The resistors of resistances 2 Ω, 4 Ω and 8 Ω are connected in parallel, then the equivalent resistance of the combination will be :

(1) $\frac{8}{7}\Omega$

(2) $\frac{7}{8}\Omega$

(3) $\frac{7}{4}\Omega$

(4) $\frac{4}{9}\Omega$ 

In the circuit, the potential difference across PQ will be nearest to 

(1) 9.6 V

(2) 6.6 V

(3) 4.8 V

(4) 3.2 V

Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be 

(1) 32

(2) 64

(3) 50

(4) 200

Equivalent resistance across terminals \(A\) and \(B\) will be:

Two wires of the same dimensions but resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is 

(1) ρ₁ + ρ₂

(2) $\frac{{\rho }_1+{\rho }_2}{2}$

(3) $\sqrt{{\rho }_1{\rho }_2}$

(4) $2({\rho }_1+{\rho }_2)$

A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be 

(1) 1/3 A

(2) 1 A

(3) 1.5 A

(4) 2 A

Find the equivalent resistance between the points a and b 

(1) 2 Ω

(2) 4 Ω

(3) 8 Ω

(4) 16 Ω

The potential difference between points A and B is:

         
1. 207 V
2. 407 V
3. 107 V
4. 0

In the circuit shown below, The reading of the voltmeter V is 

(1) 12 V

(2) 8 V

(3) 20 V

(4) 16 V

In the figure given the value of X resistance will be, when the p.d. between B and D is zero 

(1) 4 ohm

(2) 6 ohm

(3) 8 ohm

(4) 9 ohm