# 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 given circuit, the value of the resistance in which the maximum heat is produced is:

1. $$2~\Omega$$
2. $$6~\Omega$$
3. $$4~\Omega$$
4. $$12~\Omega$$

Subtopic:  Heating Effects of Current |
63%
From NCERT
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Twelve wires of equal resistance $$R$$ are connected to form a cube. The effective resistance between two diagonal ends $$A$$ and $$E$$ will be:

 1 $$\dfrac{5 R}{6}$$ 2 $$\dfrac{6 R}{5}$$ 3 $$12 R$$ 4 $$3 R$$
Subtopic:  Kirchoff's Voltage Law |
71%
From NCERT
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A potential divider is used to give outputs of $$2~\text{V}$$ and $$3~\text{V}$$ from a $$5~\text{V}$$ source, as shown in the figure.

Which combination of resistances, from the ones given below, $$R_1, R_2, ~\text{and}~R_3$$ give the correct voltages?
 1 $${R}_1=1~\text{k} \Omega, {R}_2=1 ~\text{k} \Omega, {R}_3=2 ~\text{k} \Omega$$ 2 $${R}_1=2 ~\text{k} \Omega, {R}_2=1~\text{k} \Omega, {R}_3=2~\text{k} \Omega$$ 3 $${R}_1=1 ~\text{k} \Omega, {R}_2=2~ \text{k} \Omega, {R}_3=2~ \text{k} \Omega$$ 4 $${R}_1=3~\text{k} \Omega, {R}_2=2~\text{k} \Omega, {R}_3=2~ \text{k} \Omega$$
Subtopic:  Combination of Resistors |
79%
From NCERT
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Two batteries, one of emf $$18~\text{V}$$ and internal resistance $$2~\Omega$$ and the other of emf $$12$$ V and internal resistance $$1~\Omega$$, are connected as shown. Reading of the voltmeter is:
(if voltmeter is ideal)

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

Subtopic:  Grouping of Cells |
77%
From NCERT
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Current through the $$2~\Omega$$ resistance in the electrical network shown is:

 1 zero 2 $$1$$ A 3 $$3$$ A 4 $$5$$ A
Subtopic:  Grouping of Cells |
77%
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The dependence of resistivity $$(\rho)$$ on the temperature $$(T)$$ of a semiconductor is, roughly, represented by:

 1 2 3 4
Subtopic:  Derivation of Ohm's Law |
64%
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What is the reading of the voltmeter of resistance $$1200~\Omega$$ connected in the following circuit diagram?

 1 $$2.5$$ V 2 $$5.0$$ V 3 $$7.5$$ V 4 $$40$$ V
Subtopic:  Combination of Resistors |
67%
From NCERT
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A coil heating a bucket full of water raises the temperature by $$5^{\circ}\text{C}$$ in $$2$$ min. lf the current in the coil is doubled, what will be the change in the temperature of water in $$1$$ min? (Assume no loss of heat to the surroundings)
 1 $$10^{\circ}\text{C}$$ 2 $$5^{\circ}\text{C}$$ 3 $$20^{\circ}\text{C}$$ 4 $$15^{\circ}\text{C}$$
Subtopic:  Heating Effects of Current |
61%
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Power consumed in the given circuit is $$P_1$$. On interchanging the position of $$3~\Omega$$ and $$12~\Omega$$ resistances, the new power consumption is $$P_2$$. The ratio of $$\frac{P_2}{P_1}$$ is:

 1 $$2$$ 2 $$1 \over 2$$ 3 $$3 \over 5$$ 4 $$2 \over 5$$
Subtopic:  Heating Effects of Current |
69%
From NCERT
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