Class 10 Science · Chapter 11

Electricity

218 Class 10 Science questions on Electricity from the NCERT textbook, NCERT Exemplar and CBSE board papers 2023–2026, each with its answer and a step-by-step solution.

CBSE Class 10 Science previous year papers, with answers →

Questions · page 3 of 11

1. Q41 NCERT · Intext Questions (Page 192)
   An electric motor takes $5$ A from a $220$ ​V line. ​Determine ​the ​power of the motor and the energy ​consumed in $2$ h.
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   The motor's power is $P=1100$ W (1.1 kW), and it consumes $7.92\times 10^6$ J (2.2 kW h) in 2 h.

   The power of the motor is $P=VI=220\text{V}\times 5\text{A}=1100$ W $=1.1$ kW. Taking $2$ h $=7200$ s, the energy consumed is $E=Pt=1100\text{W}\times 7200\text{s}=7.92\times 10^6$ J, which in commercial units is $1.1\text{kW}\times 2\text{h}=2.2$ kW h.

   Step-by-step solution →
2. Q42 Exemplar · Multiple Choice Questions
   A cell, ​a resistor, ​a key and ammeter are arranged as shown in the circuit diagrams of ​Figure12.1. ​The current ​recorded in ​the ​ammeter will ​be

   1. (a)maximum in (i)
   2. (b)maximum in (ii)
   3. (c)maximum in (iii)
   4. (d)the same in all the cases
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   (d) the same in all the cases

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3. Q43 Exemplar · Multiple Choice Questions
   In the ​following ​circuits (Figure 12.2), heat produced in the resistor or combination ​of ​resistors connected ​to a 12 V ​battery will ​be

   1. (a)same in all the cases
   2. (b)minimum in case (i)
   3. (c)maximum in case (ii)
   4. (d)maximum in case (iii)
   Show answer

   (d) maximum in case (iii)

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4. Q44 Exemplar · Multiple Choice Questions
   Electrical resistivity ​of a given ​metallic ​wire ​depends ​upon

   1. (a)its length
   2. (b)its thickness
   3. (c)its shape
   4. (d)nature of the material
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   (d) nature of the material

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5. Q45 Exemplar · Multiple Choice Questions
   A ​current of 1 ​A ​is drawn by a filament of an electric bulb. Number of ​electrons passing ​through a cross section of the filament in ​16 seconds would be ​roughly

   1. (a)$10^{20}$
   2. (b)$10^{16}$
   3. (c)$10^{18}$
   4. (d)$10^{23}$
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   (a) $10^{20}$

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6. Q46 Exemplar · Multiple Choice Questions
   Identify the circuit (Figure ​12.3) ​in ​which ​the electrical ​components have been properly connected.

   1. (a)(i)
   2. (b)(ii)
   3. (c)(iii)
   4. (d)(iv)
   Show answer

   (b) (ii)

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7. Q47 Exemplar · Multiple Choice Questions
   What is the maximum ​resistance ​which can ​be made using ​five ​resistors each of ​1/5 Ω?

   1. (a)$1/5\Omega$
   2. (b)$10\Omega$
   3. (c)$5\Omega$
   4. (d)$1\Omega$
   Show answer

   (d) $1\Omega$

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8. Q48 Exemplar · Multiple Choice Questions
   What is the minimum ​resistance ​which can ​be ​made using ​five ​resistors each of 1/5 Ω?

   1. (a)$1/5\Omega$
   2. (b)$1/25\Omega$
   3. (c)$1/10\Omega$
   4. (d)$25\Omega$
   Show answer

   (b) $1/25\Omega$

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9. Q49 Exemplar · Multiple Choice Questions
   The ​proper representation ​of series combination ​of ​cells ​(Figure ​12.4) obtaining maximum ​potential is

   1. (a)(i)
   2. (b)(ii)
   3. (c)(iii)
   4. (d)(iv)
   Show answer

   (a) (i)

   Step-by-step solution →
10. Q50 Exemplar · Multiple Choice Questions
    Which of ​the ​following represents ​voltage?

    1. (a)$\frac{\text{Work done}}{\text{Current}\times \text{Time}}$
    2. (b)Work done $\times$ Charge
    3. (c)$\frac{\text{Work done}\times \text{Time}}{\text{Current}}$
    4. (d)Work done $\times$ Charge $\times$ Time
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    (a) $\frac{\text{Work done}}{\text{Current}\times \text{Time}}$

    Step-by-step solution →
11. Q51 Exemplar · Multiple Choice Questions
    A cylindrical ​conductor ​of length $l$ and uniform area of ​cross-section $A$ has ​resistance $R$. Another conductor ​of length $2l$ and resistance $R$ of the ​same material has ​area of cross ​section

    1. (a)$A/2$
    2. (b)$3A/2$
    3. (c)$2A$
    4. (d)$3A$
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    (c) $2A$

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12. Q52 Exemplar · Multiple Choice Questions
    A ​student carries out an experiment ​and plots ​the V-I graph of three ​samples ​of nichrome wire with resistances $R_1$, $R_2$ and $R_3$ respectively ​(Figure.12.5). Which of ​the following is true?

    1. (a)$R_1=R_2=R_3$
    2. (b)$R_1>R_2>R_3$
    3. (c)$R_3>R_2>R_1$
    4. (d)$R_2>R_3>R_1$
    Show answer

    (c) $R_3>R_2>R_1$

    Step-by-step solution →
13. Q53 Exemplar · Multiple Choice Questions
    If the ​current $I$ ​through ​a resistor ​is increased by 100% (assume that temperature ​remains unchanged), ​the increase in power dissipated ​will ​be

    1. (a)100 %
    2. (b)200 %
    3. (c)300 %
    4. (d)400 %
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    (c) 300 %

    Step-by-step solution →
14. Q54 Exemplar · Multiple Choice Questions
    The resistivity does not ​change ​if

    1. (a)the material is changed
    2. (b)the temperature is changed
    3. (c)the shape of the resistor is changed
    4. (d)both material and temperature are changed
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    (c) the shape of the resistor is changed

    Step-by-step solution →
15. Q55 Exemplar · Multiple Choice Questions
    In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, ​60 W and 100 W respectively are connected in ​parallel to an ​electric ​source. ​Which of the following ​is likely to happen regarding their brightness?

    1. (a)Brightness of all the bulbs will be the same
    2. (b)Brightness of bulb A will be the maximum
    3. (c)Brightness of bulb B will be more than that of A
    4. (d)Brightness of bulb C will be less than that of B
    Show answer

    (c) Brightness of bulb B will be more than that of A

    Step-by-step solution →
16. Q56 Exemplar · Multiple Choice Questions
    In an electrical circuit ​two resistors ​of 2 Ω and 4 Ω respectively ​are ​connected in series to a ​6 V battery. The heat dissipated by the ​4 Ω resistor in 5 s will ​be

    1. (a)5 J
    2. (b)10 J
    3. (c)20 J
    4. (d)30 J
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    (c) 20 J

    Step-by-step solution →
17. Q57 Exemplar · Multiple Choice Questions
    An electric kettle consumes 1 kW of ​electric ​power ​when ​operated ​at 220 V. ​A fuse wire of what rating must ​be used for it?

    1. (a)1 A
    2. (b)2 A
    3. (c)4 A
    4. (d)5 A
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    (d) 5 A

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18. Q58 Exemplar · Multiple Choice Questions
    Two ​resistors of resistance 2 ​Ω ​and 4 Ω when connected ​to ​a battery ​will ​have

    1. (a)same current flowing through them when connected in parallel
    2. (b)same current flowing through them when connected in series
    3. (c)same potential difference across them when connected in series
    4. (d)different potential difference across them when connected in parallel
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    (b) same current flowing through them when connected in series

    Step-by-step solution →
19. Q59 Exemplar · Multiple Choice Questions
    Unit ​of electric ​power ​may also ​be ​expressed ​as

    1. (a)volt ampere
    2. (b)kilowatt hour
    3. (c)watt second
    4. (d)joule second
    Show answer

    (a) volt ampere

    Step-by-step solution →
20. Q60 Exemplar · Short Answer Questions
    A child has drawn the electric circuit to study Ohm’s law as ​shown in Figure 12.6. His teacher told that the ​circuit diagram needs correction. Study the circuit diagram and redraw it after ​making all ​corrections.

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    The ammeter must be in series, the voltmeter across $R$, meter terminals correct and cells aiding; redraw the circuit with these corrections.

    The diagram has four faults. (1) The ammeter is connected in parallel with the resistor $R$; it must be connected in series with $R$. (2) The voltmeter is connected in series in the main loop; it must be connected in parallel across $R$. (3) The ammeter terminals are reversed — the current arrives at its $-$ terminal; the $+$ terminal of each meter must face the $+$ terminal of the battery, so that the current enters each meter at its $+$ terminal. (4) The cells of the battery are not all the same way round — the two middle plates are both long, so two cells oppose the other two and the net emf would be zero; every cell must be joined with its $+$ plate to the $-$ plate of the next. The corrected circuit is a single series loop of battery (all cells aiding), plug key, ammeter and $R$, with the voltmeter joined across $R$ alone; it then gives $R=V/I$.

    Step-by-step solution →