The variation of EMF with time for four types of generators is shown in the figures. Which amongst them can be called AC voltage?

   
(a) (b)
   
(c) (d)

1. (a) and (d)
2. (a), (b), (c), and (d)
3. (a) and (b)
4.  only (a)

Subtopic:  AC Generator |
 70%
From NCERT
NEET - 2019
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A circuit when connected to an AC source of \(12~\text{V}\) gives a current of \(0.2~\text{A}\). The same circuit when connected to a DC source of \(12~\text{V}\), gives a current of \(0.4~\text{A}\). The circuit is:
1. series \({LR}\)
2. series \({RC}\)
3. series \({LC}\)
4. series \({LCR}\)

Subtopic:  Different Types of AC Circuits |
 56%
From NCERT
NEET - 2019
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For the circuit shown in the figure, the time constant is

1. 1011s
2. 910s
3. 57s
4. 34s

Subtopic:  Different Types of AC Circuits |
 68%
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If i=2t, then the R.M.S. value of current between 0 to 2 second is

1. 23
2. 43
3. 53
4. zero 

Subtopic:  RMS & Average Values |
 67%
From NCERT
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L, C, and R denote inductance, capacitance, and resistance respectively. pick out the combination which does not have the dimension of frequency.

1. 1RC
2. RL
3. 1Lc
4. CL

Subtopic:  Different Types of AC Circuits |
 65%
From NCERT
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The phase difference (ϕ) between emf and current in LCR series a.c. circuit is

1. ϕ= 0
2. 0ϕ<π2
3.π2<ϕ<π
4. ϕ=π

Subtopic:  Different Types of AC Circuits |
 80%
From NCERT
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The primary and secondary coils of an ideal transformer have 100 and 5000 turns respectively. The magnetic flux linking the primary coil is given by ϕ= 20t + 10. The output voltage across the secondary coil is

1. 20 V

2. 500 V

3. 1000 V

4. 10000 V

Subtopic:  Transformer |
 82%
From NCERT
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In the LCR-circuit shown below, if the reading of the voltmeters V1 and V2 are same, then

     

1. ω2=1LC

2. Reading of the voltmeter V is 50 V

3. Reading of the ammeter A is 5 A

4. All of these

Subtopic:  LC Oscillations (OLD NCERT) |
 87%
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If R and L are resistance and inductance of a choke coil and f is the frequency of current through it, then the average power of the choke coil is proportional to:
1.  \(R ~\)
2.  \(\frac{1}{f^2}\)
3.  \(\frac{1}{L^2}\)
4.  All of these

Subtopic:  Power factor |
 64%
From NCERT
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Which of the following is/are copper loss/losses in a transformer?

1. Hysteresis loss

2. Eddy current loss

3. Heat loss in the primary and second coils

4. Both (1) & (2)

Subtopic:  Transformer |
From NCERT
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