Q. No.1. \(50~\text{W}\)
2. \(2500~\text{W}\)
3. \(20~\text{W}\)
4. \(500~\text{W}\)
A cell of internal resistance \(r\) drives current through an external resistance \(R.\) The power delivered by the cell to the external resistance will be maximum when:
1. \(R=1000 r\)
2. \(R=0.001r\)
3. \(R=2r\)
4. \(R=r\)
Which of the following acts as a circuit protection device?
| 1. | Fuse | 2. | Conductor |
| 3. | Inductor | 4. | Switch |
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1. \(150~\text{J}\)
2. \(250~\text{J}\)
3. \(350~\text{J}\)
4. \(450~\text{J}\)
1. \(10\) min
2. \(30\) min
3. \(15\) min
4. \(25\) min
The power dissipated in the circuit shown in the figure is \(30~\text{Watts}\). The value of \(R\) is:
1. \(15~\Omega\)
2. \(10~\Omega\)
3. \(30~\Omega\)
4. \(20~\Omega\)
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1. \(44\)
2. \(20\)
3. \(22\)
4. \(33\)
| 1. | they have equal currents through them. |
| 2. | the resistances of both the bulbs are the same. |
| 3. | the resistance of the bulb of \(40~\text{watts}\) is more. |
| 4. | the resistance of the bulb of \(100~\text{watts}\) is more. |
1. \(1.80\) kJ
2. \(2.20\) kJ
3. \(2.75\) kJ
4. \(3.2\) kJ
In India, electricity is supplied for domestic use at \(220~\text{V}.\) It is supplied at \(110~\text{V}\) in the USA. If the resistance of a \(60~\text{W}\) bulb for use in India is \(R\), the resistance of a \(60~\text{W}\) bulb for use in the USA will be:
| 1. | \(2R\) | 2. | \(\dfrac{R}{4}\) |
| 3. | \(\dfrac{R}{2}\) | 4. | \(R\) |
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