CBSE Class 12 Maths Matrices Quiz 3

1. If \(\left[\begin{array}{cc}

A 2, 2, 3, 4 B 2, 3, 1, 2 C 3, 3, 0, 1 D None of these

2. If AB = A and BA = B, then

A B = 1

3. If A is a m × n matrix such that AB and BA are both defined, then B is an

A m × n matrix B n × m matrix C n × n matrix D m × m matrix

4. If A = \(\left[\begin{array}{cc}1 & 2\\3 & 4\end{array}\right]\) then A– 5A is equal to

A 2I B 3I C -2I D null matrix

5. If A and B are 2 × 2 matrices, then which of the following is true?

A (A + B)² = A² + B² + 2AB B (A – B)² = A² + B² – 2AB C (A – B)(A + B) = A² + AB – BA – B² D (A + B) (A – B) = A² – B²