Class 7 Science MCQs - Chapter 23
Sound Waves Quiz Questions & Answers PDF Download - 27
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Sound Waves Exam Questions and Answers PDF Download: Test 27
Two similar string instruments are
- piano and guitar
- piano and violin
- guitar and violin
- harp and piano
Notes are put together to produce a pleasing sound known as
- noise
- pitch
- music
- phase
Sounds with a high frequency which a human ear can detect are known as
- infrasound
- ultrasounds
- high sounds
- low sounds
When the hand bell stimulates air particles,
- temperature increases
- pressure increases in the air
- both temperature and pressure decreases in the air
- humidity of air keeps on increasing and decreasing
To avoid noise from the surroundings
- soft curtains should be used
- hard curtains should be used
- glass windows should be used
- vacuum windows should be used
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