1.

    A chemist measures a reaction rate as 2.5imes10−32.5 imes 10^{-3} mol L−1^{-1} s−1s^{-1}. Express this rate in molecules cm−3cm^{-3} μs−1\mu s^{-1} (molecules per cubic centimeter per microsecond). Avogadro's number = 6.022imes10236.022 imes 10^{23} molecules/mol.

    A

    1.5imes10121.5 imes 10^{12} molecules cm−3cm^{-3} μs−1\mu s^{-1}

    B

    2.5imes10182.5 imes 10^{18} molecules cm−3cm^{-3} μs−1\mu s^{-1}

    C

    1.5imes10151.5 imes 10^{15} molecules cm−3cm^{-3} μs−1\mu s^{-1}

    D

    4.2imes10204.2 imes 10^{20} molecules cm−3cm^{-3} μs−1\mu s^{-1}

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :3 mins
    🔄Ncert Concepts :Unit Conversion, Reaction Rate, Avogadro's Number

    Related Questions

    1.

    A solution has a concentration of 20 g/L. Express this concentration in mg/mL.

    A

    0.02 mg/mL

    B

    2 mg/mL

    C

    20 mg/mL

    D

    200 mg/mL

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :unit conversion, concentration

    2.

    Convert 5000 mL to liters.

    A

    0.5 L

    B

    5 L

    C

    50 L

    D

    500 L

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Unit Conversion, Volume

    3.

    Dimensions of strain are

    A

    MLT−1ML{T^{ - 1}}

    B

    ML2T−1M{L^2}{T^{ - 1}}

    C

    MLT−2ML{T^{ - 2}}

    D

    M0L0T0{M^0}{L^0}{T^0}

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Strain, Dimensional Analysis

    4.

    Dimensional formula of heat energy is

    A

    ML2T−2M{L^2}{T^{ - 2}}

    B

    MLT−1ML{T^{ - 1}}

    C

    M0L0T−2{M^0}{L^0}{T^{ - 2}}

    D

    None of these

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Dimensional Analysis, Heat Energy

    5.

    Dimensional formula of heat energy is

    A

    [MLT⁻²]

    B

    [ML²T⁻²]

    C

    [MLT⁻¹]

    D

    [ML²T⁻³]

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Dimensional analysis, Heat energy

    6.

    Energy per unit volume represents

    A

    Pressure

    B

    Force

    C

    Thrust

    D

    Work

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Pressure, Energy Density

    7.

    A force of 5 dyne is applied on a body. Express this force in Newtons.

    A

    5 x 10^5 N

    B

    5 x 10^-5 N

    C

    5 N

    D

    0.5 N

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :unit conversion, force

    8.

    A car travels at a speed of 60 km/h. What is its speed in m/s?

    A

    1.67 m/s

    B

    16.67 m/s

    C

    166.7 m/s

    D

    0.167 m/s

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :unit conversion, speed

    9.

    100 cm is equivalent to how many kilometers?

    A

    0.01 km

    B

    0.1 km

    C

    1 km

    D

    0.001 km

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Unit Conversion, Length

    10.

    The wavelength of a light wave is 500 nm. Express this wavelength in meters.

    A

    5 x 10^-9 m

    B

    5 x 10^-7 m

    C

    5 x 10^7 m

    D

    5 x 10^9 m

    Question Tags
    📚 Subject:Physics
    📑 Chapter:Units And Measurement
    🎯Topic:Conversion Of Units For One System To Another
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :unit conversion, wavelength, scientific notation

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