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Which of the following measurements is most
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The mean length of an object is 5 cm. Which of the following measurements is most
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Young’s modulus of steel is 1.9 × 1011 N/m 2 . When expressed in CGS units of dynes/cm 2, it will be equal to (1N = 105 dyne, 1 m 2 = 104 cm 2
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If momentum (P ), area (A) and time (T ) are taken to be fundamental quantities, then energy has the dimensional
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On the basis of dimensions, decide which of the following relations for the displacement of a particle undergoing simple harmonic motion is not
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If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful
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Photon is quantum of radiation with energy E = hν where ν is frequency and h is Planck’s constant. The dimensions of h are the same as that
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If Planck’s constant (h ) and speed of light in vacuum (c ) are taken as two fundamental quantities, which one of the following can, in addition, be taken to express length, mass and time in terms of the three chosen fundamental
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Which of the following ratios express
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Which of the following are not a unit of
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Why do we have different units for the same physical
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The radius of atom is of the order of 1 Å and radius of nucleus is of the order of fermi. How many magnitudes higher is the volume of atom as compared to the volume of
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Name the device used for measuring the mass of atoms and
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Express unified atomic mass unit in
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A function f (θ ) is defined as: `f(θ)=1- θ+θ^2/(2!)-θ^3/(3!)+θ^4/(4!)........` Why is it necessary for q to be a dimensionless
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Why length, mass and time are chosen as base quantities in
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The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the
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Moon is seen to be of `(1⁄2)^°` diameter from the earth. What must be the relative size compared to the
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From parallax measurement, the sun is found to be at a distance of about 400 times the earth-moon distance. Estimate the ratio of sun-earth
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Which of the following time measuring devices is most precise? A wall
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