A current of 2A flows through a 2Ω resistor

when connected across a battery. The same

battery supplies a current of 0.5 A when

connected across a 9Ω resistor. The internal

resistance of the battery is 

(1) 1/3Ω                   

(2) 1/4Ω

(3) 1Ω                       

(4) 0.5Ω

Subtopic:  EMF & Terminal Voltage |
 75%
From NCERT
NEET - 2011
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In the circuit in the figure, if the potential at point A is taken to be zero, the potential at point B is :

1. -1V                                          2. +2V

3. -2V                                          4. +1V

Subtopic:  Kirchoff's Voltage Law |
 57%
From NCERT
NEET - 2011
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Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

(1) metallic bonding

(2) van der Waals'bonding

(3) ionic bonding 

(4) covalent bonding

Subtopic:  Current & Current Density |
 62%
From NCERT
NEET - 2010
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A potentiometer circuit is set up as shown.The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1and 3, is plugged in, are found to be at lengths l1cm and l2cm respectively.The magnitudes, of the resistors R and X, in ohm, are then, equal, respectively, to

(a)kl2-l1 and kl2

(b)kl1 and kl2-l1

(c)kl2-l1and kl1

(d)kl1 and kl2

Subtopic:  Meter Bridge & Potentiometer |
 67%
From NCERT
NEET - 2010
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 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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