CBSE Class 12 Data Management Application Compartment Question Paper 2017 with Answer Key (July 17)

CBSE CLASS XII Questions

• 1.

  Three students run on a racing track such that their speeds add up to 6 km/h. However, double the speed of the third runner added to the speed of the first results in 7 km/h. If thrice the speed of the first runner is added to the original speeds of the other two, the result is 12 km/h. Using the matrix method, find the original speed of each runner.

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• 2.

  Your school is planning to host the Annual Awards Function on Saturday, 9th April. On behalf of the Principal, draft a formal invitation card to be sent to the parents and other guests inviting them for the function. Mention a compelling highlight of the celebration along with other details.

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• 3.

  Two conductors A and B of the same material have their lengths in the ratio 1:2 and radii in the ratio 2:3. If they are connected in parallel across a battery, the ratio \( \frac{v_A}{v_B} \) of the drift velocities of electrons in them will be:

  • 2
    
  • \( \frac{1}{2} \)
    
  • \( \frac{3}{2} \)
    
  • \( \frac{8}{9} \)
    
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• 4.

  Explain the basis on which gel electrophoresis technique works. Write any two ways the products obtained through this technique can be utilised.

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• 5.

  In the circuit, three ideal cells of e.m.f. \( V \), \( V \), and \( 2V \) are connected to a resistor of resistance \( R \), a capacitor of capacitance \( C \), and another resistor of resistance \( 2R \) as shown in the figure. In the steady state, find (i) the potential difference between P and Q, (ii) the potential difference across capacitor C.
  

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• 6.

  The ratio of the number of turns of the primary to the secondary coils in an ideal transformer is 20:1. If 240 V AC is applied from a source to the primary coil of the transformer and a 6.0 \( \Omega \) resistor is connected across the output terminals, then the current drawn by the transformer from the source will be:

  • 4.0 A
    
  • 3.8 A
    
  • 0.97 A
    
  • 0.10 A
    
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