Learn Without Walls

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Pre-Assessment

Module 8: Introduction to Matrices

About This Assessment

This pre-assessment helps us understand what you already know about matrices before you begin the module. Your answers will not be graded - this is simply a baseline measurement.

Time: 5-10 minutes | Questions: 5 | Purpose: Baseline measurement

Question 1

What is the dimension of the matrix A = [[1, 2, 3], [4, 5, 6]]?

A. 2 x 3
B. 3 x 2
C. 2 x 2
D. 3 x 3

Question 2

If A = [[2, 3], [4, 5]] and B = [[1, 0], [0, 1]], what is A + B?

A. [[3, 3], [4, 6]]
B. [[2, 0], [0, 5]]
C. [[3, 4], [5, 6]]
D. [[1, 3], [4, 4]]

Question 3

What is the determinant of the matrix A = [[3, 2], [1, 4]]?

A. 10
B. 12
C. 14
D. 2

Question 4

Which of the following matrices is the identity matrix of size 2 x 2?

A. [[1, 0], [0, 1]]
B. [[0, 1], [1, 0]]
C. [[1, 1], [1, 1]]
D. [[0, 0], [0, 0]]

Question 5

If A = [[2, 1], [3, 4]] and B = [[1, 0], [2, 1]], what is the product AB (first row, first column entry)?

A. 2
B. 3
C. 4
D. 5

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Remember, this is just a baseline assessment. Your answers help us understand your starting point.

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