questions (MCQs) on Class 11 Physics along with their answers:

 multiple-choice questions (MCQs) on Class 11 Physics along with their answers:

**1. Which of the following is a scalar quantity?**

   a) Force

   b) Velocity

   c) Mass

   d) Acceleration

   **Answer: c) Mass**

**2. The SI unit of electric charge is:**

   a) Ampere

   b) Volt

   c) Coulomb

   d) Ohm

   **Answer: c) Coulomb**

**3. Which law of motion states that "For every action, there is an equal and opposite reaction"?**

   a) Newton's First Law

   b) Newton's Second Law

   c) Newton's Third Law

   d) Newton's Law of Gravitation

   **Answer: c) Newton's Third Law**

**4. The phenomenon of dispersion of light is due to:**

   a) Refraction

   b) Diffraction

   c) Polarization

   d) Dispersion

   **Answer: d) Dispersion**

**5. Which of the following is a non-conservative force?**

   a) Gravitational force

   b) Electric force

   c) Frictional force

   d) Tension in a string

   **Answer: c) Frictional force**

**6. The speed of sound in air at room temperature (approximately 20°C) is approximately:**

   a) 343 m/s

   b) 300,000 m/s

   c) 3 m/s

   d) 1500 m/s

   **Answer: a) 343 m/s**

**7. What is the SI unit of work and energy?**

   a) Joule

   b) Newton

   c) Watt

   d) Pascal

   **Answer: a) Joule**

**8. Which of the following is not a unit of power?**

   a) Watt

   b) Volt

   c) Horsepower

   d) Kilowatt

   **Answer: b) Volt**

**9. Which law of thermodynamics states that "Energy cannot be created or destroyed, only transformed or transferred"?**

   a) Zeroth Law of Thermodynamics

   b) First Law of Thermodynamics

   c) Second Law of Thermodynamics

   d) Third Law of Thermodynamics

   **Answer: b) First Law of Thermodynamics**

**10. The focal length of a convex lens is positive or negative depending on its:**

   a) Refractive index

   b) Material

   c) Thickness

   d) Curvature

   **Answer: d) Curvature**

**11. What type of waves are sound waves?**

   a) Transverse waves

   b) Electromagnetic waves

   c) Longitudinal waves

   d) Standing waves

   **Answer: c) Longitudinal waves**

**12. In which type of motion is the velocity constant, but not zero?**

   a) Uniform motion

   b) Uniformly accelerated motion

   c) Non-uniform motion

   d) Rest

   **Answer: a) Uniform motion**

**13. Which electromagnetic wave has the highest frequency?**

   a) Radio waves

   b) Microwaves

   c) X-rays

   d) Infrared

   **Answer: c) X-rays**

**14. Which of the following is a semiconductor material?**

   a) Copper

   b) Aluminum

   c) Silicon

   d) Gold

   **Answer: c) Silicon**

**15. The resistance of a conductor is directly proportional to its:**

   a) Length

   b) Area

   c) Temperature

   d) Material

   **Answer: a) Length**

**16. Which of the following quantities is a vector?**

   a) Speed

   b) Distance

   c) Displacement

   d) Mass

   **Answer: c) Displacement**

**17. The acceleration due to gravity on the surface of the Earth is approximately:**

   a) 9.8 m/s²

   b) 3.0 x 10^8 m/s²

   c) 1.0 m/s²

   d) 6.67 x 10^-11 m/s²

   **Answer: a) 9.8 m/s²**

**18. Which of the following is an example of a simple machine?**

   a) Pulley

   b) Battery

   c) Magnet

   d) Light bulb

   **Answer: a) Pulley**

**19. The wavelength of visible light ranges from approximately:**

   a) 10 nanometers to 100 nanometers

   b) 1 millimeter to 10 millimeters

   c) 400 nanometers to 700 nanometers

   d) 1 meter to 10 meters

   **Answer: c) 400 nanometers to 700 nanometers**

**20. Which law of motion is often stated as "F = ma"?**

   a) Newton's First Law

   b) Newton's Second Law

   c) Newton's Third Law

   d) Newton's Law of Universal Gravitation

   **Answer: b) Newton's Second Law**