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Home/Class 9/Class 9 Science/Page 5

Category: Class 9 Science

NCERT Solutions for Class 9 Science for CBSE exams 2020-2021.

Discussion Forum Latest Questions

Mohan Sharma
Poll
Mohan Sharma
Asked: February 8, 2025In: Class 9 Science

Which of the following is not a characteristic of musical sound?

The correct answer is (c) Wavelength. Musical sound is characterized by pitch, loudness, and quality (or timbre). Wavelength is a physical property of sound waves but is not directly considered a characteristic of musical sound perception. Class 9th Science NCERT ...

class 9thmcqscience
  • 1 1 Answer
  • 7 Views
  • 1 Vote
Answer
Mohan Sharma
Poll
Mohan Sharma
Asked: February 8, 2025In: Class 9 Science

Sound waves travel as successive compressions and rarefactions. The distance from a centre of compression to next centre of compression, in terms of wavelength λ, is equal to

The correct answer is (b) λ. In a sound wave, one full wavelength (λ) includes a complete cycle of one compression and one rarefaction. The distance from the center of one compression to the next compression is exactly one wavelength ...

class 9thmcqscience
  • 1 1 Answer
  • 38 Views
  • 1 Vote
Answer
Mohan Sharma
Poll
Mohan Sharma
Asked: February 8, 2025In: Class 9 Science

Sound waves can travel

The correct answer is (d) in solids, liquids as well as gases. Sound waves require a medium to propagate, as they travel by vibrating particles. They can move through solids, liquids, and gases, but not through a vacuum. Class 9th ...

class 9thmcqscience
  • 1 1 Answer
  • 8 Views
  • 1 Vote
Answer
Mohan Sharma
Poll
Mohan Sharma
Asked: February 8, 2025In: Class 9 Science

The speed of sound is largest in

The correct answer is (c) Steel. The speed of sound is highest in solids because particles are closely packed, allowing faster transmission of sound waves. In steel, sound travels much faster than in water or air. Sound cannot travel in ...

class 9thmcqscience
  • 1 1 Answer
  • 5 Views
  • 1 Vote
Answer
Mohan Sharma
Poll
Mohan Sharma
Asked: February 8, 2025In: Class 9 Science

Speed of sound (v) in a medium is related to its frequency (v) and wavelength (λ) as :

The correct answer is (a) v = vλ. The speed of sound (v) in a medium is given by the equation v = vλ, where v is the frequency and λ is the wavelength. This equation applies to all wave ...

class 9thmcqscience
  • 1 1 Answer
  • 44 Views
  • 1 Vote
Answer
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