# The current in a wire varies with time according to the equation $$I=(4+2t),$$ where $$I$$ is in ampere and $$t$$ is in seconds. The quantity of charge which has passed through a cross-section of the wire during the time $$t=2$$ s to $$t=6$$ s will be: 1. $$60$$ C  2. $$24$$ C 3. $$48$$ C  4. $$30$$ C

Subtopic:  Current & Current Density |
83%
From NCERT
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What is total resistance across terminals $$A$$ and $$B$$ in the following network?

1. $$R$$
2. $$2R$$
3. $$\frac{3R}{5}$$
4. $$\frac{2R}{3}$$

Subtopic:  Combination of Resistors |
70%
From NCERT
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A voltmeter of resistance $$660~\Omega$$$\mathrm{}$ reads the voltage of a very old cell to be $$1.32$$ V while a potentiometer reads its voltage to be $$1.44$$ V. The internal resistance of the cell is:
1. $$30~\Omega$$$\mathrm{}$
2. $$60~\Omega$$
3. $$6~\Omega$$
4. $$0.6~\Omega$$$\mathrm{}$

Subtopic:  EMF & Terminal Voltage |
77%
From NCERT
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Six similar bulbs are connected as shown in the figure with a DC source of emf $$E$$ and zero internal resistance. The ratio of power consumption by the bulbs when (i) all are glowing and (ii) in the situation when two from section $$\mathrm{A}$$ and one from section $$\mathrm{B}$$ are glowing, will be:

 1 $$2:1$$ 2 $$4:9$$ 3 $$9:4$$ 4 $$1:2$$
Subtopic:  Heating Effects of Current |
64%
From NCERT
NEET - 2019
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The power dissipated across the $$8~\Omega$$ resistor in the circuit shown here is $$2~\text{W}$$. The power dissipated in watts across the $$3~\Omega$$ resistor is:

 1 $$2.0$$ 2 $$1.0$$ 3 $$0.5$$ 4 $$3.0$$
Subtopic:  Heating Effects of Current |
69%
From NCERT
AIPMT - 2006
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In the circuit shown below, if a conducting wire is connected between points $$A$$ and $$B$$, the current in this wire will: (All resistances are given in ohms)

 1 flow from $$A$$ to $$B$$ 2 flow in the direction which will be decided by the value of $$V$$ 3 be zero 4 flow from $$B$$ to $$A$$
Subtopic:  Kirchoff's Voltage Law |
53%
From NCERT
AIPMT - 2006
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Three resistances $$\mathrm P$$, $$\mathrm Q$$, and $$\mathrm R$$, each of $$2~\Omega$$ and an unknown resistance $$\mathrm{S}$$ form the four arms of a Wheatstone bridge circuit. When the resistance of $$6~\Omega$$ is connected in parallel to $$\mathrm{S}$$, the bridge gets balanced. What is the value of $$\mathrm{S}$$?
1. $$2~\Omega$$
2. $$3~\Omega$$
3. $$6~\Omega$$
4. $$1~\Omega$$

Subtopic:  Wheatstone Bridge |
81%
From NCERT
AIPMT - 2007
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The total power dissipated in watts in the circuit shown below is:

 1 $$16$$ W 2 $$40$$ W 3 $$54$$ W 4 $$4$$ W
Subtopic:  Heating Effects of Current |
87%
From NCERT
AIPMT - 2007
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An electric kettle takes $$4~\text{A}$$ current at $$220~\text{V}$$. How much time will it take to boil $$1$$ kg of water at a temperature of $$20^{\circ}\text{C}$$? The temperature of boiling water is $$100^{\circ}\text{C}$$.
1. $$6.3$$ min
2. $$8.4$$ min
3. $$12.6$$ min
4. $$4.2$$ min
Subtopic:  Heating Effects of Current |
51%
From NCERT
AIPMT - 2008
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A current of $$3~\text{A}$$ flows through the $$2~\Omega$$ resistor shown in the circuit. The power dissipated in the $$5~\Omega$$ resistor is:

 1 $$4~\text{W}$$ 2 $$2~\text{W}$$ 3 $$1~\text{W}$$ 4 $$5~\text{W}$$
Subtopic:  Heating Effects of Current |
80%
From NCERT
AIPMT - 2008
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