Current Electricity — DPP 1

20 NEET questions from Current Electricity, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
The resistance across AB is;
Current Electricity – NEET-10045
  1. A $\frac { 5 } { 8 } R$
  2. B $\frac { 7 } { 8 } R$
  3. C 1R
  4. D 2R
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Correct answer: A

2
In the shown V-I curve $\frac { R _ { 1 } } { R _ { 2 } }$ will be:
Current Electricity – NEET-9969
  1. A $1 : \sqrt { 3 }$
  2. B $\sqrt { 3 } : 1$
  3. C 1 : 1
  4. D 1 : 3
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Correct answer: B

3
The resistivty of a wire depends on its
  1. A Length
  2. B Area of cross-section
  3. C Shape
  4. D Material
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Correct answer: D

4
A copper coil has a resistance of 20.0 Ω at $0 ^ { \circ } \mathrm { C }$ and a resistance of 26.4 Ω at $80 ^ { \circ } \mathrm { C }$. Find the temperature coefficient of resistance of copper.
  1. A $4 \times 10 ^ { - 2 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$
  2. B $2 \times 10 ^ { - 3 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$
  3. C $2 \times 10 ^ { - 2 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$
  4. D $4 \times 10 ^ { - 3 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$
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Correct answer: D

5
In the circuit element given here, if the potential difference at point B is V$_{B}$ = 0, then the potential A & D are;
Current Electricity – NEET-10036
  1. A $V _ { A } = - 1.5 \mathrm {~V} , V _ { D } = + 2 \mathrm {~V}$
  2. B $V _ { A } = - 1.5 \mathrm {~V} , V _ { D } = + 0.5 \mathrm {~V}$
  3. C $V _ { A } = + 1.5 \mathrm {~V} , V _ { D } = + 0.5 \mathrm {~V}$
  4. D $V _ { A } = + 1.5 \mathrm {~V} , V _ { D } = - 0.5 \mathrm {~V}$
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Correct answer: D

6
In the circuit shown in figure, equivalent resistance between A and B is
Current Electricity – NEET-10043
  1. A 8 Ω
  2. B 15 Ω
  3. C $\frac { 3 } { 2 } \Omega$
  4. D 12 Ω
Show answer

Correct answer: C

7
In the network shown in the figure, each of the resistance is equal to 2 Ω. The resistance between the points A and B is
Current Electricity – NEET-10073
  1. A 3 Ω
  2. B 4 Ω
  3. C 1 Ω
  4. D 2 Ω
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Correct answer: D

8
Five resistances are connected as shown in the figure. The effective resistance between the point A and B is;
Current Electricity – NEET-10071
  1. A $\frac { 10 } { 3 } \Omega$
  2. B $\frac { 20 } { 3 } \Omega$
  3. C 15 Ω
  4. D 6 Ω
Show answer

Correct answer: A

9
A current of 10 A is maintained in a conductor of crosssection 1 cm$^{2}$. If the number density of free electrons be $9 \times 10 ^ { 28 } \mathrm {~m} ^ { - 3 }$, the drift velocity of free electrons is
  1. A $6.94 \times 10 ^ { - 6 } \mathrm {~m} / \mathrm { s }$
  2. B $5.94 \times 10 ^ { - 2 } \mathrm {~m} / \mathrm { s }$
  3. C $1.94 \times 10 ^ { - 3 } \mathrm {~m} / \mathrm { s }$
  4. D $2.94 \times 10 ^ { - 4 } \mathrm {~m} / \mathrm { s }$
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Correct answer: A

10
Why is the Wheatstone bridge better than the other methods of measuring resistances?
  1. A It is a null method
  2. B It has four resistor arms
  3. C It is based on Kirchoff's law
  4. D It does not involve Ohm's law
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Correct answer: A

11
At what temperature, would the resistance of a copper wire be double its resistance at $0 ^ { \circ } \mathrm { C }$ ? if $\alpha = \frac { 1 } { 273 } \mathrm { C } ^ { - 1 }$
  1. A $373 ^ { \circ } \mathrm { C }$
  2. B $173 ^ { \circ } \mathrm { C }$
  3. C $273 ^ { \circ } \mathrm { C }$
  4. D $300 ^ { \circ } \mathrm { C }$
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Correct answer: C

12
In the given network, the equivalent resistance between A and B is
Current Electricity – NEET-10042
  1. A 6 Ω
  2. B 16 Ω
  3. C 7 Ω
  4. D 5 Ω
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Correct answer: D

13
The current through a wire depends on time as i = (2 + 3t)A. Calculate the charge crossed through a cross section of the wire in first 10 seconds.
  1. A 150 C
  2. B 165 C
  3. C 175 C
  4. D 170 C
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Correct answer: D

14
A piece of wire is cut into four equal parts and the pieces are bundled together side by side to form a thicker wire. Compared with that of the original wire, the resistance of the bundle is;
  1. A Same
  2. B $\frac { 1 } { 16 }$ th of original
  3. C $\frac { 1 } { 8 }$ th of original
  4. D $\frac { 1 } { 4 }$ th of original
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Correct answer: B

15
Twelve identical resistance each of resistance $R$ are connected as shown in figure. Find the net resistance between X and Y.
Current Electricity – NEET-10075
  1. A $\frac { 2 R } { 5 }$
  2. B $\frac { R } { 5 }$
  3. C $\frac { 2 } { 5 R }$
  4. D $\frac { 3 R } { 5 }$
Show answer

Correct answer: A

16
An EMF source of 8.0 V is connected to a purely resistive electrical appliance (a light bulb). An electric current of 2.0 A flows through it. Consider the conducting wires to be resistance-free. Calculate the resistance offered by the electrical appliance.
  1. A 4 Ω
  2. B 8 Ω
  3. C 12 Ω
  4. D 16 Ω
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Correct answer: A

17
Two wires of resistance R$_{1}$ and R$_{2}$ have temperature co-efficient of resistance α$_{1}$ and α$_{2}$ respectively. These are joined in series. The effective temperature co-efficient of resistance is:
  1. A $\frac { \alpha _ { 1 } + \alpha _ { 2 } } { 2 }$
  2. B $\sqrt { \alpha _ { 1 } \alpha _ { 2 } }$
  3. C $\frac { \alpha _ { 1 } R _ { 1 } + \alpha _ { 2 } R _ { 2 } } { R _ { 1 } + R _ { 2 } }$
  4. D $\sqrt { \frac { R _ { 1 } R _ { 2 } \alpha _ { 1 } \alpha _ { 2 } } { \sqrt { R _ { 1 } ^ { 2 } + R _ { 2 } ^ { 2 } } } }$
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Correct answer: C

18
The V-I graph for a conductor at temperatures T$_{1}$ and T$_{2}$ are shown in the figure. (T$_{2}$ - T$_{1}$) is proportional to
Current Electricity – NEET-10031
  1. A cos 2θ
  2. B sin θ
  3. C cot 2θ
  4. D tan θ
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Correct answer: C

19
A cylindrical wire has a resistance R and resistivity ρ. If its length and diameter are both cut in half, its resistivity will now be:
  1. A 3ρ
  2. B 4ρ
  3. C 2ρ
  4. D ρ
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Correct answer: D

20
Three resistances are connected to form a T-shape as shown in the figure. Then, the current i in the 2 Ω resistor is;
Current Electricity – NEET-10037
  1. A 0.93 A
  2. B 4.5 A
  3. C 2.5 A
  4. D 1.57 A
Show answer

Correct answer: B

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