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Physics Test - ...

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  • Question 1
    1 / -0.25

    In amplitude modulation, the amplitude of the carrier wave is Ac,and that of the modulating signal is Am. In practice, the ratio of Amto Acis kept less than or equal to one, to avoid

  • Question 2
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    The frequency of a sonometer wire is f but when the weights producing tension are completely immersed in water the frequency becomes f/2 and on immersing the weights in certain liquid the frequency becomes f/3. The specific gravity of the liquid is

  • Question 3
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    A heat engine has an efficiency η. Temperatures of source and sink are each decreased by 100 K. Then, the efficiency of the engine.

  • Question 4
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    Which of these is correct in regard to a magnet?

  • Question 5
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    The mean lives of radioactive substances are 1620 y and 405 y for α- emission and β- emission respectively. Find out the time during which three-fourth of a sample will decay if it is decaying both by α- emission and β- emission simultaneously.

  • Question 6
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    When the velocity of an electron increases, its de-Broglie wavelength

  • Question 7
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    A charge q is located at the centre of a cube. The electric flux through any face is

  • Question 8
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    Glass has refractive index μwith respect to air and the critical angle for a ray of light going from glass to air is an if a ray of light is incident from the air on the glass with the angle of incidence, a corresponding angle of refraction is

  • Question 9
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    A molecule of water on the surface experiences a net

  • Question 10
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    The S I unit and dimensions of Stefan 's constant σin case of Stefan 's law of radiation is

  • Question 11
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    V-I characteristics of LED is shown correctly by graph

  • Question 12
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    The refractive index of the crystal material is 1.68, and that of castor oil is 1.2. When a ray of light passes from oil to glass, its velocity will change by a factor

  • Question 13
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    Six very long insulated (topper wires are bound together to form a cable. The currents carried by the wires are l1= +10 A, l2= - 13A , l3= +10A, l4= + 7A, l5= 12A and l6= 18A. The magnetic induction at a perpendicular distance of 10 cm from the cable is (μ0= 4πx 10-7Wb/A-m)

  • Question 14
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    In case of dimension of electric field and electric dipole moment the power of mass is respectively,

  • Question 15
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    For homogeneous isotropic material, which one of the following cannot be the value of Poisson ’s ratio?

  • Question 16
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    A circular coil and a square coil is prepared from two identical metal wires and a current is passed through The ratio of magnetic dipole moment associated with circular coil to that of square coil is

  • Question 17
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    Figure show the circular coil carrying current l kept very close but not touching at a point A on a straight conductor carrying the same current I. The magnitude of magnetic induction at the centre of the circular coil will be

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