21. A free electron is a valence electron that has broken away from its parent atom. A. True B. False Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
22. The atomic number is the number of neutrons in the nucleus. A. True B. False Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
23. An ohmmeter is an instrument for measuring A. Current B. Voltage C. Resistance D. Wattage Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
24. A red, red, orange, gold resistor has a nominal value of A. 22,000 Ω B. 2,200 Ω C. 22 Ω D. 2.2 Ω Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
25. A twoterminal variable resistor is known as a A. Potentiometer B. Thermistor C. Rheostat D. Wiper Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
26. A wiper is the sliding contact in a A. Switch B. Photoconductive cell C. Thermistor D. Potentiometer Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
27. When the current is 2.5 A, how many coulombs pass a point in 0.2 s? A. 12.5 C B. 1.25 C C. 0.5 C D. 5 C Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
28. An ammeter is connected across the current path. A. True B. False Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
29. A voltmeter is connected across the current path. A. True B. False Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
30. Electrons in the outer orbit are called A. Nuclei B. Valences C. Waves D. Shells Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board