test3

1. During the propagation of sound, what actually travels through the medium? A. Particles of the medium B. The medium itself C. The disturbance D. Energy only ANSWER: The disturbance 2. In sound propagation, the particles of the medium A. Move forward permanently B. Remain completely still C. Oscillate about their mean position D. Travel to the ear ANSWER: Oscillate about their mean position 3. A wave is defined as A. Continuous movement of particles B. Motion of an object C. A disturbance that moves through a medium D. Flow of matter ANSWER: A disturbance that moves through a medium 4. Sound can be visualised as a wave because A. It produces light B. It transfers heat C. It involves propagation of disturbance D. It reflects from surfaces ANSWER: It involves propagation of disturbance 5. Sound waves are called mechanical waves because they A. Travel very fast B. Carry mass C. Need a material medium D. Produce heat ANSWER: Need a material medium 6. Which of the following is the most common medium for sound? A. Water B. Steel C. Air D. Glass ANSWER: Air 7. When a vibrating object moves forward, it produces A. Rarefaction B. Vacuum C. Compression D. Echo ANSWER: Compression 8. Compression is a region of A. Low pressure B. High pressure C. No pressure D. Constant pressure ANSWER: High pressure 9. Rarefaction is a region of A. High density B. High pressure C. Low pressure D. Maximum particles ANSWER: Low pressure 10. A sound wave in air consists of A. Heat and light B. Energy and matter C. Compressions and rarefactions D. Reflections only ANSWER: Compressions and rarefactions 11. Pressure in a medium depends on A. Shape of particles B. Colour of particles C. Number of particles per unit volume D. Temperature only ANSWER: Number of particles per unit volume 12. More density of particles in a region means A. Less pressure B. More pressure C. No pressure D. Vacuum ANSWER: More pressure 13. Sound propagation can be seen as propagation of A. Light waves B. Heat waves C. Pressure variations D. Electrical waves ANSWER: Pressure variations 14. Sound cannot travel through A. Air B. Water C. Steel D. Vacuum ANSWER: Vacuum 15. The bell jar experiment proves that A. Sound needs energy B. Sound reflects C. Sound needs a medium D. Sound is loud ANSWER: Sound needs a medium 16. As air is removed from the bell jar, the sound becomes faint because A. The bell stops vibrating B. Electric current reduces C. Medium for sound decreases D. Temperature rises ANSWER: Medium for sound decreases 17. If all air is removed from the bell jar, the sound will A. Become louder B. Remain same C. Be very faint D. Not be heard ANSWER: Not be heard 18. Sound waves are mechanical because they A. Are transverse B. Are visible C. Need matter to travel D. Travel in vacuum ANSWER: Need matter to travel 19. Sound produced by a school bell is due to A. Heating of air B. Vibration of the bell C. Light emission D. Air pressure only ANSWER: Vibration of the bell 20. On the moon, sound cannot be heard because A. Gravity is less B. No vibration occurs C. There is no air D. Temperature is low ANSWER: There is no air 21. The slinky experiment demonstrates A. Transverse waves B. Light waves C. Longitudinal waves D. Heat waves ANSWER: Longitudinal waves 22. In longitudinal waves, particles move A. Perpendicular to wave direction B. Parallel to wave direction C. In circular paths D. Randomly ANSWER: Parallel to wave direction 23. Sound waves are classified as A. Transverse waves B. Surface waves C. Longitudinal waves D. Standing waves ANSWER: Longitudinal waves 24. In sound waves, particles A. Travel with the wave B. Remain fixed C. Oscillate back and forth D. Move upward only ANSWER: Oscillate back and forth 25. The direction of particle vibration in sound waves is A. Perpendicular to propagation B. Parallel to propagation C. Circular D. Diagonal ANSWER: Parallel to propagation 26. Transverse waves differ from longitudinal waves because A. Particles move parallel B. Particles move perpendicular C. They need a medium D. They produce sound ANSWER: Particles move perpendicular 27. An example of a transverse wave is A. Sound in air B. Sound in water C. Light D. Ultrasound ANSWER: Light 28. Water surface waves produced by a pebble are A. Longitudinal B. Mechanical longitudinal C. Transverse D. Electromagnetic ANSWER: Transverse 29. Light is not a mechanical wave because A. It is slow B. It has no energy C. It does not need a medium D. It produces heat ANSWER: It does not need a medium 30. In transverse waves, particles oscillate A. Along wave direction B. Forward only C. Up and down D. In circles ANSWER: Up and down 31. The movement of disturbance in sound is due to A. Particle transfer B. Energy transfer C. Medium transfer D. Matter flow ANSWER: Energy transfer 32. Sound waves carry A. Matter B. Particles C. Energy D. Medium ANSWER: Energy 33. The slinky dot moves A. Permanently forward B. In circles C. Back and forth D. Randomly ANSWER: Back and forth 34. Which wave needs a medium to travel? A. Light wave B. Radio wave C. Sound wave D. X-ray ANSWER: Sound wave 35. The disturbance in sound waves moves because A. Particles flow B. Particles push neighbours C. Medium shifts D. Pressure stops ANSWER: Particles push neighbours 36. Rarefaction corresponds to A. Maximum density B. Minimum density C. No density D. Constant density ANSWER: Minimum density 37. Compression corresponds to A. Low density B. No pressure C. High density D. Zero particles ANSWER: High density 38. Sound propagation in air is A. Electromagnetic B. Mechanical C. Thermal D. Optical ANSWER: Mechanical 39. Sound waves in air are A. Transverse B. Longitudinal C. Circular D. Standing ANSWER: Longitudinal 40. In the bell jar experiment, the bell continues vibrating but sound fades because A. Vibration stops B. Current reduces C. Medium reduces D. Pressure increases ANSWER: Medium reduces 41. Sound waves do not transport A. Energy B. Disturbance C. Particles D. Pressure variations ANSWER: Particles 42. Which statement is correct? A. Sound travels in vacuum B. Particles move long distances C. Sound is a mechanical wave D. Sound is electromagnetic ANSWER: Sound is a mechanical wave 43. The propagation of sound involves A. Heat flow B. Light reflection C. Density variations D. Colour changes ANSWER: Density variations 44. In sound waves, each particle A. Stops after vibration B. Pushes the next particle C. Moves to the ear D. Disappears ANSWER: Pushes the next particle 45. The energy of sound moves due to A. Air flow B. Particle transport C. Wave motion D. Medium movement ANSWER: Wave motion 46. Sound waves require a medium because A. They are slow B. They involve particle vibrations C. They reflect light D. They produce heat ANSWER: They involve particle vibrations 47. In longitudinal waves, compressions and rarefactions are formed due to A. Temperature changes B. Pressure changes C. Colour changes D. Shape changes ANSWER: Pressure changes 48. Which of the following is NOT a mechanical wave? A. Sound B. Water wave C. Light D. Slinky wave ANSWER: Light 49. Sound reaches our ear because A. Air flows into ear B. Particles travel C. Disturbance reaches ear D. Medium moves ANSWER: Disturbance reaches ear 50. The correct sequence in sound propagation is A. Particle flow → sound B. Vibration → disturbance → ear C. Heat → pressure → sound D. Medium movement → sound ANSWER: Vibration → disturbance → ear ________________________________________