CBSE  /  Class 12  /  Maths  /  Matrices

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

  • 2, 2, 3, 4
  • 2, 3, 1, 2
  • 3, 3, 0, 1
  • None of these

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

  • B = 1

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

  • m × n matrix
  • n × m matrix
  • n × n matrix
  • m × m matrix

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

  • 2I
  • 3I
  • -2I
  • null matrix

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

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