1. A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly ? 1023 1018 1020 1016 Answer: 1020 Explanation: Q = ne and Q = It ? ne = It View Answer Discuss in Forum Report Question

 2. How many joules of electrical energy are transferred per second by a 6 V; 0.5 A Lamp ? 0.83 J/s 30 J/s 3 J/s 12 J/s Answer: 3 J/s Explanation: Electrical energy transferred per second, E = V x I x t = 6 V × 0.5 A × 1s = 3 J/s View Answer Discuss in Forum Report Question

 3. The free electrons of a metal ? Are free to escape through the surface Do not collide with each other Are free to move anywhere in the metal Do not collide with each other Answer: Are free to move anywhere in the metal Explanation: View Answer Discuss in Forum Report Question

 4. The current in a wire ? Does not depend on resistance and potential difference Depends only on the resistance of the wire Depends on both resistance and potential difference Depends only on the potential difference applied Answer: Depends on both resistance and potential difference Explanation: View Answer Discuss in Forum Report Question

 5. When there is an electric current passing through a wire, the particles moving are ? Ions Electrons Atoms Protons Answer: Electrons Explanation: View Answer Discuss in Forum Report Question

 6. What is the maximum resistance which can be made using five resistors each of 1/5 W ? 10 ohm 1 ohm 5 ohm 1/5 ohm Answer: 1 ohm Explanation: Series combination provide the maximum resistance. View Answer Discuss in Forum Report Question

 7. A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is true ? R2 > R3 > R1 R3 > R2 > R1 R1 > R2 > R3 R1 = R2 = R3 Answer: R3 > R2 > R1 Explanation: Current is inversely proportional to the resistance for the same potential. So higher resistance would allow less current to pass through its which is shown by R3 as I3 < I2 < I1 ? R3 >R2 > R1 View Answer Discuss in Forum Report Question

 8. The resistivity does not change if ? the temperature is changed both material and temperature are changed the material is changed the shape of the resistor is changed Answer: the shape of the resistor is changed Explanation: The resistivity does not change if the shape of resistor is changed because nature of material will remain same. View Answer Discuss in Forum Report Question

 9. A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross-section ? 2A 3A 3A/2 A/2 Answer: 2A Explanation: View Answer Discuss in Forum Report Question

 10. What is the maximum resistance which can be made using five resistors each of 1/5 ohm ? 1 ohm 5 ohm 10 ohm 1/5 ohm Answer: 1 ohm Explanation: The maximum resistance is obtained when resistors are connected in parallel combination. This equivalent resistance will be: Rs = n x R = 5 X 1/5 = 1ohm Rs = equivalent resistance for series combination. View Answer Discuss in Forum Report Question