The colour code of resistance is given below: The values of resistance and tolerance, respectively are: 1.  47 k$\mathrm{\Omega }$, 10% 2.  4.7 k$\mathrm{\Omega }$, 5% 3.  470 $\mathrm{\Omega }$, 5% 4.  470 k$\mathrm{\Omega }$, 5%

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
69%
From NCERT
NEET - 2020
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A capacitor of 4 $\mathrm{\mu F}$ is connected as shown in the circuit. The internal resistance of the battery is 0.5 $\mathrm{\Omega }$. The amount of charge on the capacitor plates will be:

1. 0 $\mathrm{\mu C}$

2. 4 $\mathrm{\mu C}$

3. 16 $\mathrm{\mu C}$

4. 8 $\mathrm{\mu C}$

Subtopic:  RC Circuit (OLD NCERT) |
From NCERT
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When the key K is pressed at time t = 0, which of the following statement about the current I in the resistor AB of the given circuit is true?

 1 I = 2 mA at all t 2 I oscillates between 1 mA and 2 mA 3 I = 1 mA at all t 4 At t = 0 , I = 2 mA and with time, it goes to 1 mA

Subtopic:  RC Circuit (OLD NCERT) |
60%
From NCERT
PMT - 1995
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In the figure below, what is the potential difference between the point A and B and between B and C, respectively, in steady state?

1. ${V}_{AB}={V}_{BC}=100\text{\hspace{0.17em}}V$

2. ${V}_{AB}=75\text{\hspace{0.17em}}V,\text{\hspace{0.17em}}{V}_{BC}=25\text{\hspace{0.17em}}V$

3. ${V}_{AB}=25\text{\hspace{0.17em}}V,\text{\hspace{0.17em}}{V}_{BC}=75\text{\hspace{0.17em}}V$

4. ${V}_{AB}={V}_{BC}=50\text{\hspace{0.17em}}V$

Subtopic:  RC Circuit (OLD NCERT) |
From NCERT
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A carbon resistor (47 ± 4.7) kΩ is to be marked with rings of different colours for its identification. The colour code sequence will be:

1. Violet - Yellow - Orange - Silver

2. Yellow - Violet - Orange - Silver

3. Yellow - Green - Violet - Gold

4. Green - Orange - Violet - Gold

Subtopic:  Colour Coding of Resistors (OLD NCERT) |
83%
From NCERT
NEET - 2018
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Consider a capacitor-charging circuit. Let Q1 be the charge given to the capacitor in a time interval of 10 ms and Q2 be the charge given in the next time interval of 10 ms. Let 10 µC charge be deposited in a time interval J, and the next 10 µC charge is deposited in the next time interval t2

1.   Q1 > Q2 , t1 > t2

2.   Q1 > Q2 , t1 < t2

3.   Q1 < Q2 , t1 > t2

4.   Q1 < Q2 ,  t< t2

Subtopic:  RC Circuit (OLD NCERT) |
59%
From NCERT
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A capacitor C1 of capacitance 1 µF and a capacitor C2 of capacitance 2 µF are separately charged by a common battery for a long time. The two capacitors are then separately discharged through equal resistors. Both the discharge circuits are connected at t = 0.

(a) The current in each of the two discharging circuits is zero at t = 0.
(b) The currents in the two discharging circuits at t = 0 are equal but not zero.
(c) The currents in the two discharging circuits at t = 0 are unequal.
(d) C1 loses 50% of its initial charge sooner than C2 loses 50% of its initial charge

Choose the correct option

1. (a) only

2. (b), (d)

3. (c), (d)

4. (a), (d)

Subtopic:  RC Circuit (OLD NCERT) |
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

A battery of emf E is used to charge an uncharged capacitor C, through a resistance R. The time constant of the circuit is $${\tau = RC}$$.
 Assertion (A): When the voltage across the capacitor reaches 50% of its maximum value, the rate of heat dissipation in the resistor falls to $$\frac14$$ of its initial value. Reason (R): The voltage across the capacitor is proportional to the charge on its plates, while the rate of flow of charge is the current (i). This current (i) falls exponentially with a time constant T, and it falls to 50% of its initial value when the capacitor is 50% charged. The rate of heat dissipation, being proportional to i2, falls to $$\frac14$$ of its initial value.

In the light of the above statements choose the correct answer from the options given below:

 1 Both (A) and (R) are true and (R) is the correct explanation of (A). 2 Both (A) and (R) are true but (R) is not the correct explanation of (A). 3 (A) is true but (R) is false. 4 (A) is false but (R) is true.
Subtopic:  RC Circuit (OLD NCERT) |
70%
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A 4 μF capacitor and a resistance of 2.5 MΩ are in series with a 12 V battery. The time after which the potential difference across the capacitor is 3 times the potential difference across the resistor is: [Given ln(2)= 0.693]

1. 13.86 s

2. 6.93 s

3. 7 s

4. 14 s

Subtopic:  RC Circuit (OLD NCERT) |
From NCERT
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In the given figure each plate of capacitance C has partial value of charge equal to:

1. CE

2. $\frac{CE{R}_{1}}{{R}_{2}-r}$

3. $\frac{CE{R}_{2}}{{R}_{2}+r}$

4. $\frac{CE{R}_{1}}{{R}_{1}-r}$

Subtopic:  RC Circuit (OLD NCERT) |
63%
From NCERT
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