CBSE Class 10 Gurung Question Paper 2020 with Answer Key (February 22)

CBSE X Questions

• 1.

  For any natural number n, \( 5^n \) ends with the digit :
  

  • 0
    
  • 5
    
  • 3
    
  • 2
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• 2.

  A trader has three different types of oils of volume \(870 \text{ l}\), \(812 \text{ l}\) and \(638 \text{ l}\). Find the least number of containers of equal size required to store all the oil without getting mixed.
  

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• 3.

  Prove that: \(\frac{\sec^3 \theta}{\sec^2 \theta - 1} + \frac{\csc^3 \theta}{\csc^2 \theta - 1} = \sec \theta \cdot \csc \theta (\sec \theta + \csc \theta)\)
  

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• 4.

  Paddy fields require a large amount of water. The pesticides and chemical fertilizers used are washed down into the soil or waterbodies. How do these chemicals reach our bodies? What is this phenomenon known as?

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• 5.

  Prove that \(2 + 3\sqrt{5}\) is an irrational number given that \(\sqrt{5}\) is an irrational number.
  

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• 6.

  Assertion : In human beings, the respiratory pigment is haemoglobin present in red blood cells.
  Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.
  

  • Both, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
    
  • Both, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
    
  • Assertion (A) is true, but Reason (R) is false.
    
  • Assertion (A) is false, but Reason (R) is true.
    
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