The equivalent resistance between $$A$$ and $$B$$ for the mesh shown in the figure is:        1. $$7.2$$  $$\Omega$$ 2. $$16$$  $$\Omega$$ 3. $$30$$  $$\Omega$$ 4. $$4.8$$  $$\Omega$$

Subtopic:  Combination of Resistors |
87%
From NCERT
NEET - 2020
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Two solid conductors are made up of the same material and have the same length and the same resistance. One of them has a circular cross-section of area ${A}_{1}$ and the other one has a square cross-section of area ${A}_{2}$. The ratio ${A}_{1}/{A}_{2}$ is:

 1 $$1.5$$ 2 $$1$$ 3 $$0.8$$ 4 $$2$$
Subtopic:  Derivation of Ohm's Law |
82%
From NCERT
NEET - 2020
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A $$5\text-$$ampere fuse wire can withstand a maximum power of $$1$$ watt in a circuit. The resistance of the fuse wire is:

 1 $$5~\Omega$$ 2 $$0.04~\Omega$$ 3 $$0.2~\Omega$$ 4 $$0.4~\Omega$$
Subtopic:  Heating Effects of Current |
87%
From NCERT
AIPMT - 2005
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A battery is charged at a potential of $$15$$ V for $$8$$ hours when the current flowing is $$10$$ A. The battery on discharge supplies a current of $$5$$ A for $$15$$ hours. The mean terminal voltage during discharges is $$14$$ V. The "Watt hour" efficiency of the battery is:
1. $$80\%$$
2. $$90\%$$
3. $$87.5\%$$
4. $$82.5\%$$

Subtopic:  EMF & Terminal Voltage |
68%
From NCERT
AIPMT - 2004
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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 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 |
64%
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%
From NCERT
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