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 |
 65%
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

 

(a) 4 W                                              (b) 2 W

(c) 1 W                                              (d) 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 |
 82%
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

(a) 6.3 min

(b) 8.4 min

(c) 12.6 min

(d) 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 Ω resistor is 1 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 V 

2. 1.0 V

3. 0.5 V 

4. 3.2 V

Subtopic:  Kirchoff's Voltage Law |
 61%
From NCERT
NEET - 2008
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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%
From NCERT
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In the circuit here, the steady state voltage across capacitor C is a fraction of the battery e.m.f. The fraction is decided by 

(1) R1 only

(2) R1 and R2 only

(3) R1 and R3 only

(4) R1, R2 and R3

Subtopic:  RC Circuit (OLD NCERT) |
 68%
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. CER1R2r

3. CER2R2+r

4. CER1R1r

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