# The reciprocal of resistance is: 1. reactance 2. mobility 3. conductivity 4. conductance

Subtopic:  Derivation of Ohm's Law |
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The equivalent resistance of the infinite network given below is:

1. $$2~\Omega$$
2. $$(1+\sqrt2)~\Omega$$
3. $$(1+\sqrt3)~\Omega$$
4. $$(1+\sqrt5)~\Omega$$
Subtopic:  Combination of Resistors |
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A cell of emf  $$4~\text{V}$$ and internal resistance $$0.5~\Omega$$ is connected to a $$7.5~\Omega$$ external resistance. The terminal potential difference of the cell is:
 1 $$3.75~\text{V}$$ 2 $$4.25~\text{V}$$ 3 $$4~\text{V}$$ 4 $$0.375~\text{V}$$
Subtopic:  EMF & Terminal Voltage |
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NEET - 2022
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A network of resistors is connected across a $$10~\text{V}$$ battery with an internal resistance of $$1~\Omega$$ as shown in the circuit diagram. The equivalent resistance of the circuit is:

 1 $$\dfrac{17}{3}~\Omega$$ 2 $$\dfrac{14}{3}~\Omega$$ 3 $$\dfrac{12}{7}~\Omega$$ 4 $$\dfrac{14}{7}~\Omega$$
Subtopic:  Combination of Resistors |
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NEET - 2022
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The plot of current $$I~\text{(A)}$$ flowing through a metallic conductor versus the applied voltage $$V~\text{(volt)}$$ across the ends of a conductor is:

 1 2 3 4
Subtopic:  Derivation of Ohm's Law |
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A Wheatstone bridge is used to determine the value of unknown resistance $$\mathrm{X}$$ by adjusting the variable resistance $$\mathrm{Y}$$ as shown in the figure. For the most precise measurement of $$\mathrm{X}$$, the resistances $$\mathrm{P}$$ and $$\mathrm{Q}$$:

 1 do not play any significant role. 2 should be approximately equal to $$2\mathrm{X}$$. 3 should be approximately equal and are small. 4 should be very large and unequal.
Subtopic:  Wheatstone Bridge |
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A copper wire of length $$10$$ m and radius $$\left({10^{-2}/\sqrt{\pi}}\right)$$ m has an electrical resistance of $$10~\Omega.$$ The current density in the wire for an electric field strength of $$10$$ (V/m) is:
1. $$10^{5}$$ A/m2
2. $$10^{4}$$ A/m2
3. $$10^{6}$$ A/m2
4. $$10^{-5}$$ A/m2
Subtopic:  Current & Current Density |
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Two resistors of resistance, $$100$$ $$\Omega$$ and $$200$$ $$\Omega$$ are connected in parallel in an electrical circuit. The ratio of the thermal energy developed in $$100$$ $$\Omega$$ resistor to that in $$200$$ $$\Omega$$ resistor in a given time is:
1. $$4:1$$
2. $$1:2$$
3. $$2:1$$
4. $$1:4$$
Subtopic:  Heating Effects of Current |
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In the Wheatstone Bridge arrangement shown, the resistance $$P$$ is $$2~ \Omega.$$ The bridge is initially balanced. If P and Q are interchanged: an amount equal to $$S$$ has to be added to $$R$$ to restore the balance. The resistance $$Q$$ equals (nearly):

1. $$2 ~\Omega$$
2. $$3.2 ~\Omega$$
3. $$4 ~\Omega$$
4. $$6.4 ~\Omega$$
Subtopic:  Wheatstone Bridge |
From NCERT
The resistance of platinum wire at $$0^{\circ} \text{C}$$ is $$2~ \Omega$$ and $$6.8~ \Omega$$ at $$80^{\circ}\text{C}$$. The temperature coefficient of resistance of the wire is:
 1 $$(3\times 10^{-1})^\circ \text{C}^{-1}$$ 2 $$(3 \times 10^{-4})^\circ \text{C}^{-1}$$ 3 $$(3 \times 10^{-3})^\circ \text{C}^{-1}$$ 4 $$(3 \times 10^{-2})^\circ \text{C}^{-1}$$