Current Electricity · JEE Main previous year questions

2002 5 questions

1. Q1172002 · 27 Apr 2002 · Shift 1

   If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a

   1. A.low resistance in parallel
   2. B.high resistance in parallel
   3. C.high resistance in series
   4. D.low resistance in series
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   Answer: C

2. Q1202002 · 27 Apr 2002 · Shift 1
   
   1. A.$2\Omega$
   2. B.$6\Omega$
   3. C.$5\Omega$
   4. D.$4\Omega$
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   Answer: B

3. Q1272002 · 27 Apr 2002 · Shift 1

   The power factor of $AC$ circuit having resistance $(R)$ and inductance $(L)$ connected in series and an angular velocity $\omega$ is

   1. A.$R/\omega L$
   2. B.$R/(R^2+{\omega }^2{L}^2{)}^{1/2}$
   3. C.$\omega L/R$
   4. D.$R/(R^2-{\omega }^2{L}^2{)}^{1/2}$
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   Answer: B

4. Q1342002 · 27 Apr 2002 · Shift 1
   
   1. A.zero
   2. B.$RvB$
   3. C.$vBL/R$
   4. D.$vBL$
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   Answer: D

5. Q1402002 · 27 Apr 2002 · Shift 1

   By increasing the temperature, the specific resistance of a conductor and a semiconductor

   1. A.increases for both
   2. B.decreases for both
   3. C.increases, decreases
   4. D.decreases, increases
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   Answer: C