CBSE Class 12 Physics Question Paper 2017 (Set 55/2/3)

CBSE CLASS XII Questions

• 1.

  (I) The real image of an object placed between $f$ and $2f$ from a convex lens can be seen on a screen placed at the image location. If the screen is removed, is the image still there? Explain.

  (II) Plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.

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• 2.

  The resistance of a metal wire at \(20^\circ\text{C}\) is \(1.05\,\Omega\) and at \(100^\circ\text{C}\) is \(1.38\,\Omega\). Determine the temperature coefficient of resistivity of this metal.

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• 3.

  Two point charges -Q and Q are located at points (d, 0) and (0, d) respectively, in x-y plane. The electric field E at the origin will be:
  

  • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (\hat{i} - \hat{j})\)
    
  • \(\frac{1}{4\pi\epsilon_0} \frac{\sqrt{2}Q}{d^2} (-\hat{i} - \hat{j})\)
    
  • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (\hat{i} - \hat{j})\)
    
  • \(\frac{1}{4\pi\epsilon_0} \frac{Q}{d^2} (-\hat{i} - \hat{j})\)
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• 4.

  In a region, the electric potential varies as \(V = 10 - 50x\), where \(V\) is in volts and \(x\) is in meters. The electric field in the region is

  • \(10\ \text{N/C}\) along \(+x\)
    
  • \(10\ \text{N/C}\) along \(-x\)
    
  • \(50\ \text{N/C}\) along \(+x\)
    
  • \(50\ \text{N/C}\) along \(-x\)
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• 5.

  A parallel beam of monochromatic light falls normally on a single slit of width $a$ and a diffraction pattern is observed on a screen placed at distance $D$ from the slit. Explain:

  (I) the formation of maxima and minima in the diffraction pattern, and

  (II) why the maxima go on becoming weaker and weaker with its increasing number $n$.

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• 6.

  Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from this plot.

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