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ICSE Class 10 Chemical Changes, Reactions & Atmospheric Pollution — practice questions — page 2

Explore 50 free Chemical Changes, Reactions & Atmospheric Pollution questions in ICSE Class 10 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Changes, Reactions & Atmospheric Pollution questions and exercises with answers

Showing questions 31–50 of 50.

A singer's note makes a piano string sound without touching it. What is happening?Read the answer and worked solution →A sound has a period of 0.004 s. What is its frequency?Read the answer and worked solution →Why can sound not travel across a vacuum?Read the answer and worked solution →A sound is described as periodic. What does that say about the particles of the medium?Read the answer and worked solution →Sound reaches you faster through a steel rail than through the air. Why?Read the answer and worked solution →Two astronauts on the airless Moon cannot talk directly. Why?Read the answer and worked solution →A sound wave has a frequency of 35 kHz in air. It is calledRead the answer and worked solution →A sound wave is best defined asRead the answer and worked solution →Observing which phenomenon in a disturbance can be taken as support that the disturbance is a wave?Read the answer and worked solution →A source of sound moves forward. What happens to the wavelength ahead of it?Read the answer and worked solution →What is the natural frequency of a system?Read the answer and worked solution →What is resonance?Read the answer and worked solution →You drive an oscillating object far above its natural frequency. What happens to the amplitude?Read the answer and worked solution →An observer moves away from a stationary source of sound. What do they receive?Read the answer and worked solution →What is damping?Read the answer and worked solution →A vibrating guitar string makes a sound. What does it do to the surrounding air?Read the answer and worked solution →Why does the speed of sound in a gas change with temperature?Read the answer and worked solution →Two identical sirens sound, one on a parked car and one on a car speeding towards you. What differs?Read the answer and worked solution →Which frequency can a healthy young person hear?Read the answer and worked solution →A tuning fork vibrates 50 times each second. Its time period isRead the answer and worked solution →

Worked practice questions

A singer's note makes a piano string sound without touching it. What is happening?

  1. The string is being damped
  2. The string is refracting the note
  3. The string is resonating with the note
  4. The string is reflecting the note
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Correct answer: C. The string is resonating with the note

1. Sing into a piano with the sustain pedal down and it sings the same note back. 2. The strings sharing the frequency of the voice resonate in response to the sound waves. 3. That is resonance: driving a system at its own natural frequency. 4. Damping is the opposite process, in which the oscillation dies away. _Source: OpenStax Physics (high school, CC BY 4.0), Ch 14 "Sound", section Resonance and Beats_

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A sound has a period of 0.004 s. What is its frequency?

  1. 4 Hz
  2. 25 Hz
  3. 400 Hz
  4. 250 Hz
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Correct answer: D. 250 Hz

Frequency is the inverse of period, so 1 / 0.004 gives 250 Hz.

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Why can sound not travel across a vacuum?

  1. There is no matter there to disturb
  2. A vacuum is too cold for any sound
  3. Sound is absorbed by empty space
  4. A vacuum has too high a density
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Correct answer: A. There is no matter there to disturb

1. Sound is defined as a disturbance of matter passed outward from its source. 2. A disturbance of matter needs matter present to be disturbed. 3. A vacuum contains no matter, so there is nothing to carry the disturbance. 4. Sound therefore requires a medium, which is why space is silent. _Source: OpenStax Physics (high school, CC BY 4.0), Ch 14 "Sound", section Properties of Sound Waves_

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