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Physics Test 87

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Physics Test 87
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A uniform rod of negligible mass is hanging in a horizontal position with the help of two threads. It also supports of 40 kg mass as shown in the figure. Find tension developed in each thread.

    Solution

     

  • Question 2
    4 / -1

    Which of the following statement is incorrect about moment of inertia :

    Solution

    I ∝ mr2

     

  • Question 3
    4 / -1

    A solid sphere and solid cylinder of same radius are rolling purely on an inclined plane. Then the ratio of their acceleration is :

    Solution

     

  • Question 4
    4 / -1

    If the moment of inertia of a disc about an axis tangential and parallel to its surface be 3I, then what will be the moment of inertia about an axis tangential but perpendicular to the surface?

    Solution

     

  • Question 5
    4 / -1

    A hollow sphere is performing pure rolling then find acceleration of its centre of mass:

    Solution

     

  • Question 6
    4 / -1

    If the output of an AC generator is E = 170 sin 377 t; then frequency will be

    Solution

    V = V0 sin ωt

    ω = 2πf = 377

    f = 60 Hz

     

  • Question 7
    4 / -1

    The frequency of an alternating current is 50 Hz, then the time difference corresponding to phase angle of 50°, is

    Solution

     

  • Question 8
    4 / -1

    AC can't be measured by DC ammeter because

  • Question 9
    4 / -1

    The voltage of AC source varies with time according to the equation V = 240 sin 100 πt cos 100 πt, where t is in sec

    Solution

    V = 240 sin 100 πt cos 100 πt
    V = 120 sin 200 πt

    ⇒ V0 = 120 V, f = 100 Hz

     

  • Question 10
    4 / -1

    If the rms value of AC is irms then its peak value is

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