#### 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 points#### The formula to find I when the values of V and R are known is

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##### 2. Question

1 points#### A 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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##### 3. Question

1 points#### You 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?

CorrectIncorrect - Question 4 of 20
##### 4. Question

1 points#### If 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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##### 5. Question

1 points#### Two 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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##### 6. Question

1 points#### Ampere second could be the unit of

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##### 7. Question

1 points#### An electric current of 5 A is same as

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##### 8. Question

1 points#### An 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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##### 9. Question

1 points#### The value of the following is given by 100 (kilo ampere ) x ( micro ampere ) 100 milli ampere * 10 ampere

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### A circuit contains two un-equal resistances in parallel

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### Which method can be used for absolute measurement of resistances ?

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##### 12. Question

1 points#### Three 3 ohm resistors are connected to form a triangle. What is the resistance between any two of the corners?

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### How many different combinations may be obtained with three resistors, each having the resistance R ?

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### Ohm’s law is not applicable to

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### A 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

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### A metal resistor has resistance of 10 ohm at 0°C and 11 ohms at 160°C, the temperature coefficient is

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### Voltage between point P and Q will be

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##### 18. Question

1 points#### The current in 4 ohm resistor will be

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##### 19. Question

1 points#### Least current will flow through

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##### 20. Question

1 points#### Total 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

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### If doubling the voltage across a resistor doubles the current through the resistor then

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##### 3. Question

1 points#### If the voltage across a fixed value of resistance is increased five times, what does the current do?

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##### 4. Question

1 points#### If the resistance in a circuit with constant voltage increases, the current will

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##### 5. Question

1 points#### What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h?

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##### 6. Question

1 points#### A damaged resistor

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##### 7. Question

1 points#### Power supplies differ from batteries in that

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##### 8. Question

1 points#### If voltage across a resistance doubles

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##### 9. Question

1 points#### Ohm’s law describes the mathematical relationship between

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##### 10. Question

1 points#### Energy is defined as the ability to

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##### 11. Question

1 points#### The rate at which work is performed is called

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##### 12. Question

1 points#### A battery’s capacity to deliver power is measured in

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##### 13. Question

1 points#### Power supplies are regulated to prevent the output voltage from changing due to changes in the

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##### 14. Question

1 points#### If current through a resistance is halved

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### Ohm’s law is a relationship between

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##### 16. Question

1 points#### Resistivity of a wire depends on

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##### 17. Question

1 points#### When 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

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is

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##### 19. Question

1 points#### Kirchhoff’s second law is based on law of conservation of

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##### 20. Question

1 points#### The 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 points#### A resistance of 5 ohms is further drawn so that its length becomes double. Its resistance will now be

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### Specific resistance of a substance is measured in

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##### 3. Question

1 points#### A wire of resistance R has it length and cross-section both doubled. Its resistance will become

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##### 4. Question

1 points#### Ohm’s law is not applicable in all the following cases Except

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##### 5. Question

1 points#### Conductance is expressed in terms of

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##### 6. Question

1 points#### We 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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##### 7. Question

1 points#### Three 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?

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### Four identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### The unit of electrical conductivity is

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##### 10. Question

1 points#### Which of the following bulbs will have the least resistance ?

CorrectIncorrect - Question 11 of 20
##### 11. Question

1 points#### The ratio of the resistance of a 100 W, 220 V lamp to that of a 100 W, 110 V lamp will be nearly

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### The resistance of a 100 W, 200 V lamp is

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### The element of electric heater is made of

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##### 14. Question

1 points#### The element of electric heater is made of

CorrectIncorrect - Question 15 of 20
##### 15. Question

1 points#### The variation of resistance of iron and some alloys with temperature is shown in figure. The variation of carbon will be represented by

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### Curves A and B represent the properties for materials which have

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##### 17. Question

1 points#### Which of the following has negative temperature coefficient ?

CorrectIncorrect - Question 18 of 20
##### 18. Question

1 points#### All of the following have negative temperature coefficient EXCEPT

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##### 19. Question

1 points#### A 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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##### 20. Question

1 points#### Two 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 points#### A 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

CorrectIncorrect - Question 2 of 20
##### 2. Question

1 points#### Variable resistors are

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##### 3. Question

1 points#### Low resistance can be accurately measured by

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##### 4. Question

1 points#### A 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

CorrectIncorrect - Question 5 of 20
##### 5. Question

1 points#### Temperature coefficient of resistance is expressed in terms of

CorrectIncorrect - Question 6 of 20
##### 6. Question

1 points#### Resistivity is usually expressed in terms of

CorrectIncorrect - Question 7 of 20
##### 7. Question

1 points#### Which material is expected to have least resistivity?

CorrectIncorrect - Question 8 of 20
##### 8. Question

1 points#### The 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

CorrectIncorrect - Question 9 of 20
##### 9. Question

1 points#### The resistance temperature coefficient is defined as

CorrectIncorrect - Question 10 of 20
##### 10. Question

1 points#### Two 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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##### 11. Question

1 points#### A 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

CorrectIncorrect - Question 12 of 20
##### 12. Question

1 points#### The rating of fuse wire is expressed in terms of

CorrectIncorrect - Question 13 of 20
##### 13. Question

1 points#### Which of the following material is not used as fuse material?

CorrectIncorrect - Question 14 of 20
##### 14. Question

1 points#### The voltage drop across the resistor 9 ohm will be

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##### 15. Question

1 points#### Total power dissipated in the circuit is

CorrectIncorrect - Question 16 of 20
##### 16. Question

1 points#### The current carrying capacity of the fuse material depends on

CorrectIncorrect - Question 17 of 20
##### 17. Question

1 points#### For the circuit shown in Figure above, the value of current I will be

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##### 18. Question

1 points#### The combined resistance of the circuit is

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##### 19. Question

1 points#### A 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?

CorrectIncorrect - Question 20 of 20
##### 20. Question

1 points#### An immersion rod heats a bucket of water in 15 minutes. In order that the water should boil in 10 minutes

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