Q1 · hard · AI-verified
A teacher wants students to understand that some materials are semiconductors. Which of the following is the BEST example of a semiconductor used in making electronic devices?
- Rubber
- Silicon
- Graphite
- Copper
Q2 · hard · AI-verified
Two resistors of 3 Ω and 6 Ω are connected in series and the combination is connected to a 9 V battery. What is the current flowing through the 6 Ω resistor?
- 2 A
- 1 A
- 0.5 A
- 1.5 A
Q3 · hard · AI-verified
A wire of resistance 12 Ω is stretched uniformly to double its original length. What is the new resistance of the wire?
- 6 Ω
- 24 Ω
- 48 Ω
- 3 Ω
Q4 · hard · AI-verified
A torch bulb is rated 2.5 V and 500 mA. What is the resistance of the bulb when it is glowing?
- 2.5 Ω
- 5 Ω
- 0.2 Ω
- 1250 Ω
Q5 · hard · AI-verified
A student connects four identical cells, each of EMF 1.5 V, in series. If the total voltage is used to drive a circuit of resistance 6 Ω, what is the heat produced in the resistor in 10 seconds?
- 90 J
- 150 J
- 36 J
- 60 J