This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 3 Current Electricity – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The property of a conductor by which it obstructs the flow of current is known as ..... of the conductor A) Voltage. B) Conductivity. C) Power. D) Resistance. Show Answer Correct Answer: D) Resistance. 2. ..... allows electricity to flow. A) A conductor. B) An insulator. C) A magnet. D) None of the above. Show Answer Correct Answer: A) A conductor. 3. What does the current in a wire tell you? A) The speed of electron flow through it. B) How tough it is for electrons to flow through it. C) The amount of energy given to the electrons. D) The amount of energy taken away from the electrons. Show Answer Correct Answer: A) The speed of electron flow through it. 4. True or False:A switch turns a circuit on or off. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. If the battery produced 12.6 Volts what would be the current flow for a 6 Ohm resistor? A) 2.1 Amps. B) 2.4 Amps. C) 1.71 Amps. D) 15 Amps. Show Answer Correct Answer: A) 2.1 Amps. 6. Resistance in an electric wire is A) Directly proportional to length of wire. B) Inversely proportional to length of wire. C) All the above. D) None of the above. Show Answer Correct Answer: A) Directly proportional to length of wire. 7. As earth's magnetic poles move what happens to the magnetic declination of a given location A) It will always remain constant. B) It will return to zero. C) It will change. D) It will always double. Show Answer Correct Answer: C) It will change. 8. What makes an electromagnet stronger? A) Greater number of loops. B) Smaller number of loops. C) Decreasing the current. D) Decreasing the voltage. Show Answer Correct Answer: A) Greater number of loops. 9. The mobility of free electrons in a metal is proportional to A) $\frac{e}{m}\tau$. B) $\frac{e}{m\tau}$. C) $\frac{m}{e\tau}$. D) $\frac{m}{e}\tau$. Show Answer Correct Answer: A) $\frac{e}{m}\tau$. 10. What is the power consumed by a lamp whose current is 6.0 A and the lamp has a resistance of 4.0 ohms? A) 144 W. B) 120 W. C) 24 W. D) 1.5 W. Show Answer Correct Answer: A) 144 W. 11. When seen from below, the blades of a ceiling fan are seen to be revolving anticlockwise and their speed is decreasing. Select correct statement about the directions of its angular velocity and angular acceleration. A) Angular velocity upwards, angular acceleration downwards. B) Angular velocity downwards, angular acceleration upwards. C) Both angular velocity and angular acceleration upwards. D) Both angular velocity and angular acceleration downwards. Show Answer Correct Answer: A) Angular velocity upwards, angular acceleration downwards. 12. On increasing the temperature of a conductor, its resistance increases because the A) Relaxation time increases. B) Relaxation time decreases. C) Electron density decreases. D) Relaxation time remains constant. Show Answer Correct Answer: B) Relaxation time decreases. 13. V=IR is representation of what? A) Ohm's law. B) Coulomb's law. C) Newton's law. D) None of the above. Show Answer Correct Answer: A) Ohm's law. 14. The terminal potential of a cell is greater than its emf when it is A) Being discharged. B) Open circuit. C) Being charged. D) Being either charged or discharged. Show Answer Correct Answer: C) Being charged. 15. What boosts the voltage of an electric current? A) Wires. B) Step-up transformer. C) Step-down transformer. D) Transformer. Show Answer Correct Answer: B) Step-up transformer. 16. What does a switch do for a circuit? A) It keeps the circuit closed. B) It makes the circuit opened or closed. C) It keeps the circuit on. D) It does not help the circuit. Show Answer Correct Answer: B) It makes the circuit opened or closed. 17. An arc lamp operates at 80V, 10A. Suggest a method to use it with a 240 V d.c. source. Calculate the value of the electric component required for this purpose A) 16 Ohm. B) 60 ohm. C) 6 0hm. D) None of the above. Show Answer Correct Answer: A) 16 Ohm. 18. In Meter Bridge when P is kept in left gap, Q is kept in right gap, the balancing length is 40cm. If Q is shunted by 10, the balance point shifts by 10cm. Resistance Q is ..... A) 8 ohm. B) 5 ohm. C) 10 ohm. D) 6 ohm. Show Answer Correct Answer: B) 5 ohm. 19. What is the purpose of the rheostat in the electric circuit used to verify Ohm's law? A) To measure the potential difference. B) To measure the current. C) To adjust the current. D) To adjust the resistance. Show Answer Correct Answer: D) To adjust the resistance. 20. Calculate the amount of charge that would flow in 1 hour through the element of an electric bulb drawing a current of 0.2 A. [Use I = Q/t] A) 300 C. B) 320 C. C) 700 C. D) 720 C. Show Answer Correct Answer: D) 720 C. 21. Which best describes a series circuit? A) It has two light bulbs. B) The same current flows through both light bulbs. C) It uses a single battery. D) The current is divided between the light bulbs. Show Answer Correct Answer: B) The same current flows through both light bulbs. 22. Sometimes the north and south poles of atoms in a material will line up. What is the term for the region where this occurs? A) Domain. B) Ferromagnetic. C) Magnetic field. D) Magnetic pole. Show Answer Correct Answer: A) Domain. 23. What is the main difference between conductors and insulators? A) Insulators are positively charged and conductors are negatively charged. B) Electrical currents move through conductors better than insulators. C) Electrical currents move through insulators better than conductors. D) Conductors have a neutral charge and insulators have a negative charge. Show Answer Correct Answer: B) Electrical currents move through conductors better than insulators. 24. The amount of energy in the circuit, the push. A) Voltage. B) Current. C) Resistance. D) None of the above. Show Answer Correct Answer: A) Voltage. 25. Which of these objects is an insulator? A) Copper Wire. B) Paper Clip. C) Steel Pole. D) Rubber Gloves. Show Answer Correct Answer: D) Rubber Gloves. ← 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 8Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 9Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books