Laws of Motion & Friction · JEE Main previous year questions

2006 3 questions

1. Q422006 · 29 Apr 2006 · Shift 1

   A mass of $Mkg$ is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of $45^{\circ }$ with the initial vertical direction is

   1. A.$Mg(\sqrt{2}+1)$
   2. B.$Mg\sqrt{2}$
   3. C.$\frac{Mg}{\sqrt{2}}$
   4. D.$Mg(\sqrt{2}-1)$
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   Answer: D

2. Q522006 · 29 Apr 2006 · Shift 1

   A wire elongates by $lmm$ when a LOAD $W$ is hanged from it. If the wire goes over a pulley and two weights $W$ each are hung at the two ends, the elongation of the wire will be (in $mm$)

   1. A.$l$
   2. B.$2l$
   3. C.zero
   4. D.$l/2$
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   Answer: A

3. Q602006 · 29 Apr 2006 · Shift 1

   A string is stretched between fixed points separated by $75.0cm$. It is observed to have resonant frequencies of $420Hz$ and $315Hz$. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is

   1. A.$105Hz$
   2. B.$1.05Hz$
   3. C.$1050Hz$
   4. D.$10.5Hz$
   Show answer

   Answer: A