Semiconductors & Communication · JEE Main previous year questions

2020 5 questions

1. Q492020 · 6 Sept 2020 · Shift 2· Numerical answer
   
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   Answer: 150

2. Q332020 · 3 Sept 2020 · Shift 1

   A balloon filled with helium ($32^{\circ }\mathrm{C}$ and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as

   1. A.Irreversible adiabatic
   2. B.Reversible adiabatic
   3. C.Irreversible isothermal
   4. D.Reversible isothermal
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   Answer: A

3. Q292020 · 3 Sept 2020 · Shift 2

   If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is : Planck's constant $h=6.63\times 10^{-34}\mathrm{J}\cdot \mathrm{s}$. Speed of light $c=3\times 10^{8}m/s$

   1. A.1.5 eV
   2. B.2.0 eV
   3. C.3.1 eV
   4. D.1.1 eV
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   Answer: C

4. Q482020 · 9 Jan 2020 · Shift 2· Numerical answer
   
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   Answer: 40

5. Q322020 · 8 Jan 2020 · Shift 2
   
   1. A.1/3
   2. B.1/2
   3. C.1/4
   4. D.2/3
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   Answer: C