CBSE Class 12 Mathematics (For Blind) Question Paper 2020 with Answer Key (March 17, Set 4 - 65/B)

CBSE CLASS XII Questions

• 1.

  The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

  • \( \dfrac{3h}{2\pi} \)
    
  • \( \dfrac{2h}{\pi} \)
    
  • \( \dfrac{h}{\pi} \)
    
  • \( \dfrac{h}{2\pi} \)
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• 2.

  In an economy, the currency held by the public, Net Demand Deposits with Commercial Banks and Net Time Deposits with Commercial Banks stand at ₹ 1,42,000 crore, ₹ 22,000 crore and ₹ 86,000 crore respectively. The value of Money Supply (M1) would be ₹ _______ crore.

  • 2,50,000
    
  • 86,000
    
  • 1,64,000
    
  • 1,42,000
    
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• 3.

  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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• 4.

  Which of the following is not related to positive attitude?

  • It makes a person happier.
    
  • It helps to build and maintain relationships.
    
  • It decreases one's chances of success.
    
  • It helps to make better decisions.
    
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• 5.

  Which of the following is not the stage of active listening?
  

  • Receiving
    
  • Understanding
    
  • Remembering
    
  • Non responding
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• 6.

  The idea of use and disuse of organs for evolution of organism was proposed by
  

  • Charles Darwin
    
  • Thomas Malthus
    
  • Hugo De Vries
    
  • Lamarck
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