Current Electricity · JEE Main previous year questions

2017 6 questions

1. Q372017 · 9 Apr 2017 · Shift 1

   A uniform wire of length l and radius r has a resistance of $100\Omega$. It is recast into a wire of radius $\frac{r}{2}$. The resistance of new wire will be :

   1. A.$1600\Omega$
   2. B.$400\Omega$
   3. C.$200\Omega$
   4. D.$100\Omega$
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   Answer: A

2. Q552017 · 9 Apr 2017 · Shift 1
   
   1. A.${\mathrm{P}}_1>{\mathrm{P}}_2>{\mathrm{P}}_3$
   2. B.${\mathrm{P}}_1>{\mathrm{P}}_3>{\mathrm{P}}_2$
   3. C.${\mathrm{P}}_2>{\mathrm{P}}_1>{\mathrm{P}}_3$
   4. D.${\mathrm{P}}_3>{\mathrm{P}}_2>{\mathrm{P}}_1$
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   Answer: C

3. Q572017 · 9 Apr 2017 · Shift 1
   
   1. A.$\frac{33}{5}\Omega$
   2. B.$6\Omega$
   3. C.$7\Omega$
   4. D.$\frac{20}{3}\Omega$
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   Answer: D

4. Q552017 · 8 Apr 2017 · Shift 1
   
   1. A.$10$
   2. B.$10^{-6}$
   3. C.$10^6$
   4. D.$100$
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   Answer: B

5. Q562017 · 8 Apr 2017 · Shift 1
   
   1. A.Reading of ${\mathrm{A}}_1$ is 2 A
   2. B.Reading of ${\mathrm{A}}_1$ is 18 A
   3. C.Reading of V is 9 V
   4. D.Reading of V is 7 V
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   Answer: A

6. Q592017 · 8 Apr 2017 · Shift 1
   
   1. A.$\frac{l_1}{l_1+l_2}$
   2. B.$\frac{l_2}{l_2-l_1}$
   3. C.$\frac{l_1}{l_1-l_2}$
   4. D.$\frac{l_1}{l_2-l_1}$
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   Answer: D