Current Electricity MCQ

Current Electricity MCQ Questions

• 1. What do you mean by electric current?
• 2. What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?
• 3. What is the principle behind thermocouple?
• 4. Why a potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF?
• 5. By increasing the temperature the resistance of a conductor __.
• 6. A circuit consists of a resistance R connected to n similar cells. If the current in the circuit is the same whether the cells are connected in series or in parallel then the internal resistance r of each cell is given by ___.
• 7. Which of the following is wrong? Resistivity of a conductor is ___.
• 8. Is Resistivity of a conductor is inversely proportional to temperature?
• 9. Resistivity of a conductor is independent of dimensions of conductor.
• 10. When there is an electric current through a conducting wire along its length, then an electric field must exist ___.
• 11. Combine three resistors 5 Q, 4.5 Q and 3 Q in such a way that the total resistance of this combination is maximum ___.
• 12. In parallel combination of n cells, we obtain ___.
• 13. An electric heater is connected to the voltage supply. After few seconds, current gets its steady value then its initial current will be ___.
• 14. In Joule’s heating law, when I and t are constant, if the H is taken along the y axis and I2 along the x axis, the graph is ___.
• 15. A Daniel cell is balanced on 125 cm length of a potentiometer wire. Now the cell is short-circuited by a resistance 2 ohm and the balance is obtained at 100 cm. The internal resistance of the Daniel cell is ___.
• 16. Electric pressure is also called ___.
• 17. What is the unit of electric current?
• 18. Which instrument is used to measure electric current?
• 19. A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of __.
• 20. One ampere of current represents one coulomb of electric charge moving past a specific point in one second.