The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter, the change in the resistance of the wire will be :

(1) 300%

(2) 200%

(3) 100%

(4) 50%

Subtopic:  Derivation of Ohm's Law |
 55%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Express which of the following setups can be used to verify Ohm’s law 

(1)  
(2)
(3)
(4)
Subtopic:  Derivation of Ohm's Law |
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 × 1015 electrons are moving from right to left and 3.12 × 1015 protons are moving from left to right per sec. What is the electric current in the discharge tube and what is its direction :

(1) 1 mA towards the right

(2) 1 mA towards left

(3) 2 mA towards left

(4) 2 mA towards the right

Subtopic:  Current & Current Density |
 63%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then :

(1) The resistance will be doubled and the specific resistance will be halved

(2) The resistance will be halved and the specific resistance will remain unchanged

(3) The resistance will be halved and the specific resistance will be doubled

(4) The resistance and the specific resistance, will both remain unchanged

Subtopic:  Derivation of Ohm's Law |
 80%
From NCERT
PMT - 2004
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The following four wires are made of the same material and are at the same temperature. Which one of them has highest electrical resistance :

(1) Length = 50 cm, diameter = 0.5 mm

(2) Length = 100 cm, diameter = 1 mm

(3) Length = 200 cm, diameter = 2 mm

(4) Length = 300 cm, diameter = 3 mm

Subtopic:  Derivation of Ohm's Law |
 71%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

The potential difference between points A and B of the adjoining figure is

(1) 23V

(2) 89V

(3) 43V

(4) 2 V

Subtopic:  Combination of Resistors |
 57%
PMT - 1991
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

Two resistors of resistance R1 and R2 having R1 > R2 are connected in parallel. For equivalent resistance R, the correct statement is :

(1) R>R1+R2

(2) R1<R<R2

(3) R2<R<(R1+R2)

(4) R < R1

Subtopic:  Combination of Resistors |
 66%
From NCERT
PMT - 1978
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

A wire of resistance \(R\) is divided into \(10\) equal parts. These parts are connected in parallel, the equivalent resistance of such connection will be:
1. \(0.01R\)
2. \(0.1R\)
3. \(10R\)
4. \(100R\)

Subtopic:  Combination of Resistors |
 64%
From NCERT
PMT - 1973
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be 

(1) 4/3 ohm

(2) 3/4 ohm

(3) 3 ohm

(4) 6 ohm

Subtopic:  Combination of Resistors |
 83%
From NCERT
PMT - 1983
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

There are n similar conductors each of resistance R. The resultant resistance comes out to be x when connected in parallel. If they are connected in series, the resistance comes out to be :

(1) x/n2

(2) n2x

(3) x/n

(4) nx

Subtopic:  Combination of Resistors |
 80%
From NCERT
PMT - 2004
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch