What is the resistance of a carbon resistance which has bands of colours brown, black and brown 

(1) 100 Ω

(2) 1000 Ω

(3) 10 Ω

(4) 1 Ω

Concept Questions :-

Colour coding of resistors
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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

Concept Questions :-

Derivation of Ohm's law
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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

Concept Questions :-

Derivation of Ohm's law
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The colour sequence in a carbon resistor is red, brown, orange and silver. The resistance of the resistor is 

1. 21 × 103 ± 10%

2. 23 × 101 ± 10

3. 21 × 103 ± 5%

4. 12 × 103 ± 5%

Concept Questions :-

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

(1) 23V

(2) 89V

(3) 43V

(4) 2 V

Concept Questions :-

Combination of resistors
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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

Concept Questions :-

Combination of resistors
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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) 0.01 R

(2) 0.1 R

(3) 10 R

(4) 100 R

Concept Questions :-

Combination of resistors
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The current in the adjoining circuit will be 

(1) 145ampere

(2) 115ampere

(3) 110ampere

(4) 15ampere

Concept Questions :-

Combination of resistors
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The reading of the ammeter as per figure shown is

(1) 18A

(2) 34A

(3) 12A

(4) 2 A

Concept Questions :-

Combination of resistors
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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

Concept Questions :-

Combination of resistors
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Difficulty Level: