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Chapter 12 : Electricity
GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR DISTRICT
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1) A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams in given figure. The current recorded in the ammeter will be :
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(a) maximum in (i)
(b) maximum in (ii)
(c) maximum in (iii)
(d) the same in all the cases
2) In the following circuits, heat produced in the resistor or combination of resistors connected to a 12 V battery will be :
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(a) same in all the cases
(b) minimum in case (i)
(c) maximum in case (ii)
(d) maximum in case (iii)
3) Electrical resistivity of a given metallic wire depends upon :
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(a) its length
(b) its thickness
(c) its shape
(d) nature of the material
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 16seconds would be roughly:
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(a) 10^20
(b) 10^16
(c) 10^18
(d) 10^23
5) Identify the circuit in which the electrical components have been properly connected :
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(a)
(b)
(c)
(d)
6) What is the maximum resistance which can be made using five resistors each of 1/5 Ω?
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(a) 1/5 Ω
(b) 10 Ω
(c) 5 Ω
(d) 1 Ω
7) What is the minimum resistance which can be made using five resistors each of 1/5 Ω?
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(a) 1/5 Ω
(b) 1/25 Ω
(c) 1/10 Ω
(d) 25 Ω
8) The proper representation of series combination of cells obtaining maximum potential is :
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(a)
(b)
(c)
(d)
9) Which of the following represents voltage?
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(a) Work done / (Current × Time)
(b) Work done x Charge
(c) (Work done × Time) / Current
(d) Work done x Charge x Time
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 :
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(a) A/2
(b) 3A/2
(c) 2A
(d) 3A
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. Which of the following is true?
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(a) R1 = R2 = R3
(b) R1 > R2 > R3
(c) R3 > R2 > R1
(d) R2 > R3 > R1
12) If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
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(a) 100 %
(b) 200 %
(c) 300 %
(d) 400 %
13) The resistivity does not change if :
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(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
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?
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(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
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 :
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(a) 5 J
(b) 10 J
(c) 20 J
(d) 30 J
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?
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(a) 1 A
(b) 2 A
(c) 4 A
(d) 5 A
17) Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have :
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(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
18) Unit of electric power may also be expressed as :
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(a) volt ampere
(b) kilowatt hour
(c) watt second
(d) joule second
19) Three 2 Ω resistors, A, B and C, are connected as shown in the figure. Each of them dissipates energy and can withstand a maximum power of 18W without melting. Find the maximum current that can flow through the three resistors?
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(a) Resistor A= 3 A and Resistors B & C = 4 A
(b) Resistor A= 1.5 A and Resistors B & C = 3 A
(c) Resistor A= 2 A and Resistors B & C = 4 A
(d) Resistor A= 3 A and Resistors B & C = 1.5 A
20) The commercial unit of electrical energy is :
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(a) W
(b) kW h
(c) calorie
(d) J
21) A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R′, then the ratio R/R′ is :
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(a) 1/25
(b) 1/5
(c) 5
(d) 25
22) Which of the following terms does not represent electrical power in a circuit ?
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(a) I^2 R
(b) IR^2
(c) VI
(d) V^2/R
23) An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be :
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(a) 100 W
(b) 75 W
(c) 50 W
(d) 25 W
24) Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential difference. The ratio of heat produced in series and parallel combinations would be :
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(a) 1 : 2
(b) 2 : 1
(c) 1 : 4
(d) 4 : 1
25) How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
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(a) 1
(b) 2
(c) 3
(d) 4
26) Factor that doesn't affect resistance is :
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(a) length
(b) material
(c) radius
(d) time
27) Unit of specific resistance is :
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(a) Ω/m
(b) Ω m
(c) Ω
(d) Ωm^2
28) One coulomb of charge is due to ____ number of electrons :
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(a) 1
(b) 1.6 x 10 ^-19
(c) 6.25 x 10 ^18
(d) 6.25 x 10 ^ -19
29) One coulomb of charge is due to ____ number of electrons :
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(a) 1
(b) 1.6 x 10 ^-19
(c) 6.25 x 10 ^18
(d) 6.25 x 10 ^ -19
30) Which of the following appliance doesn't work based on heating effect of electric current ?
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(a) Fuse
(b) Electric bell
(c) Electric bulb
(d) Electric Iron box
31) Which gas is filled in electric bulb ?
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(a) Oxygen
(b) Hydrogen
(c) Neon
(d) Nitrogen
32) Fuse wire is made up of an alloy of lead and tin because :
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(a) high melting point and high resistivity
(b) low melting point and high resistivity
(c) low melting point and low resistivity
(d) high melting point and low resistivity
33) Ohm's law is valid only at :
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(a) constant temperature
(b) constant physical conditions
(c) both a and b
(d) none of the above
34) The given symbol represents :
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(a) Battery
(b) Resistor
(c) Wire joint
(d) Rheostat
34) Symbol for Wires crossing without joining is :
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(a)
(b)
(c)
(d)
A SCHEMATIC DIAGRAM OF AN ELECTRIC CIRCUIT COMPRISING - CELL, ELECTRIC BULB, AMMETER AND PLUG KEY :
SYMBOLS OF SOME COMMONLY USED COMPONENTS IN CIRCUIT DIAGRAMS :
ELECTRIC CIRCUIT FOR STUDYING OHM'S LAW :
RESISTORS IN SERIES :
RESISTORS IN PARALLEL :
GOPALA RAO C K, GHS (RMSA) THORALAKKI, MALUR TALUK, KOLAR-563137
Reference : 10th Science Exemplar and DSERT Textbook Class 10
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