CBSE Class 10 Science Board Exam MCQ Practice
CBSE Class 10 Science Board Exam MCQ Practice
Class: 10
Subject: Science
Section: Exam Oriented
Topic: CBSE Class 10 Science Board Exam MCQ Practice
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 10 Science Board Examination preparation.
Subject: Science
Section: Exam Oriented
Topic: CBSE Class 10 Science Board Exam MCQ Practice
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 10 Science Board Examination preparation.
1. The pH of a neutral solution at 25°C is:
Answer: B. 7
Explanation: Neutral solutions have equal concentration of H⁺ and OH⁻ ions. At 25°C, this balance gives a pH value of 7.
Explanation: Neutral solutions have equal concentration of H⁺ and OH⁻ ions. At 25°C, this balance gives a pH value of 7.
2. The functional unit of the kidney is:
Answer: B. Nephron
Explanation: Nephrons filter blood, remove wastes, and regulate water and salts forming urine.
Explanation: Nephrons filter blood, remove wastes, and regulate water and salts forming urine.
3. Ohm’s Law states that:
Answer: C. V ∝ I
Explanation: At constant temperature, current is directly proportional to voltage (V = IR).
Explanation: At constant temperature, current is directly proportional to voltage (V = IR).
4. The process of coating iron with zinc is called:
Answer: B. Galvanization
Explanation: Zinc coating prevents rusting by forming a protective barrier.
Explanation: Zinc coating prevents rusting by forming a protective barrier.
5. The image formed by a plane mirror is:
Answer: B. Virtual & erect
Explanation: Plane mirrors always form virtual, erect images of same size.
Explanation: Plane mirrors always form virtual, erect images of same size.
6. The gas released during photosynthesis is:
Answer: B. O₂
Explanation: Oxygen is released when water splits during light reaction.
Explanation: Oxygen is released when water splits during light reaction.
7. Unit of electric power is:
Answer: C. Watt
Explanation: Power = Voltage × Current. SI unit is Watt.
Explanation: Power = Voltage × Current. SI unit is Watt.
8. Ethanol belongs to which homologous series?
Answer: C. Alcohol
Explanation: Presence of –OH functional group classifies ethanol as alcohol.
Explanation: Presence of –OH functional group classifies ethanol as alcohol.
9. Concave mirror is used as shaving mirror because it:
Answer: C. Forms magnified image
Explanation: When face is within focal length, image is virtual and enlarged.
Explanation: When face is within focal length, image is virtual and enlarged.
10. Mendel worked on:
Answer: B. Pea plant
Explanation: Pea plants had clear contrasting traits suitable for genetics study.
Explanation: Pea plants had clear contrasting traits suitable for genetics study.
11. SI unit of resistance:
Answer: Ohm — measures opposition to current.
12. Metal liquid at room temperature:
Answer: Mercury — only liquid metal at RT.
13. Largest artery:
Answer: Aorta — carries oxygenated blood.
14. Lens used in myopia:
Answer: Concave — diverges light.
15. Green pigment:
Answer: Chlorophyll — traps solar energy.
16. Rusting needs:
Answer: Both oxygen & moisture.
17. Speed of light:
Answer: 3×10⁸ m/s.
18. Universal solvent:
Answer: Water — dissolves most substances.
19. Human male chromosome:
Answer: XY.
20. Device converting electrical to mechanical energy:
Answer: Motor
Explanation: Electric motor works on Fleming’s Left Hand Rule converting electrical energy into motion.
Explanation: Electric motor works on Fleming’s Left Hand Rule converting electrical energy into motion.