Semiconductors & Communication · JEE Main previous year questions

2005 3 questions

1. Q782005 · 28 Apr 2005 · Shift 1

   A particle is moving eastwards with a velocity of $5m/s$. In $10$ seconds the velocity changes to $5m/s$ northwards. The average acceleration in this time is

   1. A.$\frac{1}{2}\mathrm{m}{\mathrm{s}}^{-2}$ towards north
   2. B.$\frac{1}{\sqrt{2}}\mathrm{m}{\mathrm{s}}^{-2}$ towards north-east
   3. C.$\frac{1}{\sqrt{2}}\mathrm{m}{\mathrm{s}}^{-2}$ towards north-west
   4. D.zero
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   Answer: C

2. Q1392005 · 28 Apr 2005 · Shift 1

   The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $2480\mathrm{nm}$ is incident on it. The band gap in $(eV)$ for the semiconductor is

   1. A.$2.5\mathrm{eV}$
   2. B.$1.1\mathrm{eV}$
   3. C.$0.7\mathrm{eV}$
   4. D.$0.5\mathrm{eV}$
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   Answer: D

3. Q1502005 · 28 Apr 2005 · Shift 1

   In a common base amplifier, the phase difference between the input signal voltage and output voltage is

   1. A.$\pi$
   2. B.$\frac{\pi }{4}$
   3. C.$\frac{\pi }{2}$
   4. D.$0$
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   Answer: D