Resistance of a carbon resistor determined from colour codes is \((22000 \pm 5 \%) ~\Omega\). The colour of third band must be:
1. Yellow
2. Red
3. Green
4. Orange
From NCERT
NEET - 2023
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The magnitude and direction of the current in the following circuit is:
            
1. \(1.5~\text{A}\) from \({B}\) to \({A}\) through \(E\)
2. \(0.2~\text{A}\) from \({B}\) to \({A}\) through \(E\)
3. \(0.5~\text{A}\) from \({A}\) to \({B}\) through \(E\)
4. \(\dfrac{5}{9}~\text{A}\) from \({A}\) to \({B}\) through \(E\)
Subtopic:  Kirchoff's Voltage Law |
 75%
From NCERT
NEET - 2023
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If the galvanometer \(G\) does not show any deflection in the circuit shown, the value of \(R\) is given by;
1. \(400~\Omega\) 2. \(200~\Omega\)
3. \(50~\Omega\) 4. \(100~\Omega\)
Subtopic:  Kirchoff's Voltage Law |
 55%
From NCERT
NEET - 2023
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\(10\) resistors, each of resistance \(R\) are connected in series to a battery of \(E\) and negligible internal resistance. Then those are connected in parallel to the same battery, the current is increased \(n\) times. The value of \(n\) is: 
1. \(1000\)
2. \(10\)
3. \(100\)
4. \(1\)
Subtopic:  Combination of Resistors |
 69%
From NCERT
NEET - 2023
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The resistance of platinum wire at \(0^{\circ} \text{C}\) is \(2~ \Omega\) and \(6.8~ \Omega\) at \(80^{\circ}\text{C}\). The temperature coefficient of resistance of the wire is:
1. \(3\times 10^{-1}~^\circ \text{C}^{-1}\)
2. \(3 \times 10^{-4}~^\circ \text{C}^{-1}\)
3. \(3 \times 10^{-3}~^\circ \text{C}^{-1}\)
4. \(3 \times 10^{-2}~^\circ \text{C}^{-1}\)
Subtopic:  Derivation of Ohm's Law |
 72%
From NCERT
NEET - 2023
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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium 
2. Silver
3. Glass
4. Silicon 
Subtopic:  Derivation of Ohm's Law |
 65%
From NCERT
NEET - 2023
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A certain wire \(A\) has resistance \(81~\Omega.\) The resistance of another wire \(B\) of the same material and equal length but of diameter thrice the diameter of \(A\) will be:
1. \(81~\Omega\) 2. \(9~\Omega\)
3. \(729~\Omega\) 4. \(243~\Omega\)
Subtopic:  Derivation of Ohm's Law |
 75%
From NCERT
NEET - 2023
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A copper wire of radius \(1\) mm contains \(10^{22}\) free electrons per cubic metre. The drift velocity for free electrons when \(10\) A current flows through the wire will be:
(Given, charge on electron = \(1.6\times10^{-19}\) C)
1. \(\dfrac{6.25\times10^4}{\pi}\) m/s 2. \(\dfrac{6.25}{\pi}\times10^3\) m/s
3. \(\dfrac{6.25}{\pi}\) m/s 4. \(\dfrac{6.25\times10^5}{\pi}\) m/s
Subtopic:  Current & Current Density |
 74%
From NCERT
NEET - 2023
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The emf of a cell having internal resistance \(1~ \Omega\) is balanced against a length of \(330~\text{cm}\) on a potentiometer wire. When an external resistance of \(2 ~\Omega\) is connected across the cell, the balancing length will be: 
1. \(220~\text{cm}\) 2. \(330~\text{cm}\)
3. \(115~\text{cm}\) 4. \(332~\text{cm}\)
From NCERT
NEET - 2023
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Two resistors of resistance, \(100~\Omega\) and \(200~\Omega\) are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in \(100~\Omega\) resistor to that in \(200~\Omega\) resistor in a given time is:
1. \(4:1\)
2. \(1:2\)
3. \(2:1\)
4. \(1:4\)
Subtopic:  Heating Effects of Current |
 70%
From NCERT
NEET - 2022
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