Electricity : NCERT Exemplar

Multiple Choice Questions :

Q.1 A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of figure. The current recorded in the ammeter will be (a) Maximum in (i)

(b) Maximum in (ii)

(c) Maximum in (iii)

(d) The same in all the cases

Sol. (d)

Q.2 In the following circuits Figure ,heat produced in the resistor or combination of resistors connected to a 12 V battery will be (a) same in all the cases

(b) minimum in case (i)

(c) maximum in case (ii)

(d) maximum in case (iii)

Sol. (d)

Q.3 Electrical restivity of a given metallic wire depends upon

(a) Its length

(b) Its thickness

(c) Its shape

(d) Nature of the material

Sol. (d)

Q.4 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

(a) 1020

(b) 1016

(c) 1018

(d) 1023

Sol.  (a)

Q.5 Identify the circuit figure in which the electrical components have been properly connected. (a) (i)

(b) (ii)

(c) (iii)

(d) (iv)

Sol. (b)

Q.6 What is the maximum resistance which can be made using five resistors each of 1/5 Ω?

(a) 1/5 Ω

(b) 10 Ω

(c) 5 Ω

(d) 1 Ω

Sol. (d)

Q.7 What is the minimum resistance which can be made using five resistors each of 1/5 Ω?

(a) 1/5 Ω

(b) 1/25 Ω

(c) 1/10 Ω

(d) 25 Ω

Sol. (b)

Q.8 The proper representation of series combination of cells figure obtaining maximum potential is (a) (i)

(b) (ii)

(c) (iii)

(d) (iv)

Sol.(a)

Q.9 Which of the following represents voltage?

(a) (b) Work done × Charge

(c) (d) Work done × Charge × Time

Sol. (a)

Q.10 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

(a) A/2

(b) 3A/2

(c) 2A

(d) 3A

Sol. (c)

Q.11 A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1, R2 and R3 respectively figure. Which of the following is true? (a) R1 = R2 = R3

(b) R1 > R2 > R3

(c) R3 > R2 > R1

(d) R2 > R3 > R1

Sol. (c)

Q.12 If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be

(a) 100 %

(b) 200 %

(c) 300 %

(d) 400 %

Sol. (c)

Q.13 The resistivity does not change if

(a) The material is changed

(b) The temperature is changed

(c) The shape of the resistor is changed

(d) Both material and temperature are changed

Sol. (c)

Q.14 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?

(a) Brightness of all the bulbs will be the same

(b) Brightness of bulb A will be the maximum

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

(d) Brightness of bulb C will be less than that of B

Sol. (c)

Q.15 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

(a) 5 J

(b) 10 J

(c) 20 J

(d) 30 J

Sol. (c)

Q.16 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?

(a) 1 A

(b) 2 A

(c) 4 A

(d) 5 A

Sol. (d)

Q.17 Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have

(a) Same current flowing through them when connected in parallel

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

(c) Same potential difference across them when connected in series

(d) Different potential difference across them when connected in parallel

Sol. (b)

Q.18 Unit of electric power may also be expressed as

(a) Volt ampere

(b) Kilowatt hour

(c) Watt second

(d) Joule second

Sol. (a)

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