# Matrices & Determinants – Exercise – 1

1. A square matrix all of whose elements except the main diagonal are zeros is called a :

(a) null matrix
(b) singular matrix
(c) diagonal matrix
(d) symmetric matrix

Answer
Answer : (c)
Explanation
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2. Square matrix A for which AT = -A is called a :

(a) row matrix
(b) column matrix
(c) symmetric matrix
(d) skew-symmetric matrix

Answer
Answer : (d)
Explanation
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3. Square matrix A for which AT = A is called a :

(a) row matrix
(b) column matrix
(c) symmetric matrix
(d) skew-symmetric matrix

Answer
Answer : (d)
Explanation
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4. A square matrix A with complex entries for which (A)= –A is called :

(a) identity matrix
(b) hermitian matrix
(c) symmetric matrix
(d) skew-hermitian matrix

Answer
Answer : (d)
Explanation
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5. This matrix is a _______ . (a) null matrix
(b) row matrix
(c) square matrix
(d) symmetric matrix

Answer
Answer : (a)
Explanation
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