# A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves: 1. the potential gradients. 2. a condition of no current flow through the galvanometer. 3. a condition of cells, galvanometer, and resistances. 4. the cells.

Subtopic:  Meter Bridge & Potentiometer |
68%
From NCERT
NEET - 2017
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The figure shows a circuit that contains three identical resistors with resistance $$R = 9.0~\Omega$$ each, two identical inductors with inductance $$L = 2.0~\text{mH}$$ each, and an ideal battery with emf $$\varepsilon = 18~\text{V}$$. The current $$'i'$$ through the battery just after the switch is closed will be:

1. $$0.2~\text{A}$$
2. $$2~\text{A}$$
3. $$4~\text{A}$$
4. $$2~\text{mA}$$

Subtopic:  RC Circuit (OLD NCERT) |
From NCERT
NEET - 2017
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The potential difference $$V_\mathrm{A}-V_\mathrm{B}$$ between the points $$\mathrm{A}$$ and $$\mathrm{B}$$ in the given figure is:

 1 $$-3~\text{V}$$ 2 $$+3~\text{V}$$ 3 $$+6~\text{V}$$ 4 $$+9~\text{V}$$

Subtopic:  Kirchoff's Voltage Law |
78%
From NCERT
NEET - 2016
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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 potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite directions. The balance points are obtained at 50 cm and 10 cm from the positive end of the wire in the two cases. The ratio of the emf of the two cells is:
1. 5 : 4
2. 3 : 4
3. 3 : 2
4. 5 : 1
Subtopic:  Meter Bridge & Potentiometer |
68%
From NCERT
NEET - 2016
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The charge flowing through a resistance $$R$$ varies with time $$t$$ as $$Q=at-bt^2,$$ where $$a$$ and $$b$$ are positive constants. The total heat produced in $$R$$ is:
 1 $$\dfrac{a^3R}{3b}$$ 2 $$\dfrac{a^3R}{2b}$$ 3 $$\dfrac{a^3R}{b}$$ 4 $$\dfrac{a^3R}{6b}$$
Subtopic:  Heating Effects of Current |
56%
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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The resistance of a wire is $$R~\Omega$$. If it is melted and stretched $$n$$ times its original length, its new resistance will be:
1. $$\frac{R}{n}$$
2. $$n^{2}R$$
3. $$\frac{R}{n^{2}}$$
4. $$nR$$
Subtopic:  Combination of Resistors |
78%
From NCERT
NEET - 2017
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A set of '$$n$$' equal resistors, of value '$$R$$' each, are connected in series to a battery of emf '$$E$$' and internal resistance '$$R$$'. The current drawn is $$I.$$ Now, if '$$n$$' resistors are connected in parallel to the same battery, then the current drawn becomes $$10I.$$ The value of '$$n$$' is:

 1 $$10$$ 2 $$11$$ 3 $$20$$ 4 $$9$$
Subtopic:  EMF & Terminal Voltage |
74%
From NCERT
NEET - 2018
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The potential difference $\left({\mathrm{V}}_{\mathrm{A}}-{\mathrm{V}}_{\mathrm{B}}\right)$ between points A and B in the given figure is if the current is flowing from A to B:

(1) - 3 V

(2) +3 V

(3) +6 V

(4) +9 V

Subtopic:  Kirchoff's Voltage Law |
From NCERT
NEET - 2016
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