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Physics Test 98
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Physics Test 98

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  • Question 1/10
    4 / -1

    The electric field line pattern for charges +2q & –q are shown. Select the most appropriate diagram :-

    Solutions

    Field lines are proportional to quantity of charge & they originate at positive charge & terminates at –ve charge or at ∞

     

  • Question 2/10
    4 / -1

    In half deflection method, the resistance of resistance box in series with the galvanometer is 10,000 Ω. When the galvanometer is shunted with 10 Ω resistance, its reading drops to half the initial value. The resistance of galvanometer is :-

    Solutions

     

  • Question 3/10
    4 / -1

    Two air filled capacitors are connected as shown. The left capacitor is suddenly filled with a dielectric of constant K. The work done by battery after that is 24µJ. Dielectric constant K is :-

    Solutions

    WD = ΔQV

    ⇒ ΔQ = 4µC

    Qi = 2×4 / 2+4  ×6 = 8µC

    Qf = 12µC = Ceq × 6

    Ceq = 2 µ F ⇒ C1 = C2 = 4 µF

    k = C1/C0 = 2 

     

  • Question 4/10
    4 / -1

    An infinite cylindrical current carrying wire carries a current that is uniformly distributed over its cross section. The magnetic field as a function of distance from it's axis is :-

    Solutions

    Applying Ampere's Law 

    For inside 

    B2πr = µ0Jπr2

    ⇒ B ∝ r

    For outside

    B2πr = µ0JπR2

    ⇒ B ∝ 1/r

     

  • Question 5/10
    4 / -1

    A metal sheet is being pulled out of a region of magnetic field. If the sheet is non magnetic  :-

    Solutions

    Heat will develop due to eddy current which will oppose the motion and hence a force is required.

     

  • Question 6/10
    4 / -1

    A signal containing multiple frequencies is shown in figure A. It is passed through 2 different filters and then outputs are shown in figure B & C.

    Solutions

    Low pass filter will allow low frequency signal to pass while high pass filter allow high frequency to pass through.

     

  • Question 7/10
    4 / -1

    The sketch shown below illustrates the apparatus and results for a famous experiment. The graph on the right is a polar plot of the number of electrons received in the detector. From the result, the experimenters were able to conclude that :-

    Solutions

    This experiment is the famous Davission-Germer experiment which establishes wave nature of electrons.

     

  • Question 8/10
    4 / -1

    Mass of Bromine, Selenium and Krypton are given as :-

    M80Br = 79.918528 u, M(80Kr) = 79.916376 u, M(80Se) = 79.916521u

    Which of the following β decays are possible?

    Solutions

    Q(i) = (MBr – MKr) c2 > 0

    Q(ii) = (MBr – MSe – 2Me) c2 > 0

    Q(ii) = (MBr – MSe) c2 > 0

     

  • Question 9/10
    4 / -1

    Drawing power from a 12V car battery, a 9V stabilized DC voltage is required to power a car stereo system, attached to the terminals A and B, as shown in the figure. If a Zener diode with ratings, Vz = 9V and Pmax = 0.27 W, is connected as shown in the figure, for the above purpose, the minimum series resistance RS must be :-

    Solutions

     

     

  • Question 10/10
    4 / -1

    When light of wavelength 540 nm passes through a single slit of unknown width, the diffraction pattern displays a second maximum where the first minimum of light of an unknown wavelength had been observed to fall. What is the unknown wavelength ?

    Solutions

    λ1/w = 3 × 540 / 2w

    λ1 = 810  nm

     

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