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Q. No.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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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)
(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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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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On the basis of electrical conductivity, which one of the following material has the smallest resistivity?
1. Germanium
2. Silver
3. Glass
4. Silicon
1. Germanium
2. Silver
3. Glass
4. Silicon
Subtopic: Derivation of Ohm's Law |
65%
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. \(3 \times 10^{-2}~^\circ \text{C}^{-1}\)
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 |
73%
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. \(1\)
1. \(1000\)
2. \(10\)
3. \(100\)
4. \(1\)
Subtopic: Combination of Resistors |
69%
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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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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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
1. Yellow
2. Red
3. Green
4. Orange
From NCERT
NEET - 2023
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The sliding contact \(C\) is at one fourth of the length of the potentiometer wire (\(AB\)) from \(A\) as shown in the circuit diagram. If the resistance of the wire \(AB\) is \(R_0\), then the potential drop (\(V\)) across the resistor \(R\) is:
| 1. | \(\dfrac{4V_0R}{3R_0+16R}\) | 2. | \(\dfrac{4V_0R}{3R_0+R}\) |
| 3. | \(\dfrac{2V_0R}{4R_0+R}\) | 4. | \(\dfrac{2V_0R}{2R_0+3R}\) |
From NCERT
NEET - 2022
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