Q. No.Two heaters \(\mathrm{A}\) and \(\mathrm{B}\) have power rating of \(1~\text{kW}\) and \(2~\text{kW}\), respectively. Those two are first connected in series and then in parallel to a fixed power source. The ratio of power outputs for these two cases is:
| 1. | \(2:9\) | 2. | \(1:2\) |
| 3. | \(2:3\) | 4. | \(1:1\) |
Subtopic: Â Heating Effects of Current |
 59%
Level 3: 35%-60%
NEET - 2024
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A resistor has a resistance of \(5.0 ~\Omega.\) There is a direct current of \(10~\text{A}\) in the resistor. What is the power dissipated by the resistor?
1. \(50~\text{W}\)
2. \(2500~\text{W}\)
3. \(20~\text{W}\)
4. \(500~\text{W}\)
1. \(50~\text{W}\)
2. \(2500~\text{W}\)
3. \(20~\text{W}\)
4. \(500~\text{W}\)
Subtopic: Â Heating Effects of Current |
 90%
Level 1: 80%+
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Two resistors \(R\) and \(2R\) are connected in series in an electric circuit. The thermal energy developed in \(R\) and \(2R\) are in the ratio of:
1. \(1:2\)
2. \(2:1\)
3. \(1:4\)
4. \(4:1\)
Subtopic: Â Heating Effects of Current |
 79%
Level 2: 60%+
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The circuit shown in the figure has ideal batteries wired up along with the resistances.
The power dissipated in the resistances in the circuit is:
1. \(12~\text{J/s}\)
2. \(9~\text{J/s}\)
3. \(8~\text{J/s}\)
4. \(5.5~\text{J/s}\)
The power dissipated in the resistances in the circuit is:
1. \(12~\text{J/s}\)
2. \(9~\text{J/s}\)
3. \(8~\text{J/s}\)
4. \(5.5~\text{J/s}\)
Subtopic: Â Heating Effects of Current |
 57%
Level 3: 35%-60%
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\(150\) cc of water taken in an electric kettle boils in \(20\) minutes. If the same amount of water is to be boiled in \(10\) minutes, the length of the heating element will have to be:
| 1. | one fourth | 2. | one third |
| 3. | two times | 4. | one half |
Subtopic: Â Heating Effects of Current |
 50%
Level 3: 35%-60%
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A resistor of resistance \(R\) is connected to an ideal battery. If the value of \(R\) is decreased, the power dissipated in the resistor will:
| 1. | increase | 2. | decrease |
| 3. | remains unchanged | 4. | can't be determined |
Subtopic: Â Heating Effects of Current |
 68%
Level 2: 60%+
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Two identical resistances are once connected in parallel and then in series to a source of \(\text{V}~\text{volts}. \) The ratio of power consumed in parallel to that in series will be:
1. \(1:4\)
2. \(1:2\)
3. \(1:1\)
4. \(4:1\)
1. \(1:4\)
2. \(1:2\)
3. \(1:1\)
4. \(4:1\)
Subtopic: Â Heating Effects of Current |
 65%
Level 2: 60%+
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Six similar bulbs are connected as shown in the figure with a DC source of emf \(E\) and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section \(\mathrm{A}\) and one from section \(\mathrm{B}\) are glowing, will be:
| 1. | \(2:1\) | 2. | \(4:9\) |
| 3. | \(9:4\) | 4. | \(1:2\) |
Subtopic: Â Heating Effects of Current |
 66%
Level 2: 60%+
NEET - 2019
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Two resistors of resistance, \(100~\Omega\) and \(200~\Omega\) are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in \(100~\Omega\) resistor to that in \(200~\Omega\) resistor in a given time is:
| 1. | \(4:1\) | 2. | \(1:2\) |
| 3. | \(2:1\) | 4. | \(1:4\) |
Subtopic: Â Heating Effects of Current |
 71%
Level 2: 60%+
NEET - 2022
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Two resistors having equal resistances are joined in series and a current is passed through the combination. Neglect any variation in resistance as the temperature changes. In a given time interval,
| (a) | equal amounts of thermal energy must be produced in the resistors. |
| (b) | unequal amounts of thermal energy may be produced. |
| (c) | the temperature must rise equally in the resistors. |
| (d) | the temperature may rise equally in the resistors. |
Choose the correct option:
| 1. | (a), (b) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Â Heating Effects of Current |
 77%
Level 2: 60%+
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