JEE Questions for Physics Current Electricity Ii Quiz 2 - MCQExams.com

Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,
  • B draws more current than A
  • currents drawn are in the ratio of their resistances
  • both draw the same current
  • A draws more current than B
A 5.0 A current is set up in an external circuit by a 6.0 V storage battery for 6.0 min. The chemical energy of the battery is reduced by
  • 1.08 × 104 J
  • 1.08 × 103 J
  • 1.8 × 104 J
  • 1.8 × 103 J
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 ?
  • 40 Ω
  • 20 Ω
  • 400 Ω
  • 200 Ω
Two bulbs X and Y having same voltage rating and of power 40 W and 60 W respectively are connected in series across a potential difference of 300 V, then
Physics-Current Electricity II-66349.png
  • X will glow brighter
  • resistance of Y. will be greater than X
  • heat produced in Y will be greater than X
  • voltage drop in X will be greater than Y
Two bulbs (25 W – 220 V) and (100 W – 220 V) are given. Which has higher resistance?
  • 25 W bulb
  • 100 W bulb
  • Both bulbs will have equal resistance
  • Resistance of bulbs cannot be compared
A coil takes 15 min to boil a certain amount of water, another coil takes 20 mm 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

Physics-Current Electricity II-66353.png
  • 200°C
  • 400°C
  • -200°C
  • -100°C
If a current is allowed to pass through a circuit consisting of two dissimilar metals, there is either evolution or absorption of heat at the junction, depending upon the direction of the current. The effect is known as
  • Seebeck effect
  • Joule effect
  • Peltier effect
  • Thomson effect
The thermo emf of a thermocouple is 25µV/°C at room temperature. A galvanometer of 40 Ω resistance capable of detecting current as low as 10-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is
  • 16° C
  • 12° C
  • 8° C
  • 20° C
If the cold junction of a thermocouple is kept at 0°C and the hot junction is kept at T°C, then the relation between neutral temperature (Tn) and temperature of inversion (Ti) is

  • Physics-Current Electricity II-66356.png
  • Tn = 2Ti
  • Tn = Ti - T
  • Tn = Ti + T
The thermocouple among the following that can produce maximum thermo emf for the same temperature difference between the junction is
  • Fe–Cu
  • Ag–Au
  • Sb–Bi
  • Cu–Pb
The thermo emf of a thermocouple varies with the temperature θ of the hot junction as E = aθ + bθ2 in volts where, the ratio a/ b is 700°C. If the cold junction is kept at 0°C, then the neutral temperature is
  • 700°C
  • 350°C
  • 1400°C
  • no neutral temperature is possible for this thermocouple
A thermocouple is made from two metals, antimony and bismuth. If one junction of the couple is kept hot and the other is kept cold, then an electric current will
  • flow from antimony to bismuth at the hot junction
  • flow from bismuth to antimony at the cold junction
  • not flow through the thermocouple
  • flow from antimony to bismuth at the cold junction

Physics-Current Electricity II-66359.png
  • 200°C, 2 mV
  • 400°C, 2 mV
  • 100°C, 1 mV
  • 200°C, 1 mV

Physics-Current Electricity II-66361.png

  • Physics-Current Electricity II-66362.png
  • 2)
    Physics-Current Electricity II-66363.png

  • Physics-Current Electricity II-66364.png

  • Physics-Current Electricity II-66365.png
If θi is the inversion temperature, θn is the neutral temperature, θc is the temperature of the cold junction, then
  • θi + θc = θn
  • θi – θc = 2θn

  • Physics-Current Electricity II-66367.png
  • θc – θi = 2θn
A silver and a copper voltameter are connected in series with a 12.0 V battery of negligible internal resistance. If 0.806 g of silver is deposited in half an hour, the terminal of copper deposited is
  • 0.625 g
  • 0.475 g
  • 0.525 g
  • 0.575 g
If 2 A of current is passed through CuSO4 solution for 32 s, then the number of copper ions deposited at the cathode will be
  • 4 × 1020
  • 2 × 1020
  • 4 × 1019
  • 2 × 1019
  • 1.6 × 1019
For obtaining chlorine by electrolysis a current of 100 kW and 125 V is used. (Electrochemical equivalent of chlorine is 0.367 × 10-6 kg C-1). The amount of chlorine obtained in one minute will be
  • 1.7616 g
  • 17.616 g
  • 0.17161 g
  • 1.7616 kg
x gram of Ag is deposited by passing 4 A of current for 1 h. How many gram of Ag will be deposited by passing 6 A for 40 min?
  • 4x gram
  • 2x gram
  • x gram
  • 5x gram
If 1 A current is passed through CuSO4 solution for 10 s, the number of copper atoms deposited at the cathode will be
  • 8 × 1019
  • 3.1 × 1019
  • 6.2 × 1019
  • 1.6 × 1020
When a Daniel cell is connected in the secondary circuit of a potentiometer, the balancing length is found to be 540 cm. If the balancing length becomes 500 cm when the cell is short circuited with 1Ω , the internal of the cell is
  • 0.08 Ω
  • 0.04 Ω
  • 1.0 Ω
  • 1.08 Ω
  • 1.45 Ω
A steady current of 1.5 A flows through a copper voltameter for 10 min. If the electrochemical equivalent of copper is 30 × 10-5 g C-1, the mass of copper deposited on the electrode will be
  • 0.40 g
  • 0.50 g
  • 0.67 g
  • 0.27 g
Two voltameters, one of copper and another of silver are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are Z1 and Z2 respectively, the charge which flows through the silver voltameter is

  • Physics-Current Electricity II-66376.png
  • 2)
    Physics-Current Electricity II-66377.png

  • Physics-Current Electricity II-66378.png

  • Physics-Current Electricity II-66379.png
In the method using the transformers, assume that the ratio of the number of turns in the primary to that in the secondary in the step-up transformer is 1:10. If the power to the consumers has to be supplied at 200 V, the ratio of the number of turns in the primary to that in the secondary in the step-down transformer is
  • 200 : 1
  • 150: 1
  • 100 : 1
  • 50 : 1
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100 W, 60 W and 40 W bulbs have filament resistances R100 , R60 and R40, respectively. The relation between these resistances is

  • Physics-Current Electricity II-66382.png
  • R100 = R40 + R60
  • R100 > R60 > R40

  • Physics-Current Electricity II-66383.png
B1 , B2 and B3 are the three identical bulbs connected to a battery of steady emf with key K closed. What happens to the brightness of the bulbs B1 and B2, when the key is opened?
Physics-Current Electricity II-66385.png
  • Brightness of the bulb B1 increases and that of B2 decreases
  • Brightness of the bulbs B1 and B2 increase
  • Brightness of the bulb B1 decreases and B2 increases
  • Brightness of the bulbs B1 and B2 decrease
Figure shows three resistor configurations R1 ,R2 and R3 connected to 3V battery. If the powers dissipated by the configurations R1 , R2 and R3 are P1 , P2 and P3 , respectively, then
Physics-Current Electricity II-66386.png
  • P1 > P2 > P3
  • P1 > P3 > P2
  • P2 > P1 > P3
  • P3 > P2 > P1
Two identical incandescent light bulbs are connected as shown in the figure. When the circuit is an AC voltage source of frequency f, which of the following observations will be correct?
Physics-Current Electricity II-66388.png
  • Both bulbs will glow alternatively
  • Both bulbs will glow with same brightness provided frequency,
    Physics-Current Electricity II-66389.png
  • Bulb b1 will light up initially and goes off, bulb b2 will be ON constantly
  • Bulb b1 will blink and bulb b2 will be ON constantly

Physics-Current Electricity II-66391.png

  • Physics-Current Electricity II-66392.png
  • 2)
    Physics-Current Electricity II-66393.png

  • Physics-Current Electricity II-66394.png

  • Physics-Current Electricity II-66395.png

Physics-Current Electricity II-66397.png

  • Physics-Current Electricity II-66398.png
  • 2)
    Physics-Current Electricity II-66399.png

  • Physics-Current Electricity II-66400.png

  • Physics-Current Electricity II-66401.png
For a certain thermocouple, if the temperature of the cold junction is 0°C, the neutral temperature and inversion temperature are 285°C and 570°C, respectively. If the cold junction is brought to 10°C, then the new neutral and inversion temperatures are respectively
  • 285°C and 560°C
  • 285°C and 570°C
  • 295°C and 560°C
  • 275°C and 560°C
Consider the following statements A and B and identify the correct answers given below:
Statement A Peltier coefficient is numerically equal to the potential difference across the junctions of the thermocouple through which current is flowing.
Statement B According to Thomson, energy is neither absorbed nor evolved at the junction of a thermocouple but is observed or evolved only along the lengths of both the conductors.
  • Both Statement A and Statement B are correct
  • Both Statement A and Statement B are incorrect
  • Statement A is correct but Statement B is incorrect
  • Statement A is incorrect but Statement B is correct
Two metallic wires of the same material and same length have different diameters. If we connect them in series across a battery the heat produced is H1. If we connect them in parallel to the same battery, the heat produced during the same time is H2. Then
  • H1 = H2
  • H1 > H2
  • H1 < H2
  • It will depend upon the voltage of battery
What will be the wattage of a 50 W, 200 V lamp when used on 160 V power supply?
  • 32 W
  • 64 W
  • 64 W
  • 128 W
What is the material for electric fuse?
  • Cu
  • Constantan
  • Tin-lead alloy
  • Nichrome
A constant potential difference is applied across the ends of a wire. Which one of the following operations will reduce the rate of heat generation to half?
  • Both length and diameter are halved
  • Both length and diameter are doubled
  • Diameter is doubled and length is halved
  • Diameter is halved and lengh is doubled
Two electric bulbs, one of 200 volt – 60 watt and the other of 200 volt – 200 watt are connected in a house wiring circuits,
  • they have equal currents through them
  • the resistance of the filaments in both the bulbs is same
  • the resistance of the filament in 60 watt bulb is more than the resistance in 200 watt bulb
  • the resistance of the filament in 200 watt bulb is more than the resistance in 60 watt bulb.
In the fig. all bulbs are identical. The bulb that lights most brilliantly is
Physics-Current Electricity II-66408.png
  • 1 only
  • 2 only
  • 2 and 4
  • 1 and 5
A, B, C in the Fig. are identical lamps. What changes occur in the brightness of the lamps when its switch S is closed?
Physics-Current Electricity II-66409.png
  • Brightness of A increases but that of B decreases
  • Brightness of A remains the same but that of B decreases
  • Brightness of both A and B decreases
  • Brightness of A increases but that of B remains the same
A current of 1.5 A flows through a wire for 30 minutes, when the potential difference across its ends is 10 V. The heat produced is

  • Physics-Current Electricity II-66410.png
  • 2)
    Physics-Current Electricity II-66411.png
  • 6342 cal

  • Physics-Current Electricity II-66412.png
The water in an electric kettle begins to boil in 15 minutes after being switched on. Using the same mains supply, should the length of the wire used as the heating element be increased or decreased if the water is to boil in 10 minutes?
  • increased by 10 %
  • decreased
  • increased by 50 %
  • unchanged
The three resistance A, B and C have values R, 3 R and 6 R respectively. When some Potential difference is applied across the net work, the thermal power dissipated by A, B and C are in the ratio
Physics-Current Electricity II-66413.png
  • 1 : 3 : 6
  • 3 : 1 : 31
  • 9 : 3 : 96
  • 3 : 9 : 96
Four resistances carrying a current shown in the circuit diagram Fig. are immersed in a box containing ice at 0ºC. How much ice must be put in the box every 10 minutes to keep the average quantity of ice in the box constant. (Latent heat of ice is 80 Cal/gm)
Physics-Current Electricity II-66415.png
  • 5 kg
  • 1.19 kg
  • 3 kg
  • 2.29 kg
Two identical batteries each of e.m.f. 2 V and internal resistance 1Ω are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is
  • 3.2 W
  • 2.0 W
  • 1.28 W
  • 8/9 W
Twenty electric bulbs are connected in series across a 220 V supply and the illumination produced is I1. Five bulbs are fused. If the remaining 15 bulbs are again connected in series, the illumination produced is I2. Then
  • I1 = I2
  • I1 > I2
  • I1 < I2
  • It will depend upon the resistance of each bulb.
Which of the following is not the advantage of alkali cells over acid cells?
  • Mechanical strong
  • Better life
  • Better operation
  • Higher e.m.f
If a current of 2 A liberates a certain amount of ions, a current of 8 A will liberate
  • six times
  • four times
  • sixteen times
  • eight times
A copper voltameter and a silver voltameter are connected in series in a circuit. The rate of the increase in the weight of the cathode in the two voltameters will be in the ratio of
  • atomic weights of Cu and Ag
  • densities of Cu and Ag
  • half of the atomic weight of Cu to the atomic weight of Ag
  • half of the atomic weight of Ag to half the atomic weight of Cu
A lead acid accumulator (storage battery) is connected to a battery charger for over night charging. Which of the following observations will indicate that the battery was partly charged during the next morning
  • the density of acid has decreased
  • the density of acid has increased
  • the acid has changed colour
  • the acid level has dropped
0:0:1


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