1. The formula for electric current is
Answer: A. I = Q/Δt
Physics Class 10 Unit 16: Current Electricity MCQs
63 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. The SI unit of electric current is the
Answer: B. ampere
3. One ampere is the current when ______ of charge flows through a cross-section in one second.
Answer: D. one coulomb
4. The assumed direction of flow of positive charges from the positive to the negative terminal of a battery is called
Answer: C. conventional current
5. The directions of actual current and conventional current are
Answer: B. opposite to each other
6. A battery charged at 10 A for 2 hours receives a charge of
Answer: A. 72,000 C
7. 1 Ah is equal to
Answer: D. 3600 C
8. A 200 Ah battery is charged with a current of 25 A. The time required is
Answer: C. 8 hours
9. If 3 A of current flows for 2 minutes, the charge crossing a cross-section is
Answer: D. 360 C
10. A current of 1 mA passes through a wire. The number of electrons passing a point in 10 s is
Answer: C. 6.25×1016
11. Direct current (DC) flows
Answer: B. in one fixed direction
12. Alternating current (AC) changes its direction
Answer: A. continuously
13. The difference of electric potential between two points is called
Answer: D. potential difference
14. The formula for potential difference is
Answer: C. V = W/q
15. The SI unit of potential difference is the
Answer: B. volt
16. One volt is equal to
Answer: A. one joule per coulomb
17. The energy supplied by a battery per unit positive charge is called
Answer: B. electromotive force (emf)
18. The SI unit of emf is the
Answer: A. volt
19. An emf source is a device which converts
Answer: C. non-electrical energy into electrical energy
20. The mathematical form of Ohm's law is
Answer: D. V = IR
21. Devices that obey Ohm's law are called
Answer: B. ohmic devices
22. Which of the following is a non-ohmic device?
Answer: C. Diode
23. Which of the following is an ohmic device?
Answer: A. Copper wire
24. A torch bulb uses two 1.5 V cells in series and has a resistance of 20 Ω. The current is
Answer: D. 0.15 A
25. A device connected to a 12 V battery allows a current of 200 mA. Its resistance is
Answer: A. 60 Ω
26. A 12.0 V emf source is connected to a bulb through which 2.0 A flows. The resistance of the bulb is
Answer: D. 6 Ω
27. A voltage of 5000 V is needed to pass 50 A through a resistance of
Answer: B. 100 Ω
28. The current through a resistor is 0.5 A at 6.0 V. At 9.0 V, the current is
Answer: C. 0.75 A
29. Resistance is the
Answer: A. opposition to the flow of charges
30. The SI unit of resistance is the
Answer: D. ohm
31. The resistance of a wire is directly proportional to its
Answer: B. length
32. The resistance of a wire is inversely proportional to its
Answer: C. cross-sectional area
33. If a wire's length is doubled (same area), its resistance becomes
Answer: D. double
34. The resistance of a conductor as the temperature rises
Answer: A. increases
35. The resistance of semiconductors as the temperature rises
Answer: B. decreases
36. A tungsten bulb burns out the moment it is switched on mainly because
Answer: C. the cold filament has low resistance so a large current flows
37. The resistance of a material always decreases when
Answer: D. the number of free electrons increases
38. Conductance is the reciprocal of
Answer: A. resistance
39. The resistance offered by a wire of length 1 m and cross-sectional area 1 m² is called
Answer: B. resistivity
40. The formula for resistance in terms of resistivity is
Answer: C. R = ρL/A
41. The formula for resistivity is
Answer: B. ρ = RA/L
42. The SI unit of resistivity is
Answer: C. ohm-metre
43. Good electrical conductors have
Answer: A. very low resistivities
44. The resistivity of semiconductors lies
Answer: D. between those of conductors and insulators
45. Which of these metals has the lowest resistivity in the book's table?
Answer: A. Silver
46. The resistivity of copper is about
Answer: C. 1.72×10-8 Ω m
47. A 1 m silver wire (ρ = 1.6×10-8 Ω m) with area 0.4 cm² has resistance
Answer: D. 0.4 mΩ
48. A wire of length 2 m and area 0.4 mm² has resistance 0.085 Ω. Its resistivity is
Answer: B. 1.7×10-8 Ω m
49. The resistivity of a metal ______ with rising temperature.
Answer: D. increases
50. The temperature coefficient of resistivity is positive for
Answer: A. metals
About Physics Class 10 Unit 16 MCQs (Federal Board)
These 63 Physics MCQs cover Class 10 Unit 16: Current Electricity 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 Current Electricity notes for this chapter. Download the Current Electricity MCQs as a PDF using the button at the top of this page.