General Science Class 7

The number of vibrations produced by a vibrating body in a second is called?

1. Velocity
2. Amplitude
3. Frequency
4. Wavelength

The fundamental frequency of a guitar is string 220 Hz, the frequency of the second harmonic is?

1. 220 Hz
2. 440 Hz
3. 320 Hz
4. 620 Hz

Which of the following harmonics is two octaves higher in pitch than the fundamental?

1. Second
2. Third
3. Fourth
4. Fifth

The velocity of a wave is equal to:

1. Wavelength x Frequency
2. Wavelength / Frequency
3. Frequency / Wavelength
4. Wavelength + Frequency

Sound travels fastest in:

1. Air
2. Water
3. Diamond
4. Steel

Sound travels slowest in which one of the following?

1. Air
2. Water
3. Steel
4. Diamond

The speed of the sound in air is:

1. 143 m/s
2. 243 m/s
3. 343 m/s
4. 443 m/s

The speed of the sound in diamond is:

1. 6000 m/s
2. 12000 m/s
3. 9000 m/s
4. 15000 m/s

The characteristic of sound by which we can differentiate between shrill and grave sound is:

1. Loudness
2. Timbre
3. Tone
4. Pitch

The meaning of Echoes is:

1. Repeating sounds
2. Refracted sounds
3. Absorbed sounds
4. Amplified sounds