51. In household wiring, a mains circuit consists of
Answer: D. a live wire, a neutral wire and an earth wire
Physics Class 10 Unit 17: Electric Circuits MCQs
60 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 2 of 2.
Tap an option to check your answer.
52. The wire that carries the current from the power source to the appliance is the
Answer: B. live wire
53. The earth wire is a safety measure providing a
Answer: C. low-resistance path for current to the ground
54. A fuse contains a metal strip that
Answer: A. melts when the current is larger than the rated value
55. A circuit breaker
Answer: B. interrupts the flow of electricity in case of a fault
56. The purpose of grounding electrical systems is to
Answer: D. protect against electric shocks
57. If a live wire touches a metal case that is earthed, a large current flows and the
Answer: D. fuse blows or circuit breaker trips
58. An RCD or GFCI detects a difference in current between the
Answer: B. live and neutral wires
59. A GFCI interrupts the circuit when it detects a current difference of about
Answer: C. 5 milliamperes
60. A current of 20 to 30 mA through the body can make a person
Answer: A. unable to let go of the circuit
About Physics Class 10 Unit 17 MCQs (Federal Board)
These 60 Physics MCQs cover Class 10 Unit 17: Electric Circuits of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Electric Circuits notes for this chapter. Download the Electric Circuits MCQs as a PDF using the button at the top of this page.