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Physics Test 181
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Physics Test 181
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  • Question 1/10
    4 / -1

    The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are

    Solutions

     

  • Question 2/10
    4 / -1

    The density of a material in CGS system of units is 4g∕cm3 In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be

    Solutions

     

  • Question 3/10
    4 / -1

    A student measures the distance traversed in free fall of a body, initially at rest, in a given time. He uses this data to estimate g, the acceleration due to gravity. If the maximum percentage errors in measurement of the distance and the time are e1 and e2 respectively, the percentage error in the estimation of g is

    Solutions

     

  • Question 4/10
    4 / -1

    If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be

    Solutions

    Error in the determination of the volume = 3×2% = 6%

     

  • Question 5/10
    4 / -1

    Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be

    Solutions

     

  • Question 6/10
    4 / -1

    The ratio of the distances travelled by a freely falling body in the 1st ,2nd ,3rd and 4th second

    Solutions

     

  • Question 7/10
    4 / -1

    The position-time (x–t) graph for positive acceleration is :

    Solutions

     

  • Question 8/10
    4 / -1

    A car starts from rest and accelerates at 5 m/s2. At t = 4 s, a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at t = 6 s?(Take g = 10 m/s2)

    Solutions

    Initial velocity of car = 0

    Acceleration of car = 5 m/s2

    Velocity of car at t = 4 s; v = u + at

    ⇒ v = 0 + 5 × 4 = 20 ms–1At t = 4 s, A ball is dropped out of a window so velocity of ball at this instant is 20 ms–1 along horizontal.

    After 2 seconds of motion :

    Horizontal velocity of ball = 20ms−1(∵ ax = 0)

    Vertical velocity of ball (vy) = uy + ayt

    vy = 0 + 10 × 2 = 20ms−1 (∵ ay = g = 10m∕s2)

    So magnitude of velocity of ball

    Acceleration of ball at t = 6s is g = 10m∕s2

    As ball is under free fall.

     

  • Question 9/10
    4 / -1

    Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t1. On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time t2. The time taken by her to walk up on the moving escalator will be

    Solutions

    Let v1 is the velocity of preeti on stationary escalator and d is the distance travelled by her

     

  • Question 10/10
    4 / -1

    Two cars P and Q start from a point at the same time in a straight line and their positions are represented by xp(t) = (at + bt2) and xQ(t) = (ft − t2). At what time do the cars have the same velocity?

    Solutions

     

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