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 broadcasts, the picture signals are transmitted by
A) Amplitude modulation
B) Frequency modulation
C) Phase modulation
D) Angle modulation
Option a – Amplitude modulation
The technique used to transmit audio signals in television broadcasts is
A) Amplitude modulation
B) Pulse code modulation
C) Frequency modulation
D) Time dimension multiplication
Option c – Frequency modulation
A radio station broadcasts at the 30-meter band. The frequency of the carrier wave transmitted by this station is
A) 10 kHz
B) 100 kHz
C) 10 MHz
D) 100 MHz
Option c – 10 MHz
Put in ascending order the speed of sound in the mediums. 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 flute of a smaller length produces waves of lower frequency. 2. Sound travels in rocks in the form of longitudinal elastic waves only. Which of the statements given above is/are correct?
A) Only 1
B) Only 2
C) Both 1 and 2
D) Neither 1 nor 2
Option b – Only 2
Consider the following statements about ultrasonic waves. 1. They can destroy insects. 2. They can clean clothes by removing dust. 3. They can be used to treat diseases. 4. They can control automatic doors. Of the above statements which are correct?
A) 1 and 2 are correct
B) 3 and 4 are correct
C) 1, 2, and 3 are correct
D) All are correct
Option d – All are correct
Consider the following statements. 1. The heart vibrates at infrasonics. 2. The speed of sound is more in gas than in liquid and solid. 3. Mach number is used to describe the speed of sound. 4. Ultrasonic sound has a frequency of more than 20,000 Hz. Of these statements which are correct?
A) 1, 2, and 3 are correct
B) 2, 3, and 4 are correct
C) 1, 3, and 4 are correct
D) 1, 2, and 4 are correct
Option c – 1, 3, and 4 are correct
We covered all the sound class 9 mcq above in this post for free so that you can practice well for the exam.
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