1. Active elements in a circuit
Answer: A. can supply or generate energy
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 1 of 2.
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2. A component whose function is to provide a specified value of resistance is a
Answer: B. resistor
3. Resistors dissipate electrical energy as
Answer: C. heat
4. The resistance of a carbon resistor is indicated by
Answer: D. colour bands
5. The first two bands of a resistor represent
Answer: C. the significant figures
6. The fourth band, silver or gold, indicates the
Answer: D. tolerance
7. A resistor with bands green, blue, orange and gold has a resistance of
Answer: A. 56 kΩ ± 5 %
8. A resistor has first three bands brown, black and red. Its value is
Answer: B. 1 kΩ
9. A variable resistor used to regulate current in a circuit is called a
Answer: D. rheostat
10. A circuit that produces an output voltage that is a fraction of its input voltage is called a
Answer: B. potential divider
11. In a potential divider, the output voltage across R₂ is
Answer: A. V R₂/(R₁ + R₂)
12. If R₁ = R₂ in a potential divider, the output voltage is
Answer: C. half the input voltage
13. A thermistor is a resistor whose resistance varies significantly with
Answer: D. temperature
14. The resistance of an NTC thermistor ______ with increasing temperature.
Answer: B. decreases
15. The best metal for resistance thermometers (RTDs) is
Answer: A. platinum
16. The resistance of an LDR as light intensity increases
Answer: C. decreases
17. An LDR is used in
Answer: A. automatic lighting control
18. For resistors in series, the ______ is the same through each resistor.
Answer: B. current
19. The equivalent resistance in series is
Answer: C. R₁ + R₂ + R₃
20. Resistors of 10 Ω, 20 Ω and 30 Ω in series have equivalent resistance
Answer: D. 60 Ω
21. Resistors of 10 Ω, 20 Ω and 30 Ω in series across 20 V carry a current of
Answer: A. 0.333 A
22. In that series circuit (10 Ω, 20 Ω, 30 Ω, 20 V), the voltage across the 30 Ω resistor is about
Answer: B. 10 V
23. The equivalent resistance in parallel is given by
Answer: C. 1/Req = 1/R₁ + 1/R₂ + 1/R₃
24. Resistors of 5 Ω, 10 Ω and 15 Ω in parallel have equivalent resistance about
Answer: D. 2.73 Ω
25. Resistors of 8 Ω, 12 Ω and 18 Ω in parallel have equivalent resistance about
Answer: A. 3.789 Ω
26. Resistors of 5 Ω, 10 Ω and 15 Ω in parallel across 12 V: the current through the 5 Ω resistor is
Answer: B. 2.4 A
27. The total current in that parallel circuit (5 Ω, 10 Ω, 15 Ω across 12 V) is
Answer: D. 4.4 A
28. Two 4 Ω resistors are in parallel and in series with a 6 Ω resistor. The equivalent resistance is
Answer: C. 8 Ω
29. A wire of resistance R is divided into 10 equal parts connected in parallel. The equivalent resistance is
Answer: C. 0.01 R
30. In a parallel connection of two bulbs, if bulb A glows brighter than B, then the resistance
Answer: D. RA < RB
31. Series combination of emf sources is used to obtain
Answer: B. a higher voltage
32. Four 1.5 V, 2.5 Ah batteries in series give
Answer: A. 6.0 V, 2.5 Ah
33. In a parallel connection of identical emf sources, the equivalent emf is
Answer: A. equal to the emf of one source
34. Parallel combination of emf sources is used when we need
Answer: C. a higher ampere-hour value
35. Three 12 V, 2 Ah batteries in parallel give
Answer: B. 12 V, 6 Ah
36. When four cells each of 0.5 V are connected in parallel, the net emf is
Answer: D. 0.5 V
37. The number of 0.4 V cells in series needed to get 12 V is
Answer: D. 30
38. The electrical energy consumed in a device is given by
Answer: A. E = VIt
39. The electrical energy can also be written as
Answer: C. E = I²Rt
40. An iron working at 200 V draws 7 A for 1 hour. The energy it consumes is
Answer: B. 5.04 MJ
41. The formula for electric power is
Answer: C. P = IV
42. The SI unit of power is the
Answer: A. watt
43. The power consumption of a toaster of 19 Ω resistance at 200 V is about
Answer: D. 2100 W
44. A device of 10 Ω connected to 120 V consumes
Answer: B. 1440 W
45. A 100 Ω resistor of power rating 0.5 W connected to 10 V will dissipate
Answer: B. 1 W, and will be damaged
46. A 60 W bulb switched on for 5 hours consumes
Answer: D. 300 Wh
47. 1 kilowatt-hour equals
Answer: A. 3.6×106 J
48. A device rated 500 W operating for 2 hours consumes
Answer: C. 1 kWh
49. An air conditioner of 2200 W used 24 hours daily for 30 days consumes
Answer: A. 1584 kWh
50. The monthly cost of that air conditioner at Rs 25 per kWh is
Answer: C. Rs 39,600
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.