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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA series AC circuit has a resistance of 4 Ω and a reactance of 3. Ω. The impedance of the circuit is
1. 5 Ω
2. 7 Ω
3. 12/7 Ω
4. 7/12 Ω
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTransformers are used
1. in DC circuits only
2. in AC circuits only
3. in both DC and AC circuits
4. neither in DC nor in AC circuits
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn alternating current is given by
i – i1 cos ωt + i2 sin ωt
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. \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn 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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn 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)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology