Wave nature, properties, reflection, echo, SONARPractice Questions & MCQs
Practice Wave nature, properties, reflection, echo, SONAR questions from Sound (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Wave nature, properties, reflection, echo, SONARQuiz - Solve & Score
Q1. Sound waves of frequencies 10 Hz, 5000 Hz and 50000 Hz are emitted. Which one lies within the human audible range?
- A.5000 Hz
- B.10 Hz
- C.50000 Hz
- D.All three
Answer: A. 5000 Hz
Q2. A buzzer fixed on a child's toy vibrates 170 times each second while the air around it carries sound at 340 m/s. What is the wavelength of the note it sends out?
- A.2 m
- B.57800 m
- C.0.5 m
- D.1 m
Answer: A. 2 m
lambda = v/f = 340/170 = 2 m.
Q3. A street vendor's electric horn sounds at 250 Hz and the sound spreads outward at 1500 m/s along the lane. What is the wavelength of the horn's note?
- A.6 m
- B.3 m
- C.375000 m
- D.0.1667 m
Answer: A. 6 m
lambda = v/f = 1500/250 = 6 m.
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