Other Physics · JEE Main previous year questions

2016 4 questions

1. Q422016 · 3 Apr 2016 · Shift 1

   A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is dipped vertically in water so that half of it is in water. The fundamental frequency of the air column is now :

   1. A.$2f$
   2. B.$f$
   3. C.$\frac{f}{2}$
   4. D.$\frac{3f}{4}$
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   Answer: B

2. Q522016 · 3 Apr 2016 · Shift 1
   
   1. A.$OR$
   2. B.$NAND$
   3. C.$NOT$
   4. D.$AND$
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   Answer: A

3. Q582016 · 3 Apr 2016 · Shift 1

   For a common emitter configuration, if $\alpha$ and $\beta$ have their usual meanings, the incorrect relationship between $\alpha$ and $\beta$ is :

   1. A.$\alpha =\frac{\beta }{1+\beta }$
   2. B.$\alpha =\frac{{\beta }^2}{1+{\beta }^2}$
   3. C.$\frac{1}{\alpha }=\frac{1}{\beta }+1$
   4. D.$\alpha =\frac{\beta }{1-{\beta }^2}$
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   Answer: B, D

4. Q592016 · 3 Apr 2016 · Shift 1

   Choose the correct statement :

   1. A.In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
   2. B.In amplitude modulation the frequency of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
   3. C.In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
   4. D.In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the frequency of the audio signal.
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   Answer: A