A potential divider is used to give outputs of \(2~\text{V}\) and \(3~\text{V}\) from a \(5~\text{V}\) source, as shown in the figure.

        

Which combination of resistances, from the ones given below, \(R_1, R_2, ~\text{and}~R_3\) give the correct voltages?
1. \({R}_1=1~\text{k} \Omega, {R}_2=1 ~\text{k} \Omega, {R}_3=2 ~\text{k} \Omega\)
2. \({R}_1=2 ~\text{k} \Omega, {R}_2=1~\text{k} \Omega, {R}_3=2~\text{k} \Omega\)
3. \({R}_1=1 ~\text{k} \Omega, {R}_2=2~ \text{k} \Omega, {R}_3=2~ \text{k} \Omega\)
4. \({R}_1=3~\text{k} \Omega, {R}_2=2~\text{k} \Omega, {R}_3=2~ \text{k} \Omega\)

Subtopic:  Combination of Resistors |
 79%
From NCERT
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For the given circuit, the value of the resistance in which the maximum heat is produced is:
          
1. \(2~\Omega\)
2. \(6~\Omega\)
3. \(4~\Omega\)
4. \(12~\Omega\)

Subtopic:  Heating Effects of Current |
 63%
From NCERT
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A charged particle having drift velocity of \(7.5\times10^{-4}~\text{ms}^{-1}\) in an electric field of \(3\times10^{-10}~\text{Vm}^{-1}\), has mobility of: 
1. \(2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
2. \(2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
3. \(2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)
4. \(2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}\)

Subtopic:  Current & Current Density |
 82%
From NCERT
NEET - 2020
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Two batteries, one of emf \(18~\text{V}\) and internal resistance \(2~\Omega\) and the other of emf \(12\) V and internal resistance \(1~\Omega\), are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)

           

1. \(14\) V
2. \(15\) V
3. \(18\) V
4. \(30\) V

Subtopic:  Grouping of Cells |
 78%
From NCERT
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Current through the \(2~\Omega\) resistance in the electrical network shown is:

      

1. zero 2. \(1\) A
3. \(3\) A 4. \(5\) A
Subtopic:  Grouping of Cells |
 77%
From NCERT
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The dependence of resistivity \((\rho)\) on the temperature \((T)\) of a semiconductor is, roughly, represented by:

1. 2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
 64%
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What is the reading of the voltmeter of resistance \(1200~\Omega\) connected in the following circuit diagram? 

         

1. \(2.5\) V

2. \(5.0\) V

3. \(7.5\) V

4. \(40\) V

Subtopic:  Combination of Resistors |
 67%
From NCERT
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A coil heating a bucket full of water raises the temperature by \(5^{\circ}\text{C}\) in \(2\) min. lf the current in the coil is doubled, what will be the change in the temperature of water in \(1\) min? (Assume no loss of heat to the surroundings)
1. \(10^{\circ}\text{C}\) 2. \(5^{\circ}\text{C}\)
3. \(20^{\circ}\text{C}\) 4. \(15^{\circ}\text{C}\)
Subtopic:  Heating Effects of Current |
 61%
From NCERT
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Power consumed in the given circuit is \(P_1\). On interchanging the position of \(3~\Omega\) and \(12~\Omega\) resistances, the new power consumption is \(P_2\). The ratio of \(\frac{P_2}{P_1}\) is:
     

1. \(2\) 2. \(1 \over 2\)
3. \(3 \over 5\) 4. \(2 \over 5\)
Subtopic:  Heating Effects of Current |
 68%
From NCERT
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The figure below shows a network of currents. The current \(i\) will be:

           

1. \(3~\text{A}\)
2. \(13~\text{A}\)
3. \(23~\text{A}\)
4. \(-3~\text{A}\)

Subtopic:  Kirchoff's Current Law |
 85%
From NCERT
PMT - 1995
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