The Following Section consists of Multiple Choice Questions on Ohm’s Law.
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Ohm’s Law MCQ
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Question 1 of 20
1. Question
1 pointsThe formula to find I when the values of V and R are known is
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Question 2 of 20
2. Question
1 pointsA resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver?
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Question 3 of 20
3. Question
1 pointsYou are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed?
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Question 4 of 20
4. Question
1 pointsIf you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be?
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Question 5 of 20
5. Question
1 pointsTwo bulbs marked 200 watt-250 volts and 100 watt-250 volts are joined in series to 250 volts supply. Power consumed in circuit is
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Question 6 of 20
6. Question
1 pointsAmpere second could be the unit of
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Question 7 of 20
7. Question
1 pointsAn electric current of 5 A is same as
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Question 8 of 20
8. Question
1 pointsAn electron of mass m kg and having a charge of e coulombs travels from rest through a potential difference of V volts. Its kinetic energy will be
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Question 9 of 20
9. Question
1 pointsThe value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere
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Question 10 of 20
10. Question
1 pointsA circuit contains two un-equal resistances in parallel
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Question 11 of 20
11. Question
1 pointsWhich method can be used for absolute measurement of resistances ?
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Question 12 of 20
12. Question
1 pointsThree 3 ohm resistors are connected to form a triangle. What is the resistance between any two of the corners?
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Question 13 of 20
13. Question
1 pointsHow many different combinations may be obtained with three resistors, each having the resistance R ?
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Question 14 of 20
14. Question
1 pointsOhm’s law is not applicable to
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Question 15 of 20
15. Question
1 pointsA wire of 0.14 mm diameter and specific resistance 9.6 micro ohm-cm is 440 cm long. The resistance of the wire will be
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Question 16 of 20
16. Question
1 pointsA metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature coefficient is
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Question 17 of 20
17. Question
1 pointsVoltage between point P and Q will be
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Question 18 of 20
18. Question
1 pointsThe current in 4 ohm resistor will be
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Question 19 of 20
19. Question
1 pointsLeast current will flow through
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Question 20 of 20
20. Question
1 pointsTotal power loss in the circuit is
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Ohm’s Law MCQ 2
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Question 1 of 20
1. Question
1 points“Half-splitting” is
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Question 2 of 20
2. Question
1 pointsIf doubling the voltage across a resistor doubles the current through the resistor then
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Question 3 of 20
3. Question
1 pointsIf the voltage across a fixed value of resistance is increased five times, what does the current do?
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Question 4 of 20
4. Question
1 pointsIf the resistance in a circuit with constant voltage increases, the current will
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Question 5 of 20
5. Question
1 pointsWhat is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h?
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Question 6 of 20
6. Question
1 pointsA damaged resistor
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Question 7 of 20
7. Question
1 pointsPower supplies differ from batteries in that
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Question 8 of 20
8. Question
1 pointsIf voltage across a resistance doubles
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Question 9 of 20
9. Question
1 pointsOhm’s law describes the mathematical relationship between
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Question 10 of 20
10. Question
1 pointsEnergy is defined as the ability to
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Question 11 of 20
11. Question
1 pointsThe rate at which work is performed is called
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Question 12 of 20
12. Question
1 pointsA battery’s capacity to deliver power is measured in
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Question 13 of 20
13. Question
1 pointsPower supplies are regulated to prevent the output voltage from changing due to changes in the
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Question 14 of 20
14. Question
1 pointsIf current through a resistance is halved
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Question 15 of 20
15. Question
1 pointsOhm’s law is a relationship between
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Question 16 of 20
16. Question
1 pointsResistivity of a wire depends on
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Question 17 of 20
17. Question
1 pointsWhen n resistances each of value r are connected in parallel, then resultant resistance is x. When these n resistances are connected in series, total resistance is
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Question 18 of 20
18. Question
1 pointsResistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is
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Question 19 of 20
19. Question
1 pointsKirchhoff’s second law is based on law of conservation of
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Question 20 of 20
20. Question
1 pointsThe mass of proton is roughly how many times the mass of an electron?
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Ohm’s Law MCQ 3
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Question 1 of 20
1. Question
1 pointsA resistance of 5 ohms is further drawn so that its length becomes double. Its resistance will now be
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Question 2 of 20
2. Question
1 pointsSpecific resistance of a substance is measured in
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Question 3 of 20
3. Question
1 pointsA wire of resistance R has it length and cross-section both doubled. Its resistance will become
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Question 4 of 20
4. Question
1 pointsOhm’s law is not applicable in all the following cases Except
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Question 5 of 20
5. Question
1 pointsConductance is expressed in terms of
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Question 6 of 20
6. Question
1 pointsWe have three resistances of values 2 Ω, 3 Ω and 6 Ω. Which of the following combination will give an effective resistance of 4 Ω?
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Question 7 of 20
7. Question
1 pointsThree equal resistors connected in series across a source of emf together dissipate 10 watts of power. What would be the power dissipated in the same resistors when they are connected in parallel across the same source of emf?
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Question 8 of 20
8. Question
1 pointsFour identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
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Question 9 of 20
9. Question
1 pointsThe unit of electrical conductivity is
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Question 10 of 20
10. Question
1 pointsWhich of the following bulbs will have the least resistance ?
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Question 11 of 20
11. Question
1 pointsThe ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly
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Question 12 of 20
12. Question
1 pointsThe resistance of a 100 W, 200 V lamp is
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Question 13 of 20
13. Question
1 pointsThe element of electric heater is made of
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Question 14 of 20
14. Question
1 pointsThe element of electric heater is made of
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Question 15 of 20
15. Question
1 pointsThe variation of resistance of iron and some alloys with temperature is shown in figure. The variation of carbon will be represented by
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Question 16 of 20
16. Question
1 pointsCurves A and B represent the properties for materials which have
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Question 17 of 20
17. Question
1 pointsWhich of the following has negative temperature coefficient ?
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Question 18 of 20
18. Question
1 pointsAll of the following have negative temperature coefficient EXCEPT
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Question 19 of 20
19. Question
1 pointsA cube of material of side 1 cm has a resistance of 0.002 ohm between its opposite faces. If the same volume of the material has a length of 8 cm and a uniform cross-section, the resistance of this length will be
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Question 20 of 20
20. Question
1 pointsTwo aluminium conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 100 ohms the resistance of other conductor will be
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Ohm’s Law MCQ 4
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Question 1 of 20
1. Question
1 pointsA nichrome wire used as heater coil has the resistance of 1 ohm/m. For a heater of 1000 W at 200 V, the length of wire required will be
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Question 2 of 20
2. Question
1 pointsVariable resistors are
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Question 3 of 20
3. Question
1 pointsLow resistance can be accurately measured by
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Question 4 of 20
4. Question
1 pointsA heating element of a hot plate on an electric cooking range draws 12 amperes from 240 V mains. How many kWh of energy will be consumed in one hour and 15 minutes
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Question 5 of 20
5. Question
1 pointsTemperature coefficient of resistance is expressed in terms of
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Question 6 of 20
6. Question
1 pointsResistivity is usually expressed in terms of
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Question 7 of 20
7. Question
1 pointsWhich material is expected to have least resistivity?
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Question 8 of 20
8. Question
1 pointsThe shunt winding of a motor has a resistance of 85 ohm at 22oC. When the motor runs at full load, its resistance increases to 100 ohms. The resistance temperature coefficient of winding per 0oC is 0.004. The rise in temperature of the winding will be nearly
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Question 9 of 20
9. Question
1 pointsThe resistance temperature coefficient is defined as
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Question 10 of 20
10. Question
1 pointsTwo coils connected in series have resistance of 600 ohm and 300 ohm and temperature coefficients of 0.1% and 0.4% respectively.The resistance of the combination at 50oC will be
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Question 11 of 20
11. Question
1 pointsA 100 W, 200 V filament lamp has operating temperature of 2000oC. The filament material has resistance temperature coefficient of 0.005 at 0oC per oC. The current taken by the lamp at the instant of switching with 200 V supply with filament temperature of 20oC will be
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Question 12 of 20
12. Question
1 pointsThe rating of fuse wire is expressed in terms of
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Question 13 of 20
13. Question
1 pointsWhich of the following material is not used as fuse material?
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Question 14 of 20
14. Question
1 pointsThe voltage drop across the resistor 9 ohm will be
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Question 15 of 20
15. Question
1 pointsTotal power dissipated in the circuit is
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Question 16 of 20
16. Question
1 pointsThe current carrying capacity of the fuse material depends on
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Question 17 of 20
17. Question
1 pointsFor the circuit shown in Figure above, the value of current I will be
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Question 18 of 20
18. Question
1 pointsThe combined resistance of the circuit is
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Question 19 of 20
19. Question
1 pointsA 100 W bulb is connected in series with a room heater of 750 W. What will happen if the bulb is replaced by a 60W bulb?
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Question 20 of 20
20. Question
1 pointsAn immersion rod heats a bucket of water in 15 minutes. In order that the water should boil in 10 minutes
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