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Question Paper (Section wise)

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Question 1
Positive Marks: 4 / Negative Marks: 1
  • 1)

    A square loop ABCD carrying a current i, is placed near and coplanar with a long straight conductor XY, carrying a current I, the net force on the loop will be:

     

  • 2)

    A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is: (Take 1 cal = 4.2 Joules).

    1. 2.365 W

    2. 23.65W

    3. 236.5W

    4. 2365W

  • 3)

    An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is:

  • 4)

    When a metallic surface is illuminated with radiation of wavelength λ, the stopping potential is V. If the same surface is illuminated with radiation of wavelength 2λ, the stopping potential is . The threshold wavelength for the metallic surface is:

  • 5)

    Given the value of Rydberg constant is 107 m–1 the wave number of the last line of the Balmer series in hydrogen spectrum will be:

    1. 0.025 × 104 m–1

    2. 0.5 × 107 m–1

    3. 0.25 × 107 m–1

    4. 2.5 × 107 m–1

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