# 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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When a $$100$$ W, $$240$$ V bulb is operated at $$200$$ volt, the current in it is:
1. $$0.35~\text{A}$$
2. $$0.42~\text{A}$$
3. $$0.50~\text{A}$$
4. $$0.58~\text{A}$$

Subtopic:  Heating Effects of Current |
62%
From NCERT
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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. $$\frac{5 R}{6}$$

2. $$\frac{6 R}{5}$$

3. $$12 R$$

4. $$3 R$$

Subtopic:  Kirchoff's Voltage Law |
71%
From NCERT
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Three voltmeters are connected as shown.

A potential difference is applied between $$A$$ and $$B$$. On closing the switch $$S$$, readings of voltmeter(s):
 1 $${V_1}$$ increases. 2 $${V_2}$$ increases. 3 $${V_2}$$ & $${V_3}$$ both increases. 4 one of $$V_2$$ & $${V_3}$$ increases and $${V_1}$$ decreases.
Subtopic:  Combination of Resistors |
51%
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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A constant voltage is applied between the two ends of a uniform metallic wire. Some heat is developed in it. The heat developed doubles if:

 1 both the length and the radius of the wire are halved. 2 both the length and the radius of the wire are doubled. 3 the radius of the wire is doubled. 4 The length of the wire is doubled.

Subtopic:  Heating Effects of Current |
52%
From NCERT
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A $$50$$ kW dc generator produces a potential difference of $$250$$ V. If the resistance of the transmission line is $$1~\Omega$$, what percentage of the original power is lost during transmission?
1. $$80\%$$
2. $$40\%$$
3. $$20\%$$
4. $$10\%$$

Subtopic:  Heating Effects of Current |
From NCERT
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A current of $$2$$ A is to be sent through a resistor of $$5 ~\Omega.$$ Number of cells required in series, if each has emf $$2$$ V and internal resistance $$0.5~\Omega,$$ are:
1. $$40$$
2. $$30$$
3. $$20$$
4. $$10$$

Subtopic:  Grouping of Cells |
76%
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 |
78%
From NCERT
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