Semiconductors & Communication · JEE Main previous year questions

2006 5 questions

1. Q832006 · 29 Apr 2006 · Shift 1

   If the ratio of the concentration of electrons to that of holes in a semiconductor is $\frac{7}{5}$ and the ratio of currents is $\frac{7}{4}$, then what is the ratio of their drift velocities?

   1. A.$\frac{5}{8}$
   2. B.$\frac{4}{5}$
   3. C.$\frac{5}{4}$
   4. D.$\frac{4}{7}$
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   Answer: C

2. Q862006 · 29 Apr 2006 · Shift 1
   
   1. A.$1.71\mathrm{A}$
   2. B.$2.00\mathrm{A}$
   3. C.$2.31\mathrm{A}$
   4. D.$1.33\mathrm{A}$
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   Answer: B

3. Q872006 · 29 Apr 2006 · Shift 1
   
   1. A.
   2. B.
   3. C.
   4. D.
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   Answer: D

4. Q892006 · 29 Apr 2006 · Shift 1
   
   1. A.All $E_c,E_g,E_v$ increase
   2. B.$E_c$ and $E_v$ increase, but $E_g$ decreases
   3. C.$E_c$ and $E_v$ decrease, but $E_g$ increases
   4. D.All $E_c,E_g,E_v$ decrease
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   Answer: B

5. Q932006 · 29 Apr 2006 · Shift 1

   In a common base mode of a transistor, the collector current is $5.488\mathrm{mA}$ for an emitter current of $5.60\mathrm{mA}$. The value of the base current amplification factor ($\beta$) will be

   1. A.49
   2. B.50
   3. C.51
   4. D.48
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   Answer: A