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Units and Measurements Test - 4

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Units and Measurements Test - 4
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Significant figures depend on ________ number of significant figures in given data.

    Solution

    Significant figures depend only on least number of significant figures in given data.

     

  • Question 2
    1 / -0

    A dimensionless quantity

    Solution

    A dimensionless quantity might have a unit. For example, an angle has unit radians.

     

  • Question 3
    1 / -0

    Dimensions cannot be used to

    Solution

    The value of constants cannot be found. It is only possible to derive a relation involving the constants.

     

  • Question 4
    1 / -0

    Approximate ratio of 1 fermi to 1 angstrom is ..............

    Solution

    1 fermi = 10-15 m, 1angstrom = 10-10 m

    Hence,1 fermi / 1angstrom  = 10-15/ 10-10 = 10-5 m

     

  • Question 5
    1 / -0

    Which of the following physical quantities has different dimensions?

    Solution

    Momentum = Mass x Velocity = [M L T-1]

     

  • Question 6
    1 / -0

    Find the odd one out.

    Solution

    Length, mass, and time are the base quantities where as weight is a derived quantity.

     

  • Question 7
    1 / -0

    The position of pen seems to be changed when you look at it through your left and right eye w.r.t to a fixed point on a wall. This effect is called ________ .

    Solution

    Parallax effect arises due to the distance between our eyes.

     

  • Question 8
    1 / -0

    Three physical quantity having dimensions [M L-1 T-2] are

    Solution

    Pressure = Force/Area = ML1T-2/ L2 = [M L-1 T-2]

    Stress = Force/Area = ML1T-2/ L2 = [M L-1 T-2]

    Coefficient of elasticity = Stress/strain = [M L-1 T-2]

     

  • Question 9
    1 / -0

    The number of significant figures in the distance of one light year , 9.4605 × 1015 m is

    Solution

    As the power of 10 is irrelevant in the determination of significant figures hence, the numbers of significant figures are 5.

     

  • Question 10
    1 / -0

    Which unit system is presently internationally accepted?

    Solution

    International system of unit- SI is presently internationally accepted for measuring physical quantity.

     

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