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When we nibble at a rusk, we hear a nois...

When we nibble at a rusk, we hear a noise that is simply deafening. But for some reason, our neighbor makes hardly any noise though he is doing the same. Why ?

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The bones of our head are solid elastic bodies and as such are very good conductors of sound. In a denser medium, the sound is louder. When we nibble at the rusk , the weak sound so produced reaches the auditory nerves via the solid bones of the head (through bone conduction) and as such becomes very loud. But when our neighbour does the same thing, this weak sound has to travel through air and as such is faint.
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When we pick up a newspaper, a book, or an article, we come to our task with certain preconceptions and predispositions. We expect to find a specific piece of information or be presented with an argument or an analysis of something, say, the likelihood of recession in the next six months or the reasons why children can't read. We probably know a little about the book or article we are reading even before we start. There was, after all, some reason why we chose to read one piece of writing rather than another. Our expectations and predispositions may, however, blind us to what the article and its author is actually saying. If, for example, we are used to disagreeing with the author, we may see only what we expect to see and not what is actually there. Day after day in our routine pattern of life we expose ourselves to the same newspaper, the same magazine, even books by authors with the same perspectives. In order to reflect on our reading habits and improve our skills we need to break out of this routine, step back and look at what we are doing when we read. According to the author, which one of the following statements is not true?

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MTG IIT JEE FOUNDATION-SOUND-Exercise (Subjective Problems) Short Answer Type
  1. The sound of an explosion on the surface of a lake is heard by a boat...

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  2. The sound of an explosion on the surface of a lake is heard by a boat...

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  3. A large auditorium has a curved back. Explain.

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  4. Two waves are shown below. Which of the two corresponds to lower decib...

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  5. What is the difference between an echo and a reverberation ?

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  6. (a) A sound wave travelling in a medium is represented . (i) Which l...

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  7. A sound wave travelling in a medium is represented as shown in the fig...

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  8. (a) A sound wave travelling in a medium is represented . (i) Which l...

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  9. A big explosion on the moon cannot be heard on the earth because

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  10. Where is reverberation desirable and where is this to be avoided ?

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  11. A narrow sound pulse (for example, a short pip by a whistle) is sent a...

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  12. A narrow pulse (for example, a short pip by a whistle) is sent across ...

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  13. A snapshot is taken of a periodic wave travelling on a string as shown...

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  14. The frequency of a source of sound is 100 Hz. How many times does it v...

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  15. When we nibble at a rusk, we hear a noise that is simply deafening. Bu...

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  16. A sonar device on a submarine sends out a signal and receives an echo ...

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  17. Waves of higher frequencies are used for cleaning hard-to-reach places...

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  18. Waves of higher frequencies are used for cleaning hard-to-reach places...

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  19. Waves of higher frequencies are used for cleaning hard-to-reach places...

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  20. An observer notes that there is a 6 second interval between seeing a f...

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