A resistance wire connected in the left gap of a meter bridge balances a \(10~\Omega\)  resistance in the right gap at a point which divides the bridge wire in the ratio \(3:2\). lf the length of the resistance wire is \(1.5~\text{m}\), then the length of \(1~\Omega\)  of the resistance wire will be:
1. \(1.0\times 10^{-1}~\text{m}\) 
2. \(1.5\times 10^{-1}~\text{m}\)
3. \(1.5\times 10^{-2}~\text{m}\)
4. \(1.0\times 10^{-2}~\text{m}\)

Subtopic:  Meter Bridge & Potentiometer |
 58%
From NCERT
NEET - 2020
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The colour code of resistance is given below:

The values of resistance and tolerance, respectively are:

1.  47 kΩ, 10%

2.  4.7 kΩ, 5%

3.  470 Ω, 5%

4.  470 kΩ, 5%

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
 70%
From NCERT
NEET - 2020
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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 |
 81%
From NCERT
NEET - 2020
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Which of the following graph represents the variation of resistivity (ρ) with temperature (\(T\)) for copper?

1. 2.
3. 4.
Subtopic:  Derivation of Ohm's Law |
 61%
From NCERT
NEET - 2020
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A storage battery of emf 8.0 V and internal resistance 0.5  is being charged by a 120 V dc supply using a series resistor of 15.5 . What is the terminal voltage of the battery during charging?

1. 11.5 V
2. 12 V
3. 13.3 V
4. 10 V

Subtopic:  EMF & Terminal Voltage |
 57%
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In a potentiometer arrangement, a cell of emf \(1.25\) V gives a balance point at \(35.0\) cm length of the wire. If the cell is replaced by another cell and the balance point shifts to \(63.0\) cm, then the emf of the second cell is:
1. \(1.27\) V
2. \(2.25\) V
3. \(3.27\) V
4. \(3.25\) V

Subtopic:  Meter Bridge & Potentiometer |
 82%
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Choose the correct alternative.

1. Alloys of metals usually have less resistivity than that of their constituent metals.
2. Alloys usually have much higher temperature coefficients of resistance than pure metals.
3. The resistivity of the alloy manganin is nearly independent with an increase of temperature.
4. The resistivity of a typical insulator (e.g., amber) is less than that of a metal by a factor of the order of  10 22 / 10 23 .
 

Subtopic:  Derivation of Ohm's Law |
 53%
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Given n resistors each of resistance R, what is the ratio of the maximum to minimum resistance?
1. \(\frac{1}{n}\)
2. \(n\)
3. \(\frac{1}{n^2}\)
4. \(n^2\)

Subtopic:  Combination of Resistors |
 79%
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Given the resistances of 1Ω, 2Ω, 3Ω, how will we combine them to get an equivalent resistance of (11/3):

1. 1Ω, 2Ω in parallel and the combination in series with 3Ω
2. 3Ω, 2Ω in parallel and the combination in series with 1Ω
3.  1Ω, 2Ω and 3Ω in parallel
4. 1Ω, 2Ω in series and the combination in parallel with 3Ω

Subtopic:  Combination of Resistors |
 75%
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The number density of free electrons in a copper conductor is 8.5×1028 m–3. How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of the cross-section of the wire is 2.0×10–6 m2 and it is carrying a current of 3.0 A.

1.\(2.7 \times10^{4}\) s
2.\(3.3 \times10^{4}\) s
3.\(2.0 \times10^{3}\) s
4.\(3.9 \times10^{3}\) s

Subtopic:  Current & Current Density |
 62%
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