A capacitor acts as an infinite resistance for
1. DC
2. AC
3. DC as well as AC
4. neither AC nor DC
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn AC source producing emf
ε = ε0 [cos(100 π s–1)t + cos(500 π s–1)t]
is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be
i = i1 cos [(100 π s–1)t +ϕ1] i2 cos[(500 π s–1)t + φ2]
1. i1 > i2
2. i1 = i2
3. i1 < i2
4. the information is insufficient to find the relation between i1 and i2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe peak voltage in a 220 V AC source is
1. 220 V
2. about 160 V
3. about 310 V
4. 440 V
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn AC source is rated \(220~\mathrm{V}\), \(50~\mathrm{Hz}\). The average voltage is calculated in a time interval of \(0.01~\mathrm{s}\). It,
1. | must be zero |
2. | may be zero |
3. | is never zero |
4. | \(220\sqrt{2}\) V | is
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
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
\(i=i_1 \cos \omega t+i_2 \sin \omega t\)
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. \(\sqrt{\frac{i_{1}^{2}+i_{2}^{2}}{\sqrt{2}}}\)
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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 & Biology