloem
c) Epidermis
d) Stomata
Answer: b) Phloem
43. Which organ in the human body produces insulin?
a) Liver
b) Pancreas
c) Kidney
d) Lungs
Answer: b) Pancreas
44. Which type of reproduction results in offspring that are genetically identical to the parent?
a) Sexual reproduction
b) Asexual reproduction
c) Hybrid reproduction
d) Cross-pollination
Answer: b) Asexual reproduction
45. Which blood component is responsible for clotting?
a) Red blood cells
b) White blood cells
c) Platelets
d) Plasma
Answer: c) Platelets
46. Which hormone is known as the "growth hormone" in humans?
a) Insulin
b) Thyroxine
c) Adrenaline
d) Somatotropin
Answer: d) Somatotropin
47. Which hormone regulates the balance of calcium and phosphate in the blood and bones?
a) Insulin
b) Thyroxine
c) Parathyroid hormone
d) Adrenaline
Answer: c) Parathyroid hormone
48. Which part of the brain controls voluntary actions such as walking and writing?
a) Medulla oblongata
b) Cerebellum
c) Cerebrum
d) Hypothalamus
Answer: c) Cerebrum
49. Which of the following is NOT a biodegradable waste?
a) Paper
b) Vegetable peels
c) Plastic bottle
d) Cotton cloth
Answer: c) Plastic bottle
50. Which of the following correctly represents the path of oxygen in the human respiratory system?
a) Nose → Lungs → Trachea → Bronchi → Alveoli
b) Nose → Trachea → Bronchi → Lungs → Alveoli
c) Nose → Trachea → Bronchi → Alveoli → Lungs
d) Nose → Bronchi → Trachea → Alveoli → Lungs
Answer: b) Nose → Trachea → Bronchi → Lungs → Alveoli
Biology in Class 10 CBSE focuses on key life processes, ecosystems, and human physiology. The most important topics for the 2025 board exam include:
Revision for Class 10 Science should be smart and strategic. Follow these steps for quick and effective last-minute revision:
Infinity Learn is one of the best platforms for Class 10 MCQs, offering:
Chapter-wise MCQs covering NCERT syllabus
Detailed explanations for answers
Mock tests & quizzes for exam practice
Timed practice tests to improve speed & accuracy
Updated CBSE pattern-based questions
Using Infinity Learn’s MCQs, students can assess their preparation, identify weak areas, and improve problem-solving skills for the CBSE Class 10 Science Board Exam 2025.
S Chand is a great reference book, but NCERT should always be the primary source for CBSE Class 10 Science preparation.
For scoring high in the CBSE Class 10 Science Board Exam, NCERT + S Chand + sample papers is an ideal combination