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WBJEE Physics and Measurement — practice questions

Explore 42 free Physics and Measurement questions in WBJEE Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Physics and Measurement questions and exercises with answers

Showing questions 1–30 of 42.

SI base unit of length:Read the answer and worked solution →Dimension of force:Read the answer and worked solution →Dimension of energy:Read the answer and worked solution →Dimensions of pressure:Read the answer and worked solution →Significant figures in 0.00302:Read the answer and worked solution →Dimension of universal gravitational constant G:Read the answer and worked solution →Dimension of Planck's constant h:Read the answer and worked solution →Dimension of electric field E:Read the answer and worked solution →Order of magnitude of 4567:Read the answer and worked solution →Relative error of measurement 5.00 ± 0.05 cm:Read the answer and worked solution →Dimensions of frequency:Read the answer and worked solution →Quantity having same dimensions as Planck's constant:Read the answer and worked solution →Avogadro number N_A is:Read the answer and worked solution →Dimensional formula of moment of inertia:Read the answer and worked solution →Error in product Q = A × B with relative errors a and b:Read the answer and worked solution →For Q = A²/B, fractional error:Read the answer and worked solution →Screw gauge: pitch 0.5 mm, 50 divisions on circular scale. Least count:Read the answer and worked solution →Mean of measurements: x̄. Standard error of mean for n trials:Read the answer and worked solution →Power consumed P = V²/R. If V measured to 2% and R to 1%, find error in P:Read the answer and worked solution →Significant figures in measurement 30.50:Read the answer and worked solution →In Young's modulus determination: Y = (FL)/(A ΔL). Maximum percentage error if F (force) 1%, L (length) 2%, A 3%, ΔL 4%:Read the answer and worked solution →Unit of viscosity in SI:Read the answer and worked solution →Conversion: 1 joule = ___ erg:Read the answer and worked solution →For Q = A + B with absolute errors a and b: error in Q:Read the answer and worked solution →Number of significant figures in 1.20 × 10⁻³ kg:Read the answer and worked solution →Dimensions of strain:Read the answer and worked solution →In SI, prefix 'tera' represents:Read the answer and worked solution →For relation v = u + at, dimensional consistency requires:Read the answer and worked solution →Dimensional formula of Stefan-Boltzmann constant σ (P = σAT⁴):Read the answer and worked solution →For the formula λ = h/p (de Broglie), dimensional consistency:Read the answer and worked solution →

Worked practice questions

SI base unit of length:

  1. meter
  2. yard
  3. centimeter
  4. inch
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Correct answer: A. meter

SI base units: meter (m) for length, kg for mass, s for time, ampere for current, kelvin for temperature, mole for amount, candela for luminous intensity.

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Dimension of force:

  1. M
  2. MLT⁻¹
  3. MLT
  4. MLT⁻²
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Correct answer: D. MLT⁻²

F = ma. [F] = [M][L][T⁻²] = MLT⁻². **Newton's first law:** F is mass × acceleration. SI: kg m s⁻² = newton.

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Dimension of energy:

  1. ML²T⁻²
  2. MLT⁻²
  3. Dimensionless
  4. MLT⁻¹
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Correct answer: A. ML²T⁻²

Energy = F × distance = MLT⁻² × L = ML²T⁻². SI: kg m² s⁻² = joule.

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