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Physics Test - 26

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Physics Test - 26
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  • Question 1
    1 / -0
    A thin liquid film formed between a U-shaped wire and a light slider supports aweight of 1.5 x10^–2 N (see figure). The length of the slider is 30 cm and its weight negligible. The surface tension of the liquid film is
  • Question 2
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    Two coherent point sources S1 and S2 are separated by a small distance ‘d’ as shown. The fringes obtained on the screen will be:
  • Question 3
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    Helium gas goes through a cycle ABCDA (consisting of two isochoric and two isobaric lines) as shown in figure. Efficiency of this cycle is nearly: (Assume the gas to be close to ideal gas)
  • Question 4
    1 / -0
    In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n – 1). If n >> 1, the frequency of radiation emitted is proportional to
  • Question 5
    1 / -0
    The I – V characteristic of an LED is
  • Question 6
    1 / -0
    A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating; it is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to :
  • Question 7
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    A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is:
  • Question 8
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  • Question 9
    1 / -0
    Diameter of plano-convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 × 10^8 m/s, the focal length of the lens is :
  • Question 10
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    This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.If two springs S1 and S2 of force constants k1 and k2, respectively, are stretched by the same force, it is found that more work is done on spring S1 than on spring S2.Statement 1 : If stretched by the same amount, work done on S1, will be more than that on S2Statement 2 : k1 < k2
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