EASY
12th ICSE
IMPORTANT
Earn 100

How does an inductor behave in a DC circuit?

Important Questions on Alternating Current

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 31
An inductor is put, turn by turn, across  220 V-50 Hz  and  220 V-100 Hz AC supply. Will the current through it in the two cases be the same?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 32
The resistance of a coil for direct current is 5 Ω. What will be the effect on its resistance when connected in alternating-current circuit?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 33
A bulb and a capacitor are connected in series to a source of alternating current. What will happen on increasing the frequency of the current?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 34
A choke coil and a bulb are connected in series to a DC source. If an iron core is inserted in the choke coil, is there any change in the brightness of the bulb?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 35
An AC circuit has a power factor of 0.5. What will be the phase difference between voltage and current in this circuit? Can you also tell whether the current leads the voltage or the voltage leads the current?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 36
At resonance, what is the relation between impedance of a series L-C-R circuit and its resistance R?
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 37

Variation of alternating current I with time t is shown in the graph below. Find the root mean square value of the current.  

Question Image 

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 38

 An AC source of emf e = 200 sin ωt  is connected to a resistor of 50 Ω, Calculate: Average current (Iav).