# Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is: 1. current density 2. current 3. drift velocity 4. electric field

Subtopic:  Current & Current Density |
59%
From NCERT
NEET - 2015
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A student measures the terminal potential difference $$V$$ of a cell (of emf $$E$$ and internal resistance $$R$$) as a function of the current $$I$$ flowing through it. The slope and intercept of the graph between $$V$$ and $$I$$, respectively, is equal to:
1. $$E$$ and $$-r$$
2. $$-r$$ and $$E$$
3. $$r$$ and $$-E$$
4. $$-E$$ and $$r$$
Subtopic:  EMF & Terminal Voltage |
69%
From NCERT
AIPMT - 2009
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A filament bulb ($$500$$ W, $$100$$ V) is to be used in a $$230$$ V main supply. When a resistance$$R$$ is connected in series, the bulb works perfectly and consumes $$500$$ W. The value of $$R$$ is:

 1 $$230$$ $\mathrm{\Omega }$ 2 $$46$$ $\mathrm{\Omega }$ 3 $$26$$ $\mathrm{\Omega }$ 4 $$13$$ $\mathrm{\Omega }$
Subtopic:  Heating Effects of Current |
66%
From NCERT
NEET - 2016
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A battery consists of a variable number $$n$$ of identical cells (having internal resistance $$r$$ each) which are connected in series. The terminals of the battery are short-circuited and the current $$I$$ is measured. Which of the graphs shows the correct relationship between $$I$$ and $$n?$$

 1 2 3 4
Subtopic:  Grouping of Cells |
66%
From NCERT
NEET - 2018
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A charged particle having drift velocity of $$7.5\times10^{-4}~\text{ms}^{-1}$$ in an electric field of $$3\times10^{-10}~\text{Vm}^{-1}$$, has mobility of:
1. $$2.5\times 10^{6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}$$
2. $$2.5\times 10^{-6}~\text{m}^2\text{V}^{-1}\text{s}^{-1}$$
3. $$2.25\times 10^{-15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}$$
4. $$2.25\times 10^{15}~\text{m}^2\text{V}^{-1}\text{s}^{-1}$$

Subtopic:  Current & Current Density |
82%
From NCERT
NEET - 2020
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For the circuit shown in the figure, the current $$I$$ will be:

 1 $$0.75~\text{A}$$ 2 $$1~\text{A}$$ 3 $$1.5~\text{A}$$ 4 $$0.5~\text{A}$$
Subtopic:  Grouping of Cells |
81%
From NCERT
NEET - 2020
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Two batteries, one of emf $$18$$ volts and internal resistance $$2~\Omega$$ and the other of emf $$12$$ V and internal resistance $$1~\Omega,$$ are connected as shown. The voltmeter $$\mathrm{V}$$ will record a reading of:

1. $$18$$ V
2. $$30$$ V
3. $$14$$ V
4. $$15$$ V

Subtopic:  Grouping of Cells |
72%
From NCERT
AIPMT - 2005
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Given below are two statements:
 Statement I: The law of conservation of energy is valid in electric circuits. Statement II: Kirchhoff's junction law is applicable to electric circuits.

 1 Statement I and Statement II are True and Statement I is the correct explanation of Statement II. 2 Statement I and Statement II are True and Statement I is not the correct explanation of Statement II. 3 Statement I is True, Statement II is False. 4 Statement I is False, Statement II is True.
Subtopic:  Kirchoff's Current Law |
50%
From NCERT
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

 1 increases 2 decreases 3 remains constant 4 may increase or decrease
Subtopic:  Derivation of Ohm's Law |
76%
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When no current is passed through a conductor,

 (a) the free electrons do not move. (b) the average speed of a free electron over a large period of time is zero. (c) the average velocity of a free electron over a large period of time is zero. (d) the average of the velocities of all the free electrons at an instant is zero.

Choose the correct option:

 1 (a) only 2 (b), (c) 3 (c), (d) 4 (a), (d)
Subtopic:  Current & Current Density |
55%
From NCERT
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