Consider the following two statements :

1. Kirchhoff's junction law follows from the conservation of charge.

2. Kirchhoff's loop law follows from the conservation of energy.

     Which of the following is correct?

(a) Both (A) and (B) are wrong

(b) (A) is correct and (B) is wrong

3. (A)  is wrong and (B) is correct

4. Both (A) and (B) are correct

Subtopic:  Kirchoff's Voltage Law |
 82%
From NCERT
NEET - 2010
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A wire of resistance \(12~\Omega \text{m}^{-1}\) is bent to form a complete circle of radius \(10~\text{cm}\). The resistance between its two diametrically opposite points, \(A\) and \(B\) as shown in the figure, is:

                         
1. \(0.6\pi~\Omega\)
2. \(3~\Omega\)
3. \(6\pi~\Omega\)
4. \(6~\Omega\)

Subtopic:  Combination of Resistors |
 58%
From NCERT
NEET - 2009
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A student measures the terminal potential difference \((V)\) of a cell (of emf \(\varepsilon \) and internal resistance \(r\)) as a function of the current \((I)\) flowing through it. The slope and intercept of the graph between \(V\) and \(I,\) then respectively, equal:
1. \(\varepsilon \) and \(-r\)
2. \(-r\) and \(\varepsilon \)
3.  \(r\) and \(-\varepsilon \)
4. \(-\varepsilon \) and \(r\)

Subtopic:  EMF & Terminal Voltage |
 66%
From NCERT
NEET - 2009
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A current of 3A flows through the 2Ω resistor shown in the circuit. The power dissipated in the 5Ω resistor is

 

1. 4 W                                             
2. 2 W
3. 1 W                                             
4. 5 W

Subtopic:  Heating Effects of Current |
 79%
From NCERT
NEET - 2008
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A wire of a certain material is streched slowly by ten per cent. Its new resistance and specific resistance become respectively 

1. 1.2 times, 1.1 times

2. 1.21 times,same 

3. both remain the same

4. 1.1 times, 1.1 times

Subtopic:  Derivation of Ohm's Law |
 83%
From NCERT
NEET - 2008
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C

1. 6.3 min

2. 8.4 min

3. 12.6 min

4. 4.2 min

Subtopic:  Heating Effects of Current |
 53%
NEET - 2008
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A cell can be balanced against 110cm and 100 cm of potentiometer wire, respectively with and without being short-circuited through a resistance of 10 Ω. Its internal resistance is 

1. 1.0 Ω

2. 0.5 Ω

3. 2.0 Ω

4. zero 

Subtopic:  Grouping of Cells | Meter Bridge & Potentiometer |
 79%
From NCERT
NEET - 2008
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In the circuit shown, the current through the \(4~\Omega\) resistor is \(1~\text{A}\) when the points \(P\) and \(M\) are connected to a DC voltage source. The potential difference  between the points \(M\) and \(N\) is: 


1. \(1.5~\text{V}\)
2. \(1.0~\text{V}\)
3. \(0.5~\text{V}\)
4. \(3.2~\text{V}\)

Subtopic:  Kirchoff's Voltage Law |
 62%
From NCERT
NEET - 2008
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In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length. The null points for the two primary cells of emfs E1 and E2 connected in the manner shown are obtained at a distance of 120 cm and 300 cm from the end A. Find (i) E1E2and  position of null point for the cell E1.

How is the sensitivity of a potentiometer increased ?

  

Using Kirchoffs rules determine the value of unknown resistance R in the circuit so that no current flows through 4 Ω resistance. Also find the potential difference between A and D.

   

Subtopic:  Meter Bridge & Potentiometer |
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A capacitor of capacitance 5 μF is connected as shown in the figure. The internal resistance of the cell is 0.5 Ω. The amount of charge on the capacitor plate is?

1. 0 μC

2. 5 μC

3. 10 μC

4. 25 μC

Subtopic:  RC Circuit (OLD NCERT) |
 55%
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