1
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
If $$\left[ {\matrix{ {3c + 6} & {a - d} \cr {a + d} & {2 - 3b} \cr } } \right] = \left[ {\matrix{ {12} & 2 \cr { - 8} & { - 4} \cr } } \right]$$ are equal, then value of ab $-$$ cd is
A
4
B
16
C
$$-$$ 4
D
$$-$$ 16
2
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
The principal value of $${\tan ^{ - 1}}\left( {\tan {{9\pi } \over 8}} \right)$$ is
A
$${\pi \over 8}$$
B
$${{3\pi } \over 8}$$
C
$$ - {\pi \over 8}$$
D
$$ - {{3\pi } \over 8}$$
3
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
For two matrices $$P = \left[ {\matrix{ 3 & 4 \cr { - 1} & 2 \cr 0 & 1 \cr } } \right]$$ and $${Q^T} = \left[ {\matrix{ { - 1} & 2 & 1 \cr 1 & 2 & 3 \cr } } \right]$$ P $$-$$ Q is
A
$$\left[ {\matrix{ 2 & 3 \cr { - 3} & 0 \cr 0 & { - 3} \cr } } \right]$$
B
$$\left[ {\matrix{ 4 & 3 \cr { - 3} & 0 \cr { - 1} & { - 2} \cr } } \right]$$
C
$$\left[ {\matrix{ 4 & 3 \cr 0 & { - 3} \cr { - 1} & { - 2} \cr } } \right]$$
D
$$\left[ {\matrix{ 2 & 3 \cr 0 & { - 3} \cr 0 & { - 3} \cr } } \right]$$
4
CBSE 12th Math (Term 1) Paper 2021-22
MCQ (Single Correct Answer)
+1
-0
The function $$f(x) = 2{x^3} - 15{x^2} + 36x + 6$$ is increasing in the interval
A
($$-$$ $$\infty$$, 2) $$\cup$$ (3, $$\infty$$)
B
($$-$$ $$\infty$$, 2)
C
($$-$$ $$\infty$$, 2] $$\cup$$ [3, $$\infty$$)
D
[3, $$\infty$$)
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