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JEE Main Test 57
Result
JEE Main Test 57

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  • Question 1/10
    4 / -1

    Solutions

     

  • Question 2/10
    4 / -1

    If p, q, r are positive and are in A.P, the roots of the quadratic equation px2 + qx + r = 0 are real for

    Solutions

     

  • Question 3/10
    4 / -1

    Solutions

     

  • Question 4/10
    4 / -1

    Solutions


     

  • Question 5/10
    4 / -1

    A coil of inductance 0.20 H is connected in series with a switch and a cell of emf 1.6 V. The total resistance of the current is  What is the initial rate of growth of the current when the switch is closed?

    Solutions

     

  • Question 6/10
    4 / -1

    An object of mass 10 kg is launched from the ground at t = 0, at an angle of 37° above the horizontal with a speed of 30 m/s. At some time after its launch, an explosion splits the projectile into two pieces. One piece of mass 4 kg is observed (at 105 m, 43 m) at t = 2s. Find the location of second piece at t = 2s.

    Solutions

     

  • Question 7/10
    4 / -1

    Solutions

     

  • Question 8/10
    4 / -1

    Which of the following will have the highest coagulating power for a ferric hydroxide solution?

    Solutions

    Ferric hydroxide is a positive sol. Hence, coagulation will depend upon coagulating power of an anion, which is directly proportional to the valency of an anion (Hardy Schulze rule). Out of the given options, [Fe(CN)6]4- has high charge with high coagulating power.

     

  • Question 9/10
    4 / -1

    To an aqueous solution of AgNO3, some NaOH (aq) is added till a brown precipitate is obtained. To this, H2O2is added drop-wise. The precipitate turns black with the evolution of O2. The black precipitate is

    Solutions

     

  • Question 10/10
    4 / -1

    On hydrolysis, (Me)2SiCI2 will produce

    Solutions

    Dimethyl dichlorosilane will undergo hydrolysis to form siloxane polymers. Due to very large size difference between Si atom and oxygen atom, it fails to form a π-bond and so, the product of hydroglysis of Me2SiCI2 is polymeric i.e. [-O-Me2Si-O-]n.

     

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