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    1.

    A copper wire of cross-sectional area 1imes10βˆ’6m21 imes 10^{-6} m^2 carries a current of 1 A. Assuming that each copper atom contributes one free electron, calculate the drift velocity of the electrons. Given: density of copper = 9imes103kg/m39 imes 10^3 kg/m^3, atomic weight of copper = 63.5 g/mol, Avogadro's number = 6.02imes1023molβˆ’16.02 imes 10^{23} mol^{-1}.

    A

    0.01 mm/s

    B

    0.1 mm/s

    C

    1 mm/s

    D

    10 mm/s

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :electric current, drift velocity, number density
    2.

    In a certain region of space there are only 5 molecules per cm2{\rm{c}}{{\rm{m}}^2} on an average. The temperature there is 3 K. The pressure of this dilute gas is (k=1.38imes10βˆ’23β€…β€ŠJKβˆ’1)k = 1.38 imes {10^{ - 23}}\;{\rm{J}}{{\rm{K}}^{ - 1}}))

    A

    2.07 x 10⁻¹⁢ Pa

    B

    2.07 x 10⁻²² Pa

    C

    2.07 x 10⁻¹⁰ Pa

    D

    2.07 x 10⁻²⁰ Pa

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Kinetic Theory of Gases
    🎯Topic:Pressure And Kinetic Interpretation Of Temperature
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Ideal Gas Law, Pressure, Boltzmann constant, Number Density
    3.

    In a certain region of space there are only 5 molecules per cm2{\rm{c}}{{\rm{m}}^2} on an average. The temperature there is 3 K. The pressure of this dilute gas is (k=1.38imes10βˆ’23β€…β€ŠJKβˆ’1)k = 1.38 imes {10^{ - 23}}\;{\rm{J}}{{\rm{K}}^{ - 1}}))

    A

    2.07 x 10⁻¹⁸ Pa

    B

    2.07 x 10⁻²² Pa

    C

    6.9 x 10⁻¹⁹ Pa

    D

    6.9 x 10⁻²³ Pa

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Kinetic Theory of Gases
    🎯Topic:Pressure And Kinetic Interpretation Of Temperature
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Ideal Gas Law, Pressure, Boltzmann Constant, Number Density
    4.

    In a certain region of space there are only 5 molecules per cm2{\rm{c}}{{\rm{m}}^2} on an average. The temperature there is 3 K. The pressure of this dilute gas is (k=1.38imes10βˆ’23β€…β€ŠJKβˆ’1)k = 1.38 imes {10^{ - 23}}\;{\rm{J}}{{\rm{K}}^{ - 1}}))

    A

    2.07 x 10^-18 Pa

    B

    2.07 x 10^-16 Pa

    C

    2.07 x 10^-20 Pa

    D

    2.07 x 10^-17 Pa

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Kinetic Theory of Gases
    🎯Topic:Pressure And Kinetic Interpretation Of Temperature
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Ideal Gas Law, Pressure, Number Density
    5.

    Current is flowing with a current density J=480  A cmβˆ’2J = 480\,\,{\rm{A}}\,{\rm{c}}{{\rm{m}}^{ - 2}} in a copper wire. Assuming that each copper atom contributes one free electron and given that Avogadro number =6.0  imes  1023  atoms  molβˆ’1 = 6.0\,\, imes \,\,{10^{23}}\,\,{\rm{atoms}}\,\,{\rm{mo}}{{\rm{l}}^{ - 1}}

    Density of copper=  9.0 g  cmβˆ’3 = \,\,9.0\,{\rm{g}}\,\,{\rm{c}}{{\rm{m}}^{ - 3}}

    Atomic weight of copper = 64 g  molβˆ’1{\rm{ = }}\,{\rm{64}}\,{\rm{g}}\,\,{\rm{mo}}{{\rm{l}}^{ - 1}}

    The drift velocity of electrons is

    A

    1  mm  sβˆ’11\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    B

    2  mm  sβˆ’12\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    C

    0.5  mm  sβˆ’10.5\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    D

    0.36  mm  sβˆ’10.36\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :current density, drift velocity, number density, Avogadro's number
    6.

    Current is flowing with a current density J=480  A cmβˆ’2J = 480\,\,{\rm{A}}\,{\rm{c}}{{\rm{m}}^{ - 2}} in a copper wire. Assuming that each copper atom contributes one free electron and given that Avogadro number =6.0  imes  1023  atoms  molβˆ’1 = 6.0\,\, imes \,\,{10^{23}}\,\,{\rm{atoms}}\,\,{\rm{mo}}{{\rm{l}}^{ - 1}}

    Density of copper=  9.0 g  cmβˆ’3 = \,\,9.0\,{\rm{g}}\,\,{\rm{c}}{{\rm{m}}^{ - 3}}

    Atomic weight of copper = 64 g  molβˆ’1{\rm{ = }}\,{\rm{64}}\,{\rm{g}}\,\,{\rm{mo}}{{\rm{l}}^{ - 1}}

    The drift velocity of electrons is

    A

    1  mm  sβˆ’11\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    B

    2  mm  sβˆ’12\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    C

    0.5  mm  sβˆ’10.5\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    D

    0.36  mm  sβˆ’10.36\,\,{\rm{mm}}\,\,{{\rm{s}}^{ - 1}}

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :current density, drift velocity, number density, Avogadro number, atomic weight, density
    7.

    The number of free electrons per 100  mm{\rm{100}}\,\,{\rm{mm}} of ordinary copper wire is 2  imes  10212\,\, imes \,\,{10^{21}}. Average drift speed of electrons is 0.25  msβˆ’10.25\,\,{\rm{m}}{{\rm{s}}^{ - 1}}. The current flowing is

    A

    8  A{{\rm{8}}\,\,{\rm{A}}}

    B

    0.8  A{\rm{0}}{\rm{.8}}\,\,{\rm{A}}

    C

    80  A{{\rm{80}}\,\,{\rm{A}}}

    D

    5  A{{\rm{5}}\,\,{\rm{A}}}

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :Electric Current, Drift Velocity, Number Density of Electrons, Charge of an Electron
    8.

    A wire of diameter 0.02  metre0.02\,\,metre contains 1028{10^{28}} free electrons per cubic metre. For an electrical current of 100  A100\,\,A, the drift velocity of the free electrons in the wire is nearly

    A

    1  imes  10βˆ’19  m/s1\,\, imes \,\,{10^{ - 19}}\,\,m/s

    B

    5  imes  10βˆ’10  m/s5\,\, imes \,\,{10^{ - 10}}\,\,m/s

    C

    2  imes  10βˆ’4  m/s2\,\, imes \,\,{10^{ - 4}}\,\,m/s

    D

    8  imes  103  m/s8\,\, imes \,\,{10^3}\,\,m/s

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Current, Drift velocity, Number density of electrons, Area of cross section
    9.

    There is a current of 1.344  amp1.344\,\,amp in a copper wire whose area of cross-section normal to the length of the wire is 1  mm21\,\,m{m^2}. If the number of free electrons per cm3c{m^3} is 8.4  imes  10228.4\,\, imes \,\,{10^{22}}, then the drift velocity would be

    A

    1.0  mm/sec⁑1.0\,\,mm/\sec

    B

    1.0  m/sec⁑1.0\,\,m/\sec

    C

    0.1  mm/sec⁑0.1\,\,mm/\sec

    D

    0.01  mm/sec⁑0.01\,\,mm/\sec

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Electric Current, Drift Velocity, Charge of an Electron, Number Density
    10.

    Assume that each atom of copper contributes one free electron. What is the average drift velocity of conduction electrons in a copper wire of cross-sectional area 10βˆ’7  m2{10^{ - 7}}\,\,{{\rm{m}}^2}, carrying a current of 1.5 A{\rm{1}}{\rm{.5}}\,{\rm{ A}} ? (Given density of copper 9  imes  10βˆ’3  kgmβˆ’39\,\, imes \,\,{10^{ - 3}}\,\,{\rm{kg}}{{\rm{m}}^{ - 3}}; atomic mass of copper = 63.5{\rm{ = }}\,{\rm{63}}{\rm{.5}}; Avogadro’s number =6.023  imes  1023 = 6.023\,\, imes \,\,{10^{23}} per gram atom)

    A

    1.1  imes  10βˆ’2  msβˆ’11.1\,\, imes \,\,{10^{ - 2}}\,\,{\rm{m}}{{\rm{s}}^{ - 1}}

    B

    1.1  imes  10βˆ’3  msβˆ’11.1\,\, imes \,\,{10^{ - 3}}\,\,{\rm{m}}{{\rm{s}}^{ - 1}}

    C

    2.2  imes  10βˆ’2  msβˆ’12.2\,\, imes \,\,{10^{ - 2}}\,\,{\rm{m}}{{\rm{s}}^{ - 1}}

    D

    2.2  imes  10βˆ’3  msβˆ’12.2\,\, imes \,\,{10^{ - 3}}\,\,{\rm{m}}{{\rm{s}}^{ - 1}}

    Question Tags

    πŸ“š Subject:Physics
    πŸ“‘ Chapter:Current Electricity
    🎯Topic:Electric Current And Drift Velocity
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Medium
    ⚑ Time Required :3 mins
    πŸ”„Ncert Concepts :Drift velocity, Current, Number density, Atomic mass, Avogadro's number

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