Waves & Sound · JEE Main previous year questions

2005 2 questions

1. Q1092005 · 28 Apr 2005 · Shift 1

   When two tuning forks (fork 1 and fork 2) are sounded simultaneously, $4$ beats per second are heated. Now, some tape is attached on the prong of the fork 2. When the tuning forks are sounded again, $6$ beats per second are heard. If the frequency of fork 1 is $200\mathrm{Hz}$, then what was the original frequency of fork 2 ?

   1. A.$202\mathrm{Hz}$
   2. B.$200\mathrm{Hz}$
   3. C.$204\mathrm{Hz}$
   4. D.$196\mathrm{Hz}$
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   Answer: D

2. Q1452005 · 28 Apr 2005 · Shift 1

   An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency ?

   1. A.$0.5\%$
   2. B.$\mathrm{zero}$
   3. C.$20\%$
   4. D.$5\%$
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   Answer: C