CBSE Class 12 Shorthand English Question Paper 2023 with Answer Key (February 16, Set - 349)

CBSE CLASS XII Questions

• 1.

  Write the name of basic building units of proteins and nucleic acids. How can you differentiate between Fibrous and Globular proteins on the basis of their structures ?

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• 2.

  Identify the plant in which emasculation is not required for artificial hybridization.
  

  • Rice
    
  • Wheat
    
  • Pea
    
  • Papaya
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• 3.

  Identify the parts P, Q, R, S in the figure given below and select the option in the correct order.

  

  • P - Seed, Q - Thalamus, R - Mesocarp, S - Endocarp
    
  • P - Thalamus, Q - Seed, R - Endocarp, S - Mesocarp
    
  • P - Seed, Q - Thalamus, R - Endocarp, S - Mesocarp
    
  • P - Thalamus, Q - Seed, R - Mesocarp, S - Endocarp
    
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• 4.

  A magnet held vertically, with its north pole down, is dropped along the axis of a closed solenoid placed vertically on a table. If the observer looks down from the top,

  • the induced current will flow in the anticlockwise direction.
  • the induced current will flow in the clockwise direction.
  • no induced current will flow in the solenoid.
  • the magnet will fall with a constant velocity.
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• 5.

  The number of free electrons per unit volume ($\text{m}^3$) in a wire made of copper (resistivity $1.72 \times 10^{-8}\,\Omega\,\text{m}$) is $8.5 \times 10^{28}$. Calculate the average number of collisions made by an electron in one second when an electric field is maintained in the wire.

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• 6.

  (i) How does a farmer use dormancy of seed to his advantage ?

  (ii) Differentiate between pea seed and castor seed.

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