When three identical bulbs are connected in series, the consumed power is 10 W. If they are now connected in parallel then the consumed power will be:
1.  30 W
2.  90 W
3.  \(\frac{10}{3}\) W
4.  270 W

Subtopic:  Heating Effects of Current |
 67%
From NCERT
AIPMT - 1998
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In a hot wire ammeter due to the flowing of the current, the temperature of the wire is increased by 5° C. If the value of the current is doubled, then the increase in temperature will be:
1.  15° C
2.  20° C
3.  25° C
4.  30° C

Subtopic:  Heating Effects of Current |
 67%
From NCERT
AIPMT - 1998
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The current in 8 Ω resistance is (in the figure below):

   

1.  0.69 A
2.  0.92 A
3.  1.30 A
4.  1.6 A

Subtopic:  Kirchoff's Voltage Law |
 57%
From NCERT
AIPMT - 1999
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If the power dissipated in 5 Ω is 20 W then the power dissipated in 4 Ω is:
   

1.  4 W

2. 6 W

3. 10 W 

4. 20 W

Subtopic:  Heating Effects of Current |
 73%
From NCERT
AIPMT - 1999
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The value of R for which power in it is maximum is:

       

1. 3 Ω
2. 6 Ω
3. 12 Ω
4. 9 Ω

Subtopic:  Heating Effects of Current |
 75%
From NCERT
AIPMT - 1999
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The terminal potential difference of a cell is greater than its emf when:

1. A battery of less emf is connected in its series.
2. A battery of higher emf is connected in its series.
3. A battery of higher emf is connected in its parallel.
4. A battery of less emf is connected in its parallel.


 

Subtopic:  EMF & Terminal Voltage |
From NCERT
AIPMT - 1999
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The net resistance of the circuit between \(A\) and \(B\) is:

   

1. \(\frac{8}{3}~\Omega\) 2. \(\frac{14}{3}~\Omega\)
3. \(\frac{16}{3}~\Omega\) 4. \(\frac{22}{3}~\Omega\)
Subtopic:  Wheatstone Bridge |
 90%
From NCERT
AIPMT - 2000
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A car battery of emf \(12~\text{V}\) and internal resistance \(5\times 10^{-2}~\Omega\) receives a current of \(60~\text{A}\) from an external source. The terminal voltage of the battery is:

1. \(12~\text{V}\) 2. \(9~\text{V}\)
3. \(15~\text{V}\) 4. \(20~\text{V}\)
Subtopic:  EMF & Terminal Voltage |
From NCERT
AIPMT - 2000
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If there are two bulbs of (\(40~\text{W},200~\text{V}\)), and (\(100~\text{W},200~\text{V}\)), then the correct relation for their resistance is:

1. \(\mathrm{R}_{40}<\mathrm{R}_{100}\)
2. \(\mathrm{R}_{40}>\mathrm{R}_{100}\)
3. \(\mathrm{R}_{40}=\mathrm{R}_{100}\)
4. no relation can be predicted

Subtopic:  Heating Effects of Current |
 88%
From NCERT
AIPMT - 2000
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According to the Faraday Law of electrolysis, the mass deposited at electrode will be proportional to:

1. m ∝ I2

2. m ∝ Q

3. m ∝ Q2

4. 'm' does not depend on Q

Subtopic:  Current & Current Density |
 72%
From NCERT
AIPMT - 2000
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