CBSE Class 12 Bengali Question Paper 2012 (Set 5)

4ADFK1

• 1.

  "Under the provisions stated in Section 20 and Section 21 of the Reserve Bank of India (RBI) Act, 1934, the RBI is mandated to handle the banking operations of the Government of India."
  In the light of the given statement, elaborate the indicated function of the Reserve Bank of India.

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• 2.

  Consider a cylindrical conductor of length \( l \) and area of cross-section \( A \). Current \( I \) is maintained in the conductor and electrons drift with velocity \( \vec{v}_d \, (|\vec{v}_d| = \frac{eE}{m} \tau) \), where symbols have their usual meanings. Show that the conductivity of the material of the conductor is given by \[ \sigma = \frac{n e^2 \tau}{m}. \]

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• 3.

  Rohan failed an important exam. Instead of accepting that he didn't prepare well, he insists that the teacher was biased and the exam was unfair. Which defence mechanism is Rohan using?
  

  • Repression
    
  • Projection
    
  • Rationalization
    
  • Denial
    
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• 4.

  Hari, Murari and Abhi were partners in a firm sharing profits and losses in the ratio of 8 : 7 : 4. Murari retired from the firm on 31st March, 2025. Hari and Abhi decided to share profits in the future in the ratio of 2 : 1. The gaining ratio of Hari and Abhi was:

  • 1 : 2
    
  • 8 : 7
    
  • 2 : 1
    
  • 7 : 4
    
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• 5.

  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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• 6.

  Aashree and Manvi were partners in a firm and their capitals were ₹ 6,00,000 and ₹ 4,00,000 respectively. Normal rate of return in a similar business was 15% and the goodwill of the firm was valued at ₹ 3,00,000. If goodwill was calculated at three years purchase of super profits, the average profits of the firm were :

  • ₹ 1,00,000
    
  • ₹ 45,000
    
  • ₹ 2,50,000
    
  • ₹ 1,50,000
    
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