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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 distances of stars more than 100 light years away.
    Reason Because parallax angle reduces so much that it cannot be measured accurately.

  • Question 3
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    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
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    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

    Assertion Mass, length and time are fundamental physical quantities.
    Reason They are independent of each other.

  • Question 6
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  • Question 7
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    Assertion Now a days a standard metre is defined in terms of the wavelength of light.
    Reason Light has no relation with length.

  • Question 8
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  • Question 9
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    Assertion Surface tension and surface energy have the same dimensions.
    Reason Because both have the same SI unit

  • Question 10
    4 / -1

    Assertion In y = A sin (ωt – kx), (ωt – kx) dimensionless.
    Reason Because dimension of ω = [M0L0T].

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