Q. No.The resistance of a wire is \(R\) ohm. If it is melted and stretched to \(n\) times its original length, its new resistance will be:
| 1. | \(nR\) | 2. | \(\frac{R}{n}\) |
| 3. | \(n^2R\) | 4. | \(\frac{R}{n^2}\) |
Subtopic: Derivation of Ohm's Law |
83%
From NCERT
NEET - 2017
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
A wire made of a metal of uniform resistivity \(1.0\times 10^{-6}~\Omega{\text{-m}}\) is \(2.0~\text{m}\) long and has a diameter of \(2.0\times 10^{-3}~\text{m}.\). What is the electrical resistance of this length of the wire?
| 1. | \(\dfrac {2.0 ~\times~10^{-3}}{\pi} ~\Omega\) | 2. | \(5.0 ~\times~10^{-13}\pi~\Omega\) |
| 3. | \(\dfrac {1.0}{2\pi}~\Omega\) | 4. | \(\dfrac{2.0}{\pi}~\Omega\) |
Subtopic: Derivation of Ohm's Law |
82%
From NCERT
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Two solid conductors are made up of the same material and have the same length and the same resistance. One of them has a circular cross-section of area \( 𝐴 _1\) and the other one has a square cross-section of area \(A_2.\) The ratio of \(𝐴 _1 / 𝐴 _2 \) is:
| 1. | \(1.5\) | 2. | \(1\) |
| 3. | \(0.8\) | 4. | \(2\) |
Subtopic: Derivation of Ohm's Law |
83%
From NCERT
NEET - 2020
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
A wire of resistance \(4~\Omega\) is stretched to twice its original length. The resistance of a stretched wire would be:
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(16~\Omega\)
4. \(2~\Omega\)
1. \(4~\Omega\)
2. \(8~\Omega\)
3. \(16~\Omega\)
4. \(2~\Omega\)
Subtopic: Derivation of Ohm's Law |
84%
From NCERT
AIPMT - 2013
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
The specific resistance of a conductor increases with:
| 1. | increase in temperature. |
| 2. | increase in cross-section area. |
| 3. | increase in cross-section and decrease in length. |
| 4. | decrease in cross-section area. |
Subtopic: Derivation of Ohm's Law |
81%
From NCERT
AIPMT - 2002
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
The plot of current \(I~\text{(A)}\) flowing through a metallic conductor versus the applied voltage \(V~\text{(volt)}\) across the ends of a conductor is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Derivation of Ohm's Law |
80%
From NCERT
NEET - 2022
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
The current-voltage graph for a given metallic conductor at two different temperatures \(T_{1}\) and \(T_{2}\) is as shown in the figure. Then:
1. \(T_{1}=T_{2}\)
2. \(T_{2}>T_{1}\)
3. \(T_{1}>T_{2}\)
4. Insufficient information to conclude.
1. \(T_{1}=T_{2}\)
2. \(T_{2}>T_{1}\)
3. \(T_{1}>T_{2}\)
4. Insufficient information to conclude.
Subtopic: Derivation of Ohm's Law |
77%
From NCERT
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
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 |
65%
From NCERT
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Two metal wires of identical dimensions are connected in series. If \(\sigma_1~\text{and}~\sigma_2\)
| 1. | \(\frac{2\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\) | 2. | \(\frac{\sigma_1 +\sigma_2}{2\sigma_1\sigma_2}\) |
| 3. | \(\frac{\sigma_1 +\sigma_2}{\sigma_1\sigma_2}\) | 4. | \(\frac{\sigma_1 \sigma_2}{\sigma_1+\sigma_2}\) |
Subtopic: Derivation of Ohm's Law |
64%
From NCERT
NEET - 2015
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
Links
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Consider a thin rectangular sheet of side \(L,\) width \(b\) and thickness \(t,\) made of a material of resistivity \(\rho\). The resistance between two opposite faces, shown by the shaded areas in the figure is:
| 1. | directly proportional to \(b\) |
| 2. | inversely proportional to \(t\) |
| 3. | inversely proportional to \(L\) |
| 4. | both (1) and (2) |
Subtopic: Derivation of Ohm's Law |
66%
From NCERT
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
Hints
To view explanation, please take trial in the course.
NEET 2026 - Target Batch - Vital
© 2025 GoodEd Technologies Pvt. Ltd.