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Physics Test 119

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Physics Test 119
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Given that  where t represents time in second and x represents distance in metre. Which of the following statements is true ?

  • Question 2
    4 / -1

    The error in two readings of A are 0.01 and -0.03, then mean absolute error is ?

    Solution

    Absolute mean error = (a1-a2)/2

    [0.01-(-0.03)]/2

    = 0.04/2 

    = 0.02.

     

  • Question 3
    4 / -1

    The angle between vectors 

  • Question 4
    4 / -1

    The sum, difference and cross product of two vectors  are mutually perpendicular if

  • Question 5
    4 / -1

    A boy is running over a circular track with uniform speed of 10 m/s. Find the average velocity for movement of boy from A to B. (in m/s)

  • Question 6
    4 / -1

    A ball rolls from the top of a stair way with a horizontal velocity u m/s. If the steps are h metre high and b metre wide, the ball will hit edge of the nth step, if

    Solution

    Horizontal distance covered by ball =nb

    Vertical distance covered by ball =nh

    If the time taken to hit the edge of nth step is t, then

    nb = ut

    nh = 12gt^2

    Eliminating t, we get,

    nh = 1/2g (nb/u)^2

    n = 2hu^2/gb^2

     

  • Question 7
    4 / -1

    Which of the following is the altitude-time graph for a projectile thrown horizontally from the top of the tower?

  • Question 8
    4 / -1

    Two blocks are connected over a massless pulley as shown in figure. The mass of block A is 10 kg and the coefficient of kinetic friction is 0.2. Block A slides down the incline at constant speed. The mass of block B in kg is

  • Question 9
    4 / -1

    Two masses m and M are attached with strings as shown. For the system to be in equilibrium we have

  • Question 10
    4 / -1

    A long spring is stretched by 2 cm. Its potential energy is U. If the spring is streched by 10 cm, its potential energy would be

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