This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 3 Current Electricity – Quiz 52 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 3 Current Electricity Quiz 52 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When current running through a wire is placed in the field of a permanent magnet, A) Solar energy is transformed into light. B) Electrical energy is transformed into sound. C) Solar energy is transformed into mechanical energy. D) Electrical energy is transformed into mechanical energy. Show Answer Correct Answer: D) Electrical energy is transformed into mechanical energy. 2. The part of a circuit that helps maintain a current flow by maintaining a p.d. A) Switch. B) Battery. C) Ammeter. D) Resistance. Show Answer Correct Answer: B) Battery. 3. In a meter bridge experiment the ratio of left gap resistance to right gap resistance is 2:3. The balance point from left is A) 20cm. B) 40cm. C) 50cm. D) 60cm. Show Answer Correct Answer: B) 40cm. 4. Protons have a negative charge and electrons have a positive charge. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. ..... provide low resistance so electrons move easily. A) Conductors. B) Insulators. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductors. 6. If current through a cross-section varies with time as i = (a + bt) where a and b are constant, then average current through the cross-section in time t$_{1}$ = 0 to t$_{2}$ = 2 sec is A) (a + 2b). B) (2a + b). C) (a + $\frac{b}{2}$. D) (a + b). Show Answer Correct Answer: D) (a + b). 7. Which of the following materials is commonly used as a core in an electromagnet to enhance its magnetic field? A) Plastic. B) Wood. C) Iron. D) Glass. Show Answer Correct Answer: C) Iron. 8. Measured in ohms. A) Voltage. B) Current. C) Resistance. D) None of the above. Show Answer Correct Answer: C) Resistance. 9. 1 ampere = 1 coulumb per ..... A) Minute. B) Second. C) Hour. D) Time. Show Answer Correct Answer: B) Second. 10. Two wires of equal length and equal diameter and having resistivities $\rho_1$ $\rho_2$ A) $\rho_1+\rho_2$. B) $\frac{\rho_1+\rho_2}{2}$. C) $\frac{\rho_1\rho_2}{\rho_1+\rho_2}$. D) $\sqrt{\rho_1\rho_2}$. Show Answer Correct Answer: B) $\frac{\rho_1+\rho_2}{2}$. 11. An example of an electromagnet A) Water bottle. B) Paper. C) Motor. D) Glass. Show Answer Correct Answer: C) Motor. 12. When 2 resistances P and Q are kept in the left and right gaps of a meter bridge, the null point is obtained at 60 cm. If P is shunted by a resistance equal to half of its value, the shift in null point is A) 10 cm to the left. B) 10cm to the right. C) 26.7 cm to the left. D) 26.7 cm to right. Show Answer Correct Answer: C) 26.7 cm to the left. 13. A given copper wire is stretched to reduce its diameter to half its previous value. What would be its new resistance? A) 16 R. B) NO CHANGE. C) 1/16 OHM. D) 4 OHM. Show Answer Correct Answer: A) 16 R. 14. If the potential difference across a resistor is doubled: A) Only the current is doubled. B) Only the current is halved. C) Only the resistance is doubled. D) Only the resistance is halved. Show Answer Correct Answer: A) Only the current is doubled. 15. Fill in the blank: ..... electricity exists when charges are able to freely flow. A) Static. B) Current. C) Discharge. D) Friction. Show Answer Correct Answer: B) Current. 16. The ..... resistance of a wire, the better it conducts electricity. A) More. B) Less. C) All the above. D) None of the above. Show Answer Correct Answer: B) Less. 17. Velocity of fluid increases where the pressure is: A) Low. B) High. C) Constant. D) Zero. Show Answer Correct Answer: A) Low. 18. Which of these forces works only by combining electric and magnetic forces? A) Magnetic. B) Electric. C) Electromagnetism. D) None of the above. Show Answer Correct Answer: C) Electromagnetism. 19. Which statement best describes a difference between static electricity and current electricity? A) Static electricity is human-harnessed energy while current electricity is natural energy. B) Static electricity is created energy while current electricity is spent energy. C) Static electricity is natural energy while current electricity is human-harnessed energy. D) Static electricity is positive energy while current electricity is negative energy. Show Answer Correct Answer: C) Static electricity is natural energy while current electricity is human-harnessed energy. 20. Any type of object through which an electric current cannot flow A) Conductor. B) Insulator. C) All the above. D) None of the above. Show Answer Correct Answer: B) Insulator. 21. In a circuit, if the voltage is increased and the resistance stays the same, current will ..... A) Increase, because voltage and current are directly proportional. B) Decrease, because voltage and current are directly proportional. C) Decrease, because voltage and current are indirectly proportional. D) Increase, because voltage and current are indirectly proportional. Show Answer Correct Answer: A) Increase, because voltage and current are directly proportional. 22. What is the role of a resistor in an electric circuit? A) To increase the current. B) To decrease the current. C) To store energy. D) To convert energy. Show Answer Correct Answer: B) To decrease the current. 23. How much charge must pass by a point in 10 s for the current to be 0.50 A? A) 0, 05C. B) 5, 0C. C) 20C. D) 2, 0C. Show Answer Correct Answer: B) 5, 0C. 24. Complete the sentence:An ammeter is a device that measures A) Voltage. B) Charge. C) Current. D) Resistance. Show Answer Correct Answer: C) Current. 25. When a potential difference V is applied accross conductor at a temprature T, the drift velocity of electron is propotional to A) $\sqrt[]{V}$. B) V. C) T. D) $\sqrt[]{T}$. Show Answer Correct Answer: B) V. ← 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