This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 3 Current Electricity – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. You are given n identical resistors each of resistance r ohm. First, they are connected in such a way that the possible minimum value of resistance is obtained. Then they are connected in a way to get maximum possible resistance. The ratio of minimum and maximum resistance obtained in these ways is ..... A) $\frac{1}{n}$. B) N. C) $n^2$. D) $\frac{1}{n^2}$. Show Answer Correct Answer: D) $\frac{1}{n^2}$. 2. What does the switch do in a circuit? A) It supplies the power. B) It carries electricity. C) It opens and closes the circuit. D) It is an insulator. Show Answer Correct Answer: C) It opens and closes the circuit. 3. IF THE LENGTH OF A WIRE IN INCREASED TO 2 TIMES BY STRETCHING, WHAT WILL BE NEW RESISTANCE? A) 2 TIMES OF INITIAL RESISTANCE. B) 1/2 TIMES OF INITIAL RESISTANCE. C) 4 TIMES OF INITIAL RESISTANCE. D) 9 TIMES OF INITIAL RESISTANCE. Show Answer Correct Answer: C) 4 TIMES OF INITIAL RESISTANCE. 4. An example of a power source for current electricity is a battery. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. If you increase the voltage of the source in a parallel circuit, what happens? A) Current decreases. B) Current increases. C) Electrons disappear. D) Bulbs get dimmer. Show Answer Correct Answer: B) Current increases. 6. When static charge is built up on the bottom of your shoes from rubbing them on the carpet, this is caused by A) Heat. B) Friction. C) Magnatisim. D) Electronic system failure. Show Answer Correct Answer: B) Friction. 7. Mobility is the ..... A) Ratio of electric field to the drift velocity. B) Product of drift velocity and relaxation tme. C) Ratio of drift velocity to the electric field. D) None of the above. Show Answer Correct Answer: C) Ratio of drift velocity to the electric field. 8. The temperature coefficient of resistance of a wire is 0.00125 per degree celsius . At 300 K temperature its resistance is 1 ohm. The resistance of the wire will be 2 ohm at: A) 1154 K. B) 1100 K. C) 1400 K. D) 1127 K. Show Answer Correct Answer: B) 1100 K. 9. A voltmeter must have A) Low resistance so that it does affect the current through the main circuit. B) High resistance so that it does affect the current through the resistor. C) Low resistance so that it does affect the voltage across the resistor. D) None of the above. Show Answer Correct Answer: B) High resistance so that it does affect the current through the resistor. 10. How does electric current flow? A) From lower charge to higher charge. B) From higher charge to lower charge. C) All the above. D) None of the above. Show Answer Correct Answer: B) From higher charge to lower charge. 11. What happens to the terminal voltage when a larger current is drawn from a cell? A) Becomes zero. B) Remains the same. C) Decreases. D) Increases. Show Answer Correct Answer: C) Decreases. 12. A resource that can be replaced when needed. A) Fossil Fuels. B) Nonrenewable Energy. C) Exhaustible Energy. D) Renewable Energy. Show Answer Correct Answer: D) Renewable Energy. 13. The inverse of conductivity is called A) Mobility. B) Resistivity. C) Permittivity. D) Coercivity. Show Answer Correct Answer: B) Resistivity. 14. Electricity is used to turn on lights, watch television, and charge cell phones. Electricity is made up of traveling through wires that are connected to a power source. A) Energy. B) Electrons. C) Protons. D) Radiation. Show Answer Correct Answer: B) Electrons. 15. Calculate resistance of an electric bulb which allows a 10 A current when connected to 220 V power source. [Use V = IR] A) 10 ohm. B) 12 ohm. C) 22 ohm. D) 32 ohm. Show Answer Correct Answer: C) 22 ohm. 16. Silver bracelet A) Conductor. B) Insulator. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductor. 17. How to you calculate the total resistance in a series circuit? A) R1 + R2+ R3. B) R1-R2-R3. C) 1/R1 + 1/R2 + 1/R3. D) R1 = R2 = R3. Show Answer Correct Answer: A) R1 + R2+ R3. 18. A piece of copper and another ofgermanium are cooled from roomtemperature to 80 K. The resistance of A) Each of them increases. B) Each of them decreases. C) Copper increases and germaniumdecreases. D) Copper decreases and germaniumincreases. Show Answer Correct Answer: D) Copper decreases and germaniumincreases. 19. The mathematical expression of Kirchhoff's first law is ..... A) $\sum_x^y$. B) $\sum_x^y$. C) $\sum_x^y$. D) None of the above. Show Answer Correct Answer: A) $\sum_x^y$. 20. Conventionally, the direction of the current is taken as A) The direction of flow of negative charge. B) The direction of flow of atoms. C) The direction of flow of molecules. D) The direction of flow of positive charge. Show Answer Correct Answer: D) The direction of flow of positive charge. 21. The force that pushes the electricity through a circuit is called ..... A) Resistance. B) Voltage. C) Current. D) Switch. Show Answer Correct Answer: B) Voltage. 22. What does an ammeter measure? A) Current. B) Voltage. C) Resistance. D) None of the above. Show Answer Correct Answer: A) Current. 23. Work done to move a change around the complete circuit is called. A) Emf. B) Voltage. C) Resistance. D) Current. Show Answer Correct Answer: A) Emf. 24. What do electric generators do A) Transform mechanical energy to electrical energy. B) Transform mechanical energy to sound. C) Transform electrical energy to mechanical energy. D) Transform electrical energy to potential energy. Show Answer Correct Answer: A) Transform mechanical energy to electrical energy. 25. What type of resistors obey Ohm's law? A) Non-ohmic resistors. B) Superconductors. C) Ohmic resistors. D) Variable resistors. Show Answer Correct Answer: C) Ohmic resistors. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 3 Current Electricity Quiz 1Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 2Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 3Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 4Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 5Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 6Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 7Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 9Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 10Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books