Current Electricity · JEE Main previous year questions

2019 39 questions

1. Q452019 · 12 Jan 2019 · Shift 1
   
   1. A.$6\mathrm{A}$
   2. B.$7.5\mathrm{A}$
   3. C.$3\mathrm{A}$
   4. D.$5.5\mathrm{A}$
   Show answer

   Answer: A

2. Q512019 · 12 Jan 2019 · Shift 1
   
   1. A.$\bar{A}B$
   2. B.$AB+\overline{AB}$
   3. C.$A\bar{B}+\bar{A}B$
   4. D.$A\bar{B}$
   Show answer

   Answer: D

3. Q532019 · 12 Jan 2019 · Shift 1
   
   1. A.$0.3\mathrm{m}$
   2. B.$0.25\mathrm{m}$
   3. C.$0.35\mathrm{m}$
   4. D.$0.2\mathrm{m}$
   Show answer

   Answer: B

4. Q592019 · 12 Jan 2019 · Shift 1

   An ideal battery of $4\mathrm{V}$ and resistance R are connected in series in the primary circuit of a potentiometer of length $1\mathrm{m}$ and resistance $5\Omega$. The value of R, to give a potential difference of $5\mathrm{mV}$ across $10\mathrm{cm}$ of potentiometer wire, is :

   1. A.$480\Omega$
   2. B.$495\Omega$
   3. C.$490\Omega$
   4. D.$395\Omega$
   Show answer

   Answer: D

5. Q332019 · 12 Jan 2019 · Shift 2

   A galvanometer, whose resistance is 50 ohm, has 25 divisions in it. When a current of $4\times 10^{-4}\mathrm{A}$ passes through it, its needle ( pointer) deflects by one division. To use this galvanometer as a voltmeter of range 2.5 V, it should be connected to a resistance of :

   1. A.$200\mathrm{ohm}$
   2. B.$250\mathrm{ohm}$
   3. C.$6200\mathrm{ohm}$
   4. D.$6250\mathrm{ohm}$
   Show answer

   Answer: A

6. Q402019 · 12 Jan 2019 · Shift 2
   
   1. A.$1.1\mathrm{A},-0.4\mathrm{A},0.4\mathrm{A}$
   2. B.$-0.4\mathrm{A},0.4\mathrm{A},1.1\mathrm{A}$
   3. C.$0.4\mathrm{A},1.1\mathrm{A},0.4\mathrm{A}$
   4. D.$1.1\mathrm{A},0.4\mathrm{A},0.4\mathrm{A}$
   Show answer

   Answer: D

7. Q462019 · 11 Jan 2019 · Shift 2

   A galvanometer having a resistance of $20\Omega$ and 30 divisions on both sides has figure of merit $0.005\text{ ampere/division}$. The resistance that should be connected in series such that it can be used as a voltmeter upto 15 volt, is:

   1. A.$120\Omega$
   2. B.$125\Omega$
   3. C.$80\Omega$
   4. D.$100\Omega$
   Show answer

   Answer: C

8. Q552019 · 11 Jan 2019 · Shift 2
   
   1. A.$6\text{ V}$
   2. B.$3\text{ V}$
   3. C.$2\text{ V}$
   4. D.$1\text{ V}$
   Show answer

   Answer: C

9. Q562019 · 11 Jan 2019 · Shift 2
   
   1. A.0.027
   2. B.0.030
   3. C.0.036
   4. D.0.020
   Show answer

   Answer: D

10. Q582019 · 11 Jan 2019 · Shift 2
    
    1. A.$40\Omega$
    2. B.$30\Omega$
    3. C.$20\Omega$
    4. D.$60\Omega$
    Show answer

    Answer: D

11. Q362019 · 9 Jan 2019 · Shift 1
    
    1. A.$3\text{ A}$
    2. B.$5\text{ A}$
    3. C.$4\text{ A}$
    4. D.$2\text{ A}$
    Show answer

    Answer: B

12. Q372019 · 9 Jan 2019 · Shift 1

    A conducting circular loop made of a thin wire, has area $3.5\times 10^{-3}{\text{ m}}^2$ and resistance $10\Omega$. It is placed perpendicular to a time dependent magnetic field $B(t)=(0.4\text{T})\sin (50\pi t)$. The field is uniform in space. Then the net charge flowing through the loop during $t=0\text{ s}$ and $t=10\text{ ms}$ is close to :

    1. A.$0.14\text{ mC}$
    2. B.$0.7\text{ mC}$
    3. C.$0.21\text{ mC}$
    4. D.$0.6\text{ mC}$
    Show answer

    Answer: A

13. Q452019 · 9 Jan 2019 · Shift 1

    A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is :

    1. A.2.0 %
    2. B.2.5 %
    3. C.1.0 %
    4. D.0.5 %
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    Answer: C

14. Q592019 · 9 Jan 2019 · Shift 1
    
    1. A.$270\Omega ,10\%$
    2. B.$27\text{ k}\Omega ,10\%$
    3. C.$27\text{ k}\Omega ,20\%$
    4. D.$270\Omega ,5\%$
    Show answer

    Answer: B