JEE Questions for Physics Current Electricity Ii Quiz 9 - MCQExams.com

If a 2 kW boiler is used everyday for 1 hour, then electrical energy consumed by boiler in thirty days is
  • 15 unit
  • 60 unit
  • 120 unit
  • 240 unit
Some electric bulbs are connected in series across a 220 V supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room will
  • Increase
  • Decrease
  • Remain the same
  • Not be continuous
B1, B2 and B3 are the three identical bulbs connected to a battery of steady e. m. f. with key K closed. What happens to the brightness of the bulbs B1 and B2 when the key is opened
Physics-Current Electricity II-67101.png
  • Brightness of the bulb B1 increases and that of B2 decreases
  • Brightness of the bulbs B1 and B2 increases
  • Brightness of the bulb B1 decreases and that of B2 increases
  • Brightness of the bulbs B1 and B2 decreases
An electric heater is heated respectively by D.C. and A.C. Applied voltage for both the currents is equal. The heat produced per second will be
  • More on heating by A.C. source
  • More on heating by D.C. source
  • Same for both
  • None of the above
Same current is being passed through a copper voltmeter and a silver voltmeter. The rate of increase in weights of the cathode of the two voltmeters will be proportional to
  • Atomic masses
  • Atomic number
  • Relative densities
  • None of the above
A lead-acid battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.5 ohm, the maximum current that can be drawn from the battery will be
  • 30 A
  • 20 A
  • 6 A
  • 24 A
The electrolyte used in Lechlanche cell is
  • Copper sulphate solution
  • Ammonium chloride solution
  • Dilute sulphuric acid
  • Zinc sulphate
To deposit one litre of hydrogen at 22.4 atmosphere from cidulated water, the quantity of electricity that must pass through is
  • 1 coulomb
  • 22.4 coulomb
  • 96500 coulomb
  • 193000 coulomb
Ampere hour is the unit of
  • Quantity of charge
  • Potential
  • Energy
  • Current
For goldplating on a copper chain, the substance required in the form of solution is
  • Copper sulphate
  • Copper chloride
  • Potassium cyanide
  • Potassium aurocyanide
On passing the current in water voltameter, hydrogen
  • Is liberated at anode
  • Is liberated at cathode
  • Is not liberated
  • Remains in the solution
In water voltameter, the electrolysis of ... takes place
  • H2O
  • H2SO4
  • H2O and H2SO4 both
  • H2 and O2
The chemical equivalent of copper and zinc are 32 and 108 respectively. When copper and silver voltameters are connected in series and electric current is passed through for sometime, 1.6 g of copper is deposited. Then, the mass of silver deposited will be
  • 3.5 g
  • 2.8 g
  • 5.4 g
  • None of these
A battery of e.m.f. 3 volt and internal resistance 1.0 ohm is connected in series with copper voltameter. The current flowing in the circuit is 1.5 amperes. The resistance of voltameter will be
  • Zero
  • 1.0 ohm
  • 1.5 ohm
  • 2.0 ohm
According to Faraday\'s laws of electrolysis, the amount of decomposition is proportional to

  • Physics-Current Electricity II-67109.png
  • Electrochemical equivalent of the substance

  • Physics-Current Electricity II-67110.png

  • Physics-Current Electricity II-67111.png
If in a voltaic cell 5 gm of zinc is consumed, then we get how many ampere hours? (Given that E.C.E. of Zn is 3.387 × 10–7 kg/coulomb)
  • 2.05
  • 8.2
  • 4.1
  • 5 × 3.387 × 10–7
The current flowing in a copper voltameter is 1.6 A. The number of Cu++ ions deposited at the cathode per minute are
  • 1.5 × 1020
  • 3 × 1020
  • 6 × 1020
  • 1 × 1019
In a copper voltameter experiment, current is decreased to one-fourth of the initial value but is passed for four times the earlier duration. Amount of copper deposited will be
  • Same
  • One-fourth the previous value
  • Four time the previous value
  • 1/6 th of the previous value
A certain charge liberates 0.8 gm of O2. The same charge will liberate how many gm of silver?
  • 108 gm
  • 10.8 gm
  • 0.8 gm

  • Physics-Current Electricity II-67115.png
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 voltammeter is

  • Physics-Current Electricity II-67117.png
  • 2)
    Physics-Current Electricity II-67118.png

  • Physics-Current Electricity II-67119.png

  • Physics-Current Electricity II-67120.png
The atomic weight of silver and copper are 108 and 64. A silver voltameter and a copper voltameter are connected in series and when current is passed 10.8 gm of silver is deposited. The mass of copper deposited will be
  • 6.4 gm
  • 12.8 gm
  • 3.2 gm
  • 10.8 gm
Faraday\'s laws of electrolysis are related to
  • The atomic number of positive ion
  • The equivalent weight of electrolyte
  • The atomic number of negative ion
  • The velocity of positive ion
In the process of electrolysis, the current is carried out inside the electrolyte by
  • Electrons
  • Atoms
  • Positive and negative ions
  • All of the above
The amount of charge required to liberate 9 gm of aluminium (atomic weight = 27 and valency =in the process of electrolysis is (Faraday\'s number = 96500 coulombs/gm equivalent)
  • 321660 coulombs
  • 69500 coulombs
  • 289500 coulombs
  • 96500 coulombs
In an electroplating experiment, m gm of silver is deposited when 4 ampere of current flows for 2 minute. The amount (in gm) of silver deposited by 6 ampere of current for 40 second will be
  • 4 m
  • m/2
  • m/4
  • 2 m
A current of 16 ampere flows through molten NaCl for 10 minute. The amount of metallic sodium that appears at the negative electrode would be
  • 0.23 gm
  • 1.15 gm
  • 2.3 gm
  • 11.5 gm
The mass of a substance liberated when a charge ‘q’ flows through an electrolyte is proportional to
  • q
  • 1/q
  • q2
  • 1/q2
A steady current of 5 amps is maintained for 45 mins. During this time it deposits 4.572 gm of zinc at the cathode of a voltameter. E.C.E. of zinc is
  • 3.387 × 10–4 gm/C
  • 3.387 × 10–4 C/gm
  • 3.384 × 10–3 gm/C
  • 3.394 × 10–3 C/gm
The relation between Faraday constant F, electron charge e and avogadro number N is
  • F = N/e
  • F = Ne
  • N = F2
  • F = N2e
Two electrolytic cells containing CuSO4 do AgNO3 respectively are connected in series and a current is passed through them until 1mg of copper is deposited in the first cell. The amount of silver deposited in the second cell during this time is approximately
[Atomic weights of copper and silver are respectively 63.57 and 107.88]
  • 1.7 mg
  • 3.4 mg
  • 5.1 mg
  • 6.8 mg
A current I is passed for a time t through a number of voltameters. If m is the mass of a substance deposited on an electrode and z is its electrochemical equivalent, then

  • Physics-Current Electricity II-67129.png
  • 2)
    Physics-Current Electricity II-67130.png

  • Physics-Current Electricity II-67131.png

  • Physics-Current Electricity II-67132.png
For electroplating a spoon, it is placed in the vlotameter at
  • The position of anode
  • The position of cathode
  • Exactly in the middle of anode and the cathode
  • Anywhere in the electrolyte
If nearly 105 coulomb liberate 1 gm equivalent of aluminium, then the amount of aluminium (equivalent weightdeposited through electrolysis in 20 minutes by a current of 50 amp will be
  • 0.6 gm
  • 0.09 gm
  • 5.4 gm
  • 10.8 gm
Electroplating does not help in
  • Fine finish to the surface
  • Shining appearance
  • Metals to become hard
  • Protecting metal against corrosion
When a current is passed through water, acidified with a dilute sulphuric acid, the gases formed at the platinum electrodes are
  • 1 vol. hydrogen (cathode) and 2 vol. oxygen (anode)
  • 2 vol. hydrogen (cathode) and 1 vol. oxygen (anode)
  • 1 vol. hydrogen (cathode) and 1 vol. oxygen (anode)
  • 1 vol. oxygen (cathode) and 2 vol. hydrogen (anode)
The negative Zn pole of a Daniel cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is
  • 0.242 g
  • 0.190 g
  • 0.141 g
  • 0.126 g
A copper voltameter is connected in series with a heater coil of resistance 0.1 S2. A steady current flows in the circuit for twenty minutes and mass of 0.99g of copper is deposited at the cathode. If electrochemical equivalent of copper is 0.00033 gm/C, then heat generated in the coil is
  • 750 J
  • 650 J
  • 350 J
  • 250 J
The value of current required to deposit 0.972 gm of chromium in 3 hours if the E.C.E. of chromium is 0.00018 gm per coulomb, is
  • 1 amp
  • 1.5 amp
  • 0.5 amp
  • 2 amp
The current inside a copper voltameter
  • Is half the outside value
  • Is the same as the outside value
  • Is twice the outside value
  • Depends on the concentration of CuSO4
The resistance of a cell does not depend on
  • Current drawn from the cell
  • Temperature of electrolyte
  • Concentration of electrolyte
  • The e.m.f. of the cell
The electrochemical equivalent of a metal is 3.3 × 10–7 kg/coulomb. The mass of the metal liberated at the cathode when a 3 A current is passed for 2 seconds will be
  • 19.8 × 10–7 kg
  • 9.39 × 10–7 kg
  • 6.6 × 10–7 kg
  • 1.1 × 10–7 kg
Faraday\'s 2nd law states that mass deposited on the electrode is directly proportional to
  • Atomic mass
  • Atomic mass × Velocity
  • Atomic mass/Valency
  • Valency
The electrochemical equivalent of a material in an electrolyte depends on
  • The nature of the material
  • The current through the electrolyte
  • The amount of charge passed through electrolyte
  • The amount of material present in electrolyte
If 96500 coulombs of electricity liberates one gram equivalent of any substance, the time taken for a current of 0.15 amperes to deposit 20 mg of copper from a solution of copper sulphate is (Chemical equivalent of copper = 32)
  • 5 min 20 sec
  • 6 min 42 sec
  • 4 min 40 sec
  • 5 min 50 sec
How much current should be passed through acidified water for 100 s to liberate 0.224 litre of H2
  • 22.4 A
  • 19.3 A
  • 9.65 A
  • 1 A
Who among the following scientists made the statement- \ Chemical change can produce electricity\
  • Galvani
  • Faraday
  • Coulomb
  • Thomson
The current flowing in a copper voltameter is 3.2 A. The number of copper ions (Cu2+ ) deposited at the cathode per minute is
  • 0.5 × 1020
  • 1.5 × 1020
  • 3 × 1020
  • 6 × 1020
A copper and a chromium voltameter are connected in series with a battery. It found that in half an hour 0.475 g of copper and 0.130 g of chromium have been deposited. The ECE ratio of copper and chromium is
  • 0.274
  • 0.523
  • 3.65
  • 1.85
When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
  • Joule effect
  • Seebeck effect
  • Peltier effect
  • Thomson effect
When a current passes through a wire whose different parts are maintained at different temperatures, evolution or absorption of heat all along the length of wire is known as
  • Joule effect
  • Seebeck effect
  • Peltier effect
  • Thomson effect
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