Chapter 12 · Electricity

NCERT Exemplar Class 10 Science Chapter 12 Multiple Choice Questions

All 18 questions of NCERT Exemplar Class 10 Science Chapter 12 Multiple Choice Questions (Electricity), in the book's order, each with its answer and a step-by-step solution.

1. Q1
   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
   Show answer

   (d) the same in all the cases

   Step-by-step solution →
2. Q2
   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)

   Step-by-step solution →
3. Q3
   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
   Show answer

   (d) nature of the material

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4. Q4
   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)$10^{23}$
   Show answer

   (a) $10^{20}$

   Step-by-step solution →
5. Q5
   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)

   Step-by-step solution →
6. Q6
   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) $1\Omega$

   Step-by-step solution →
7. Q7
   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) $1/25\Omega$

   Step-by-step solution →
8. Q8
   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 →
9. Q9
   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
   Show answer

   (a) $\frac{\text{Work done}}{\text{Current}\times \text{Time}}$

   Step-by-step solution →
10. Q10
    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)$3A$
    Show answer

    (c) $2A$

    Step-by-step solution →
11. Q11
    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 →
12. Q12
    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 %
    Show answer

    (c) 300 %

    Step-by-step solution →
13. Q13
    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
    Show answer

    (c) the shape of the resistor is changed

    Step-by-step solution →
14. Q14
    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 →
15. Q15
    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
    Show answer

    (c) 20 J

    Step-by-step solution →
16. Q16
    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
    Show answer

    (d) 5 A

    Step-by-step solution →
17. Q17
    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
    Show answer

    (b) same current flowing through them when connected in series

    Step-by-step solution →
18. Q18
    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 →