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Units and Measu...

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  • Question 1
    4 / -1

  • Question 2
    4 / -1

    Assertion: Parallax method cannot be used for measuring distance of stars more than 100 light years away.
    Reason: Because parallax angle reduces so much that it cannot be measured accurately

  • Question 3
    4 / -1

    Assertion: The graph between P and Q is straight line, when P/Q is constant.
    Reason: The straight line graph means that P proportional to Q or P is equal to constant multiplied by Q.

  • Question 4
    4 / -1

    Assertion: Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.
    Reason: In every measurement, only the last significant digit is not accurately known.

  • Question 5
    4 / -1

  • Question 6
    4 / -1

    Assertion: Now a days a standard metre is defined in terms of wavelength of light.
    Reason: Light has no relation with length.

  • Question 7
    4 / -1

  • Question 8
    4 / -1

    Assertion: Surface tension and surface energy have the same dimensions.
    Reason: Because both have the same S.I unit

  • Question 9
    4 / -1

  • Question 10
    4 / -1

    Assertion: Dimensional constants are the quantities whose values are constant.
    Reason: Dimensional constants are dimensionless.

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