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JEE Main Test 130
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JEE Main Test 130
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  • Question 1/10
    4 / -1

    Solutions

     

  • Question 2/10
    4 / -1

    Two identical charged spheres suspended from a common point by two massless strings of length l are initially a distance d(d < < l) apart because of their mutual repulsion. The charge begins to leak from both the spheres at a constant rate. As a result charges approach each other with a velocity v. Then, as a function of distance x between them

    Solutions

     

  • Question 3/10
    4 / -1

    How many times more intense is a 60 dB sound than a dB sound?

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  • Question 4/10
    4 / -1

    sech-1 (sin θ) is equal to

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  • Question 5/10
    4 / -1

    A battery of emf E has an internal resistance r. A variable resistance R is connected to the terminals of the battery. A current i is drawn from the battery. V is the terminal potential difference. If R alone is gradually reduced to zero, which of the following best describes i and V?

    Solutions

     

  • Question 6/10
    4 / -1

    A parallel plate air capacitor has a capacitance C. When it is half filled with a dielectric of dielectric constant 5, the percentage increase in the capacitance will be

    Solutions

     

  • Question 7/10
    4 / -1

    If the lines x + 3y - 9 = 0, 4x + by - 2 = 0 and 2x - y - 4 = 0 are concurrent, then b is equal to

    Solutions

     

  • Question 8/10
    4 / -1

    The number of turns in primary and secondary coils of a transformer is 50 and 200, respectively. If the current in the primary coil is 4 A, then the current in the secondary coil is

    Solutions

     

  • Question 9/10
    4 / -1

    Which types of losses do not occur in the transformer ?

    Solutions

    Iron losses:-  In actual iron cores, inspite of  lamination, eddy currents are produced. The magnitude of eddy current may be small and a part of energy is lost as the heat produced in an iron core.

    Copper losses:-  In practice the coils of the transformer posses resistance. So, a part of energy is lost due to the heat produced in resistance of coil.

    Flux Leakage:-  The coupling between the coils is seldom perfect. So, whole of the magnetic flux produced by the primary coil is not linked up with secondary coil.

     

  • Question 10/10
    4 / -1

    A circular coil of radius R = 10 cm having 500 turns and total resistance 2 Ω is placed initially perpendicular to the earth's magnetic field of 3 × 10-5 T. The coil is rotated about its vertical diameter by an angle 2π in 0.5 . The induced current in the coil is

    Solutions

     

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