RRB Group D - Sound and light basics Online Test (MCQ Quiz)

1. What is the nature of sound waves?

A) Transverse waves B) Longitudinal waves C) Electromagnetic waves D) Surface waves

2. Which of the following is a characteristic of light waves?

A) They require a medium to travel B) They are longitudinal waves C) They are electromagnetic waves D) They travel slower than sound in a vacuum

3. What is the unit of frequency?

A) Meter B) Second C) Hertz D) Watt

4. The speed of sound in air at room temperature is approximately:

A) 150 m/s B) 343 m/s C) 500 m/s D) 1200 m/s

5. Which phenomenon explains why we see a rainbow after rain?

A) Reflection B) Refraction C) Dispersion D) Diffraction

6. The bending of light as it passes from one medium to another is called:

A) Reflection B) Diffraction C) Refraction D) Interference

7. What is the approximate speed of light in a vacuum?

A) 3 x 10^8 m/s B) 3 x 10^6 m/s C) 3 x 10^8 km/s D) 3 x 10^5 m/s

8. Which of the following terms describes the loudness of a sound?

A) Frequency B) Wavelength C) Amplitude D) Pitch

9. The color of light is determined by its:

A) Amplitude B) Intensity C) Frequency D) Speed

10. When light bounces off a surface, the phenomenon is known as:

A) Refraction B) Diffraction C) Reflection D) Polarization

11. The phenomenon of sound travelling through a medium is due to:

A) Vibrations of particles B) Movement of electrons C) Rotation of the Earth D) Change in pressure

12. Which medium does sound travel fastest in?

A) Air B) Water C) Steel D) Vacuum

13. The persistence of hearing, after the sound source has stopped, is typically around:

A) 0.01 seconds B) 0.1 seconds C) 1 second D) 10 seconds

14. What is the term for the number of complete vibrations or cycles per second?

A) Amplitude B) Wavelength C) Frequency D) Period

15. The distance between two consecutive crests or troughs of a wave is called:

A) Frequency B) Amplitude C) Wavelength D) Velocity

16. Which of the following is an example of reflection of sound?

A) Echo B) Rainbow C) Mirage D) Dispersion

17. Sound waves cannot travel through:

A) Solids B) Liquids C) Gases D) Vacuum

18. The phenomenon where light bends around obstacles is called:

A) Refraction B) Reflection C) Diffraction D) Interference

19. What property of light allows us to see objects that do not emit light themselves?

A) Reflection B) Refraction C) Diffraction D) Dispersion

20. The pitch of a sound is determined by its:

A) Amplitude B) Wavelength C) Frequency D) Speed

21. When two or more light waves combine, the phenomenon is called:

A) Diffraction B) Interference C) Refraction D) Dispersion

22. The time taken for one complete oscillation or cycle is called:

A) Frequency B) Amplitude C) Period D) Wavelength

23. A sonar system uses which property of sound to detect underwater objects?

A) Refraction B) Diffraction C) Reflection D) Interference

24. The splitting of white light into its constituent colors is called:

A) Reflection B) Refraction C) Diffraction D) Dispersion

25. Which of the following is a type of electromagnetic wave associated with heat radiation?

A) Visible light B) Ultraviolet light C) Infrared radiation D) X-rays

26. The intensity of sound is measured in units of:

A) Decibels (dB) B) Hertz (Hz) C) Meters (m) D) Watts (W)

27. When light passes through a small aperture and spreads out, it is called:

A) Reflection B) Refraction C) Diffraction D) Dispersion

28. The phenomenon of light traveling in straight lines is called:

A) Rectilinear propagation B) Wave propagation C) Particle propagation D) Refraction

29. Which part of the electromagnetic spectrum is responsible for tanning the skin?

A) Infrared B) Visible light C) Ultraviolet D) Microwaves

30. The speed of sound is affected by:

A) The color of the medium B) The temperature of the medium C) The intensity of the sound D) The frequency of the sound

31. What is the relationship between frequency (f) and period (T) of a wave?

A) f = T B) f = 1/T C) f = T^2 D) f = sqrt(T)

32. A sound wave with a frequency above the human hearing range (20 kHz) is called:

A) Infrasound B) Ultrasound C) Audible sound D) Noise

33. Which optical instrument utilizes the principle of reflection of light?

A) Microscope B) Telescope (reflecting type) C) Periscope D) All of the above

34. The ability of light to pass through a medium is described by its:

A) Opacity B) Transparency C) Translucency D) Luminosity

35. What is the term for the characteristic sound quality that distinguishes different voices or instruments?

A) Loudness B) Pitch C) Timbre D) Echo

36. The Doppler effect is the change in frequency of a wave in relation to an observer who is:

A) Stationary B) Moving with the wave C) Moving relative to the wave source D) In a different medium

37. Which phenomenon is responsible for the blue color of the sky?

A) Reflection B) Refraction C) Dispersion D) Scattering

38. The fundamental equation relating wave speed (v), frequency (f), and wavelength (λ) is:

A) v = f / λ B) v = λ / f C) v = f * λ D) v = f + λ

39. Which type of mirror always forms a virtual, erect, and diminished image?

A) Plane mirror B) Convex mirror C) Concave mirror D) None of the above

40. The minimum distance required for an echo to be heard distinctly is approximately:

A) 3.4 meters B) 17 meters C) 34 meters D) 170 meters

41. Which of the following is a characteristic of longitudinal waves?

A) Particles vibrate perpendicular to the direction of wave motion B) Particles vibrate parallel to the direction of wave motion C) They are electromagnetic waves D) They can travel through a vacuum

42. The phenomenon of light bending inside a medium due to variations in refractive index is called:

A) Reflection B) Diffraction C) Scintillation D) Refraction

43. The inverse square law relates the intensity of light or sound to:

A) Frequency B) Wavelength C) Distance from the source D) Amplitude

44. What is the term for the point where parallel rays of light converge after reflection or refraction?

A) Center of curvature B) Principal axis C) Focal point D) Pole

45. The phenomenon that allows us to hear sounds from around corners is:

A) Reflection B) Refraction C) Diffraction D) Interference

46. Sound waves are mechanical waves, meaning they:

A) Can travel through empty space B) Require a medium for propagation C) Are a form of electromagnetic radiation D) Travel at the speed of light

47. Which part of the visible spectrum has the longest wavelength?

A) Violet B) Green C) Yellow D) Red

48. What is the minimum audible sound intensity for a healthy human ear?

A) 0 dB B) 10 dB C) 20 dB D) 100 dB

49. When light encounters an opaque object, it is:

A) Refracted B) Diffracted C) Transmitted D) Absorbed or Reflected

50. The phenomenon of sound interference can lead to:

A) Echoes B) Beats C) Reverberation D) Resonance

Sound and light basics - Online Test

Test Results