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sound Class 9 mcq. We covered all the sound Class 9 mcq in this post for free so that you can practice well for the exam.
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sound Class 9 Objective mcq for Students
In television transmission, visual (picture) signals are sent using
A) Amplitude modulation
B) Frequency modulation
C) Phase modulation
D) Angle modulation
Option a – Amplitude modulation
In TV broadcasting, sound signals are transmitted through the method of
A) Amplitude modulation
B) Pulse code modulation
C) Frequency modulation
D) Time-division multiplexing
Option c – Frequency modulation
A radio station operates in the 30-metre wavelength band. What is the frequency of its carrier wave?
A) 10 kHz
B) 100 kHz
C) 10 MHz
D) 100 MHz
Option c – 10 MHz
Arrange the following media in increasing order of the speed of sound. 1. Water 2. Steel 3. Nitrogen
A) 3, 2, 1
B) 3, 1, 2
C) 1, 3, 2
D) 2, 1, 3
Option b – 3, 1, 2
Consider the following statements. 1. A shorter flute produces sound waves of lower frequency. 2. In rocks, sound propagates only as longitudinal elastic waves. Which of the above statements is/are correct?
A) Only 1
B) Only 2
C) Both 1 and 2
D) Neither 1 nor 2
Option b – Only 2
Examine the following statements related to ultrasonic waves. 1. They are capable of destroying insects. 2. They help in cleaning fabrics by removing dirt. 3. They are used in medical treatments. 4. They are applied in controlling automatic doors. Which of these statements are correct?
A) 1 and 2
B) 3 and 4
C) 1, 2, and 3
D) All of these
Option d – All of these
Consider the following statements. 1. The human heart produces infrasonic vibrations. 2. sound travels faster in gases than in liquids and Solids. 3. Mach number is used to express the speed of sound. 4. Ultrasonic waves have frequencies greater than 20,000 Hz. Which of the above statements are correct?
A) 1, 2, and 3
B) 2, 3, and 4
C) 1, 3, and 4
D) 1, 2, and 4
Option c – 1, 3, and 4
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