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Physics Test 59

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Physics Test 59
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  • Question 1
    4 / -1

    A tube of length L is completely filled with an incompressible liquid of mass M and closed at both ends. The tube is rotated in a horizontal plane at one of its ends with uniform angular speed ''. What is the force exerted by the liquid at the other end is?

    Solution

    Let the length of a small element of tube be dx

    Mass of this element-

    dm = M/L dx

    Where M is mass of filled liquid and Lis length of tube.

    Force on this element,

    Hence, the correct option is (A).

     

  • Question 2
    4 / -1

    A stationary body of mass 3 kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of  and the other with a veloctiy of  If the explosion takes place in 10−5s, the average force actingon the third piece in newtons is

    Solution

     

  • Question 3
    4 / -1

    A person travels along a straight road for the first half time with a velocity v1 and for the second half time with a velocity v2. The mean velocity ′V′ is given by

    Solution

     

  • Question 4
    4 / -1

    A train approaches a stationary observer, the velocity of train being 1/20 of the velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of a sec. The interval between the successive blasts as heard by the observer is

    Solution

    From Dopplers effect in sound the apparent change in frequency of the source due to a relative motion between source and observer is

    n = n (v−vo / v−vs)

    Given that,

    vo=0, v= v/ 20 n=1 Hz (as blast is blown at an interval of 1 s)

    ∴ n = v / v−v/20 × 1 =  20/19 Hz Observed time interval between two successive blasts =19 / 20sec.

    Hence, the correct option is (C).

     

     

  • Question 5
    4 / -1

    A block released on a rough inclined plane of inclination =30 slides down the plane with an acceleration g/4, where, g is the acceleration due to gravity. What is the coefficient of friction between the block and the inclined plane?

    Solution

     

     

  • Question 6
    4 / -1

    Two masses m1 and m2 are suspended together by a mass-less spring of spring constant K. When the masses are in equilibrium, m1 is removed without disturbing the system. The angular frequency and amplitude of oscillation of m2 are

    Solution

     

     

  • Question 7
    4 / -1

    Two small charged spheres A and B have charges 10µC and 940µC, respectively, and are held at a separation of 90 cm from each other. At what distance from A would the electric intensity be zero?

    Solution

     

     

  • Question 8
    4 / -1

    A source emitting wavelengths 480 nm and 600 nm is used in Young's Double Slit Experiment. The separation between the slits is 0.25 mm. The interference is observed 1.5 m away from the slits. The linear separation between first maxima of the two wavelengths is :

    Solution

     

     

  • Question 9
    4 / -1

    A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back emf of 210 V. What is the current in the armature when the motor is running at full speed?

    Solution

    The current at full speed is given as

    la = (Ea−Eb) / R

    Here,

    Ea = 220 V,

    Eb = 210 V,

    R = 2Ω

    SO

    la = (220−210) / 2

    =10 / 2

    Thus, we get

    la=5 A

    Hence, the correct option is (B).

     

     

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