MTH100 Quiz 1

Q1. Two matrices of same order can be.....

1. added and subtracted
2. added but not subtracted
3. multiplied
4. subtracted but not added

Correct answer: added and subtracted

Q2. Determinant of null matrix is---

1. 3
2. 0
3. 1
4. 2

Correct answer: 0

Q3. If the order of matrix A is 2×3 then what should be the order of matrix B such that addition of matrices A and B is possible.

1. 3×2
2. 2×2
3. 3×5
4. 2×3

Correct answer: 2×3

Q4. The Minor of an element in a third-order determinant is a ............ determinant obtained by deleting the row and column that contains the element.

1. fifth order
2. second order
3. fourth order
4. third order

Correct answer: second order

Q5. What is the determinant of the identity matrix of order 3?

1. 3
2. 2
3. 1
4. 0

Correct answer: 1

Q6. By changing the signs of all elements of a matrix, we obtained

1. negative of a matrix
2. identical matrix
3. determinant of a matrix
4. zero matrix

Correct answer: negative of a matrix

Q7. If A is a matrix of order m×n, and B is a matrix of order n×p, what is the order of the product AB?

1. p×m
2. m×p
3. n×n
4. m×n

Correct answer: m×p

Q8. Two matrices A and B are multiplied to get BA if

1. number of columns of A is equal to number of columns of B
2. number of rows of A is equal to number of columns of B
3. both have same order
4. both are rectangular

Correct answer: number of rows of A is equal to number of columns of B

Q9. Given a square matrix A, if there exists a matrix B such that AB = BA = I, then A is called the ………….. of B

1. Adjoint
2. Additive inverse
3. Multiplicative inverse
4. Transpose

Correct answer: Multiplicative inverse

Q10.

1. column matrix
2. diagonal matrix
3. row matrix
4. zero matrix

Correct answer: row matrix