The current in 8 Ω resistance is (in the figure below):

   

1.  0.69 A
2.  0.92 A
3.  1.30 A
4.  1.6 A

If the power dissipated in 5 Ω is 20 W then the power dissipated in 4 Ω is:
   

1.  4 W

2. 6 W

3. 10 W 

4. 20 W

The value of R for which power in it is maximum is:

1. 3 Ω
2. 6 Ω
3. 12 Ω
4. 9 Ω

The terminal potential difference of a cell is greater than its emf when:

In India electricity is supplied for domestic use at 220 V. It is supplied at 110 V in the USA. If the resistance of a 60 W bulb for use in India is R, the resistance of a 60 W bulb for use in the USA will be:

1. 2R
2. R/4
3. R/2
4. R 

A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharges is 14 V. The "Watt hour" efficiency of the battery is:

1. 80%

2. 90%

3. 87.5%

4. 82.5% 

Five equal resistances each of resistance R are connected as shown in the figure below. A battery of V volts is connected between A and B. The current flowing in AFCEB will be:

1. V/R

2. V/2R

3. 2V/R

4. 3V/R

A 6-volt battery is connected to the terminals of a three-metre-long wire of uniform thickness and resistance of 100 ohms. The difference of potential between two points on the wire separated by a distance of 50 cm will be:

1. 3 V

2. 1 V

3. 1.5 V

4. 2 V

The specific resistance of a conductor increases with:

For a cell, the terminal potential difference is 2.2 V when the circuit is open and reduces to 1.8 V when the cell is connected to the resistance of R = 5 Ω. The internal resistance of cell (r) is:

1. \(\frac{10}{9}~ \Omega\)
2. \(\frac{9}{10}~ \Omega\)
3. \(\frac{11}{9}~ \Omega\)
4. \(\frac{5}{9}~ \Omega\)