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دسویں جماعت · طبیعیات · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. Sound cannot travel through:

    • A A vacuum
    • B Steel
    • C Water
    • D Air

  2. The speed of sound in air at room temperature is about:

    • A 340 m/s
    • B 34 m/s
    • C 300000 km/s
    • D 3400 m/s

  3. The pitch of a sound depends on its:

    • A Amplitude
    • B Speed
    • C Frequency
    • D Medium only

  4. The loudness of a sound depends mainly on its:

    • A Amplitude
    • B Speed
    • C Wavelength
    • D Frequency

  5. An echo is heard when sound is:

    • A Reflected
    • B Refracted
    • C Diffracted
    • D Absorbed

  6. The audible range of human hearing is about:

    • A 20 kHz to 200 kHz
    • B 20 Hz to 20000 Hz
    • C 2 Hz to 200 Hz
    • D 200 Hz to 2 MHz

جوابی کلید

1. A, 2. A, 3. C, 4. A, 5. A, 6. B

  1. Sound needs a material medium to travel.

  2. It is about 340 m/s.

  3. Higher frequency gives a higher pitch.

  4. A larger amplitude gives a louder sound.

  5. An echo is reflected sound heard after the original.

  6. Humans hear roughly from 20 Hz to 20 kHz.