Matrices — Practice Quiz
ICSE · Class 12 · Mathematics
Try a 4-question quiz on Matrices for ICSE Class 12 Mathematics: tap an answer to check it and see why. 97 questions in the full chapter test.
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Quick Quiz: Matrices
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A matrix of order m×n has how many elements?
A matrix having only one row is called a:
A square matrix in which all non-diagonal elements are zero is called:
The identity matrix I satisfies:
Sample Questions
Matrix addition A + B is defined only when:
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A and B have the same order
Matrix addition requires A and B to have the exact same order (same number of rows and same number of columns).
If A is a 2×3 matrix and B is a 3×4 matrix, the order of AB is:
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2×4
If A is m×p and B is p×n, then AB is m×n. Here A is 2×3 and B is 3×4, so AB is 2×4.
Matrix multiplication is commutative, i.e., AB = BA always.
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False
Matrix multiplication is NOT commutative. In general AB ≠ BA. Even when both products are defined and of the same order, they need not be equal.
The transpose of a matrix A = [a_ij]_{m×n} is:
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[a_ji]_{n×m}
Transpose swaps row and column indices: (A^T)_ij = a_ji. The order also swaps from m×n to n×m.
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