Numpy MCQs with answers Page - 7

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Q. Which NumPy function converts a 1D array into a 2D column vector?

  • (A) reshape(-1, 1)
  • (B) flatten()
  • (C) ravel()
  • (D) expand_dims()

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Q. How do you select all rows of a 2D NumPy array where column 0 is greater than 5?

  • (A) arr[arr[:,0]>5]
  • (B) arr[0]>5
  • (C) arr[arr>5, 0]
  • (D) arr[arr>5][:,0]

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Q. What does np.isnan(np.nan) return?

  • (A) True
  • (B) False
  • (C) None
  • (D) Error

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Q. How to get the index of the maximum value in a NumPy array?

  • (A) np.argmax()
  • (B) np.maxindex()
  • (C) np.indexmax()
  • (D) np.topindex()

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Q. Which function calculates the variance of NumPy array elements?

  • (A) np.variance()
  • (B) np.var()
  • (C) np.std()
  • (D) np.mean()

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Q. Which of the following is NOT a valid NumPy data type?

  • (A) int32
  • (B) float64
  • (C) str64
  • (D) complex128

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Q. How to compute the cross product of two vectors?

  • (A) np.cross()
  • (B) np.dot()
  • (C) np.product()
  • (D) np.multiply()

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Q. Which function returns the matrix inverse in NumPy?

  • (A) np.linalg.inv()
  • (B) np.inverse()
  • (C) np.matinv()
  • (D) np.inverse_mat()

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Q. What does np.allclose(a, b) check?

  • (A) Whether all elements are exactly equal
  • (B) Whether all elements are numerically close within a tolerance
  • (C) Whether arrays a and b have the same shape
  • (D) Whether arrays contain all non-zero values

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Q. Which of these will raise an error when passed to np.array()?

  • (A) [[1,2],[3,4]]
  • (B) [1,2,3]
  • (C) [[1,2],[3]]
  • (D) np.arange(5)

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