JEE Questions for Physics Current Electricity Ii Quiz 7 - MCQExams.com

In given circuit total power consumed is 150W. Then value of R =....
Physics-Current Electricity II-66911.png
  • 2 Ω
  • 6 Ω
  • 5 Ω
  • 4 Ω
What is current flowing through 5Ω resistor in the circuit given below?
Physics-Current Electricity II-66913.png
  • 1A
  • 2A
  • 3A
  • 4A
The figures below show the motion of electron is the absence and presence of eletric field in 10 sec. The drift velocity is....
Physics-Current Electricity II-66915.png

  • Physics-Current Electricity II-66916.png
  • 2)
    Physics-Current Electricity II-66917.png

  • Physics-Current Electricity II-66918.png

  • Physics-Current Electricity II-66919.png
Nine resistors each of resistance R are connected as shown in fig. The effective resistance between A and B is.
Physics-Current Electricity II-66921.png

  • Physics-Current Electricity II-66922.png
  • R

  • Physics-Current Electricity II-66923.png

  • Physics-Current Electricity II-66924.png
In a given circuit, resistance of each resistor is r. Then equivalent resistance between A and B=....
Physics-Current Electricity II-66926.png

  • Physics-Current Electricity II-66927.png
  • 2)
    Physics-Current Electricity II-66928.png

  • Physics-Current Electricity II-66929.png

  • Physics-Current Electricity II-66930.png

Physics-Current Electricity II-66932.png
  • 8A
  • 4A
  • 3A
  • 9A
Twelve resistance cach of resistance R are connected in the circuit as shown in figure. Net resistance between points A and C would be.
Physics-Current Electricity II-66934.png

  • Physics-Current Electricity II-66935.png
  • 2)
    Physics-Current Electricity II-66936.png
  • R

  • Physics-Current Electricity II-66937.png
In the figure all the seven resistances joined in the circuit have a value of 5Ω each the equivalent resistance of AB is....
Physics-Current Electricity II-66939.png
  • 35 Ω
  • 25 Ω
  • 7 Ω
  • 15 Ω
The effective resistance between the points A and B in the given network shown in figure will be.
Physics-Current Electricity II-66941.png
  • 9 Ω
  • 12 Ω
  • 18 Ω
  • 7.5 Ω
Thirteen resistances each of resistance RΩ are connected in the circuit as shown in the figure the effective resistance between A and B is....
Physics-Current Electricity II-66943.png

  • Physics-Current Electricity II-66944.png
  • 2)
    Physics-Current Electricity II-66945.png

  • Physics-Current Electricity II-66946.png
  • R
Five equal resistances each of resistances R are connected as shownin the figure A battery of V volt is connected between A and B. The current flowing in AFCEB will be.
Physics-Current Electricity II-66948.png

  • Physics-Current Electricity II-66949.png
  • 2)
    Physics-Current Electricity II-66950.png

  • Physics-Current Electricity II-66951.png

  • Physics-Current Electricity II-66952.png

Physics-Current Electricity II-66954.png
  • 3 Ω
  • 2 Ω
  • 1 Ω
  • 1.5 Ω
In the wheastone bridge shown below, in order to balance the bridge we must have
Physics-Current Electricity II-66956.png

  • Physics-Current Electricity II-66957.png
  • 2)
    Physics-Current Electricity II-66958.png

  • Physics-Current Electricity II-66959.png

  • Physics-Current Electricity II-66960.png
A wire has resistance of 24 Ω is bent in the following shape. The effective resistance between A and B is
Physics-Current Electricity II-66962.png
  • 24 Ω
  • 10 Ω

  • Physics-Current Electricity II-66963.png
  • None of these
The potential difference across 8 Ω resistance is 48V as shown in the figure. The value of potential differences across X and Y will be
Physics-Current Electricity II-66965.png
  • 180 V
  • 160 V
  • 140 V
  • 120 V
If power dissipated in 5Ω resistor in 20W, then power dissipated across 4Ω resistor will be.
Physics-Current Electricity II-66967.png
  • 1 W
  • 2 W
  • 3 W
  • 4 W
In the given curcuit, the value of current through 2Ω resistor is....
Physics-Current Electricity II-66969.png
  • 2 A
  • 4 A
  • Zero
  • 5A
A curent of 3A flows from A to B through the wire shown in figure If the potential at A is 45V, then the potential at B will be
Physics-Current Electricity II-66970.png
  • 17 V
  • 9 V
  • 12 V
  • 6 V
In the given figure, battery E is balanced on 55 cm length of potentiometer wire but when a resistance of 10 Ω is connected in parallel with the battery then it balances on 50cm length of the potenitometer wire then internal resistance r of the battery is.
Physics-Current Electricity II-66972.png
  • 1 Ω
  • 3 Ω
  • 10 Ω
  • 5 Ω
Form the graph between current I and voltage V shown below, identity the portion corresponding to negative resistance.
Physics-Current Electricity II-66974.png
  • AB
  • BC
  • CD
  • DE
Find the current in the differrent resistors shown in figure
Physics-Current Electricity II-66975.png
  • Zero
  • 2 Amp.
  • 2.2 Amp.
  • 4 Amp.
In the electric circuit shown, each cell has an e.m.f of 2V and internal resistance of 1Ω. The external resistance is 2Ω the value of the current (I) is
Physics-Current Electricity II-66977.png
  • 0.8 A
  • 0.6 A
  • 0.4 A
  • 0.1A
Neutral temperature of a thermocouple is defined as the temperature at which
  • The thermo e.m.f. changes sign
  • The thermo e.m.f. is maximum
  • The thermo e.m.f. is minimum
  • The thermo e.m.f. is zero
A circuit consists of five identical conductors as shown in figure the two similar conductors are added as indicated by the dotted lines. The ratio of resistances before and after addition will be....
Physics-Current Electricity II-66979.png

  • Physics-Current Electricity II-66980.png
  • 2)
    Physics-Current Electricity II-66981.png

  • Physics-Current Electricity II-66982.png

  • Physics-Current Electricity II-66983.png
A wire of resistor R is bent into a circular ring a circular ring of radius r Equivalent resistance between two points X and Y on its circumference, when angle xoy is α , can be given by
Physics-Current Electricity II-66984.png

  • Physics-Current Electricity II-66985.png
  • 2)
    Physics-Current Electricity II-66986.png

  • Physics-Current Electricity II-66987.png

  • Physics-Current Electricity II-66988.png

Physics-Current Electricity II-66990.png
  • 3 Ω
  • 2 Ω
  • 1 Ω
  • 1.5 Ω

Physics-Current Electricity II-66992.png

  • Physics-Current Electricity II-66993.png
  • 2)
    Physics-Current Electricity II-66994.png

  • Physics-Current Electricity II-66995.png

  • Physics-Current Electricity II-66996.png
If R1 and R2 are respectively the filament resistances of a 200 watt bulb and 100 watt bulb designed to operate on the same voltage, then
  • R1 is two times R2
  • R2 is two times R1
  • R2 is four times R1
  • R1 is four times R2
Three electric bulbs of 200 W, 200 W and 400 W are shown in figure. The resultant power of the combination is
Physics-Current Electricity II-66999.png
  • 800 W
  • 400 W
  • 200 W
  • 600W
When two resistances R1 and R2 are connected in series, they consume 12 W power. When they are connected in parallel, they consume 50 W power. What is the ratio of the powers of R1 and R2

  • Physics-Current Electricity II-67001.png
  • 4

  • Physics-Current Electricity II-67002.png
  • 3
  • 1
An electrical cable having a resistance of 0.2 Ω delivers 19 kW at 200 V DC to a factory. What is the efficiency of transmission?
  • 65%
  • 75%
  • 85%
  • 95%
The electric bulbs have tungsten filaments of same length. If one of them gives 60 watt and other 100 watt, then
  • 100 watt bulb has thicker filament
  • 60 watt bulb has thicker filament
  • Both filaments are of same thickness
  • It is possible to get different wattage unless the lengths are different
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
  • 1500
  • 5000
  • 15
  • 150
Two electric lamps of 40 watt each are connected in parallel. The power consumed by the combination will be
  • 20 watt
  • 60 watt
  • 80 watt
  • 100 watt
A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across a 220 volt lines. Which electric bulb will glow more brightly?
  • 25 watt bulb
  • 100 watt bulb
  • First 25 watt and then 100 watt
  • Both with same brightness
A resistor R1 dissipates power P when connected to a certain generator. If the resistor R2 is put in series with R1, the power dissipated by R1
  • Decreases
  • Increases
  • Remains the same
  • Any of the above depending upon the relative values of R1 and R2
An electric fan and a heater are marked as 100 watt, 220 volt and 1000 watt, 220 volt respectively. The resistance of the heater is
  • Zero
  • Greater than that of the fan
  • Less than that of the fan
  • Equal to that of the fan
According to Joule\'s law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to

  • Physics-Current Electricity II-67010.png
  • 2)
    Physics-Current Electricity II-67011.png

  • Physics-Current Electricity II-67012.png

  • Physics-Current Electricity II-67013.png
Two bulbs X and Y having same voltage rating and of power 40 watt and 60 watt respectively are connected in series across a potential difference of 300 volt, then
Physics-Current Electricity II-67015.png
  • X will glow brighter
  • Resistance of Y is greater than X
  • Heat produced in Y will be greater than X
  • Voltage drop in X will be greater than Y
Two identical heaters rated 220 volt, 1000 watt are placed in series with each other across 220 volt lines. If resistance does not change with temperature, then the combined power is
  • 1000 watt
  • 2000 watt
  • 500 watt
  • 4000 watt
A railway compartment is lit up by thirteen lamps each taking 2.1 amp at 15 volts. The heat generated per second in each lamp will be
  • 4.35 cal
  • 5.73 cal
  • 7.5 cal
  • 2.5 cal
A 5.0 amp current is setup in an external circuit by a 6.0 volt storage battery for 6.0 minutes. The chemical energy of the battery is reduced by
  • 1.08 × 104 J
  • 1.08 × 10–4 volt
  • 1.8 × 104 J
  • 1.8 × 104 volt
If current in an electric bulb changes by 1%, then the power will change by
  • 1%
  • 2%
  • 4%

  • Physics-Current Electricity II-67020.png
Two identical batteries, each of e.m.f. 2 volt and internal resistance 1.0 ohm are available to produce heat in an external resistance R = 0.5 ohm by passing a current through it. The maximum Joulean power that can be developed across R using these batteries is
  • 1.28 watt
  • 2.0 watt
  • 8/9 watt
  • 3.2 watt
A constant voltage is applied between the two ends of a metallic wire. If both the length and the radius of the wire are doubled, the rate of heat developed in the wire
  • Will be doubled
  • Will be halved
  • Will remain the same
  • Will be quadrupled
The heating coils rated at 220 volt and producing 50 cal/sec heat are available with the resistances 55Ω, 110Ω, 220Ω and 440Ω. The heater of maximum power will be of
  • 440Ω
  • 220Ω
  • 110Ω
  • 55Ω
The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use
  • 400Ω
  • 200Ω
  • 40Ω
  • 20Ω
An electric heater kept in vacuum is heated continuously by passing electric current. Its temperature
  • Will go on rising with time
  • Will stop after sometime as it will loose heat to the surroundings by conduction
  • Will rise for sometime and there after will start falling
  • Will become constant after sometime because of loss of heat due to radiation
Heat produced in a wire of resistance R due to current flowing at constant potential difference is proportional to

  • Physics-Current Electricity II-67027.png
  • 2)
    Physics-Current Electricity II-67028.png
  • R

  • Physics-Current Electricity II-67029.png
A coil takes 15 min to boil a certain amount of water, another coil takes 20 min for the same process. Time taken to boil the same amount of water when both coils are connected in series
  • 5 min
  • 8.6 min
  • 35 min
  • 30 min
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