Here are **15 high-yield objective questions (MCQs)** with immediate answers for Class 10 Physics, covering key topics from Light, Electricity, Magnetism, and Human Eye:
### **Class 10 Physics - Objective Questions**
**1. The SI unit of electric current is:**
(A) Volt
(B) Ampere
(C) Ohm
(D) Joule
**Answer: (B) Ampere**
**2. Which mirror is used by dentists to view a large image of teeth?**
(A) Convex mirror
(B) Plane mirror
(C) Concave mirror
(D) Cylindrical mirror
**Answer: (C) Concave mirror**
**3. The focal length of a spherical mirror with a radius of curvature of 30\text{ cm} is:**
(A) 15\text{ cm}
(B) 30\text{ cm}
(C) 60\text{ cm}
(D) 10\text{ cm}
**Answer: (A) 15\text{ cm}** *(Since f = \frac{R}{2})*
**4. The least distance of distinct vision for a normal human eye is:**
(A) 25\text{ m}
(B) 2.5\text{ cm}
(C) 25\text{ cm}
(D) Infinity
**Answer: (C) 25\text{ cm}**
**5. Which component is used to measure electrical potential difference across a circuit?**
(A) Ammeter
(B) Voltmeter
(C) Rheostat
(D) Galvanometer
**Answer: (B) Voltmeter**
**6. The splitting of white light into its seven constituent colors through a prism is called:**
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Total Internal Reflection
**Answer: (C) Dispersion**
**7. A concave lens always forms an image that is:**
(A) Real and inverted
(B) Virtual and erect
(C) Real and magnified
(D) Virtual and inverted
**Answer: (B) Virtual and erect**
**8. The SI unit of power of a lens is:**
(A) Meter
(B) Watt
(C) Diopter
(D) Hertz
**Answer: (C) Diopter**
**9. Resistance of a conductor is inversely proportional to its:**
(A) Length
(B) Area of cross-section
(C) Temperature
(D) Material density
**Answer: (B) Area of cross-section**
**10. What defect of vision occurs when an individual cannot see nearby objects clearly?**
(A) Myopia (Short-sightedness)
(B) Hypermetropia (Long-sightedness)
(C) Presbyopia
(D) Astigmatism
**Answer: (B) Hypermetropia (Long-sightedness)**
**11. Commercial unit of electric energy (1\text{ kWh}) is equal to:**
(A) 3.6 \times 10^6\text{ J}
(B) 3.6 \times 10^5\text{ J}
(C) 1000\text{ J}
(D) 360\text{ J}
**Answer: (A) 3.6 \times 10^6\text{ J}**
**12. The magnetic field lines inside a current-carrying solenoid are:**
(A) Circular
(B) Parabolic
(C) Parallel straight lines
(D) Elliptical
**Answer: (C) Parallel straight lines**
**13. A device that converts mechanical energy into electrical energy is a:**
(A) Electric motor
(B) Electric generator
(C) Transformer
(D) Galvanometer
**Answer: (B) Electric generator**
**14. In Fleming's Left-Hand Rule, the forefinger indicates the direction of:**
(A) Electric current
(B) Magnetic field
(C) Motion/Force on the conductor
(D) Induced current
**Answer: (B) Magnetic field**
**15. Blue color of the sky is due to:**
(A) Refraction of light
(B) Dispersion of light
(C) Scattering of light
(D) Atmospheric reflection
**Answer: (C) Scattering of light**
