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

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%

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

(1) $\frac{2}{3}V$

(2) $\frac{8}{9}V$

(3) $\frac{4}{3}V$

(4) 2 V

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

(1) $R>R_1+R_2$

(2) $R_1<R<R_2$

(3) $R_2<R<(R_1+R_2)$

(4) R < R₁

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

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

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

Equivalent resistance between A and B will be 

(1) 2 ohm

(2) 18 ohm

(3) 6 ohm

(4) 3.6 ohm

Referring to the figure below, the effective resistance of the network is 

(1) 2r

(2) 4r

(3) 10r

(4) 5r/2

Two resistances are joined in parallel whose resultant is $\frac{6}{8}$ ohm. One of the resistance wire is broken and the effective resistance becomes 2Ω. Then the resistance in ohm of the wire that got broken was 

(1) 3/5

(2) 2

(3) 6/5

(4) 3