# An AC source rated $$100~\mathrm{V}$$ (rms) supplies a current of $$10~\mathrm{A}$$ (rms) to a circuit. The average power delivered by the source: (a) must be $$1000~\mathrm{W}$$. (b) may be $$1000~\mathrm{W}$$. (c) may be greater than $$1000~\mathrm{W}$$. (d) may be less than $$1000~\mathrm{W}$$. Choose the correct option: 1. (a) only 2. (b), (c) 3. (b), (d) 4. (a), (d)

Subtopic:  Power factor |
61%
From NCERT
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To convert mechanical energy into electrical energy, one can use

(a) DC dynamo
(b) AC dynamo
(c) motor
(d) transformer

Choose the correct option

1. (a) only

2. (b), (c)

3. (a), (b)

4. (a), (d)

Subtopic:  AC Generator |
From NCERT
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The AC voltage across a resistance can be measured using

(a) a potentiometer
(b) a hot-wire voltmeter
(c) a moving-coil galvanometer
(d) a moving-magnet galvanometer

Choose the correct option

1. (a), (b)

2. (b) only

3. (c), (d)

4. (a), (d)

Subtopic:  RMS & Average Values |
65%
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An inductor-coil having some resistance is connected to an AC source. Which of the following quantities have zero average value over a cycle?

(a) current
(b) induced emf in the inductor
(c) Joule heat
(d) magnetic energy stored in the inductor

Choose the correct option

1. (a) only

2. (b), (c)

3. (c), (d)

4. (a), (b)

Subtopic:  RMS & Average Values |
53%
From NCERT
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In an AC series circuit, the instantaneous current is zero when the instantaneous voltage is maximum. Connected to the source may be a:

 (a) pure inductor. (b) pure capacitor. (c) pure resistor. (d) combination of an inductor and a capacitor.

Choose the correct option:

 1 (a), (b), (d) 2 (b), (c), (a) 3 (c), (d), (a) 4 (a), (d), (c), (b)

Subtopic:  Different Types of AC Circuits |
71%
From NCERT
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The reactance of a circuit connected to an AC circuit is zero. It is possible that the circuit contains

(a) an inductor and a capacitor
(b) an inductor but no capacitor
(c) a capacitor but no inductor
(d) neither an inductor nor a capacitor

Choose the correct option

1.  (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Different Types of AC Circuits |
56%
From NCERT
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An inductor, a resistor and a capacitor are joined in series with an AC source. As the frequency of the source is slightly increased from a very low value, the reactance,

 a. of the inductor increases. b. of the resistor increases. c. of the capacitor increases. d. of the circuit increases.

Choose the correct option:
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic:  Different Types of AC Circuits |
62%
From NCERT
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A constant current of 2.8 A exists in a resistor. The RMS current is

1.  2.8 A

2.  about 2 A

3.  1.4 A

4.  undefined for a direct current

Subtopic:  RMS & Average Values |
52%
From NCERT
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An alternating current having peak value $$14$$ A is used to heat a metal wire. To produce the same heating effect, a constant current $$i$$ can be used, where $$i$$ is:
1. $$14$$ A
2. about $$20$$ A
3. $$7$$ A
4. about $$10$$ A

Subtopic:  Power factor |
65%
From NCERT
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An alternating current is given by
$$i=i_1 \cos \omega t+i_2 \sin \omega t$$
The rms current is given by:

1.    $$\frac{i_{1}+i_{2}}{\sqrt{2}}$$

2.  $$\frac{\left|i_{1}-i_{2}\right|}{\sqrt{2}}$$

3.   $$\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{2}}$$

4.  $$\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}$$

Subtopic:  RMS & Average Values |
83%
From NCERT
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