Science Class 8 Test Paper From Sound
Marks: 56 1/2 Time: 1 hour
Answer according to the marks of the question:
Q 1: How is sound produced? (1 mark)
Q 2: Which part of sitar produces sound? (1 mark)
Q 3: In humans, when is sound produced? (1 mark)
Q 4: Which part of a drum helps in making sound? (1 mark)
Q 5: What is larynx in human beings? (1 mark)
Q 6: How much long the vocal cords of a man are? (1 mark)
Q 7: What is the length of vocal cords of women? (1 mark)
Q 8: Write the mediums in which the sound travels. (1 and a half mark)
Q 9: Can sound travel through vacuum? Why? (2 marks)
Q 10: How do dolphins and whales communicate in water? (1 mark)
Q 11: Can sound travel through a gas? Give one example in support. (2 marks)
Q 12: Why sound cannot be heard on the surface of moon? (1 mark)
Q 13: How much is the speed of sound in air? (1 mark)
Q 14: Out of solids, liquids and gases in which medium the sound travels fastest and in which slowest?
(2 marks)
Q 15: What is the speed of light in air? (1 mark)
Q 16: Why do we see the flash of lightning first and then hear thunder later? (2 marks)
Q
17: When we put our ear to a railway line, we can hear the sound of an
approaching train even when the train is far off but its sound cannot be
heard through air. Why? (2 marks)
Q 18: Why we should not put anything like pin, pencil pr pen etc. inside our ears? (1 mark)
Q 19: What is amplitude? (1 mark)
Q 20: Define vibration. (1 mark)
Q 21: What is time period? What is its unit? (1 mark)
Q 22: What is frequency and what is its unit? (1 mark)
Q 23: A pendulum makes 15 oscillations in 5 seconds. What is the frequency of the pendulum? (2 marks)
Q 24: What is the time-period of a pendulum which is vibrating with a frequency of 10 hertz? (2 marks)
Q 25: Greater the ___________, louder the sound will be. (1 mark)
Q 26: What is the relation between loudness and amplitude (in terms of formula). (1 mark)
Q 27: What is the unit for loudness of sound? (1 mark)
Q 28: How much is the loudness of sound produced by a very noisy factory? (1 mark)
Q 39: What is pitch of a sound? (1 mark)
Q 40: Above what sound level, sound hurts too much? (1 mark)
Q 41: A bird say a crow makes a _____ pitched sound whereas a lion makes a ______ pitched sound.
(2 marks)
Q 42: Define quality of a sound. (1 mark)
Q 43: What are infrasonics and ultrasonics? (2 marks)
Q 44: Write two uses of ultrasound. (2 marks)
Q 45: Define noise and music. (2 marks)
Q
46: Write one example each of stringed musical instrument, wind musical
instrument, membrane type musical instrument and plate type musical
instrument. (4 marks)
Q 47: What is noise pollution and two sources of it? (3 marks)
Q 48: Write three measures to control noise pollution. (3 marks)
