CUET · MATHS · PYQ PAPER 2023
If \(A=\left[\begin{array}{lll}a & 0 & 0 \\ 0 & a & 0 \\ 0 & 0 & a\end{array}\right], a \neq 0\) then \(|\operatorname{adj} A|\) is equal to
- A \(a ^3\)
- B \(a ^9\)
- C \(a ^6\)
- D \(a ^{27}\)
Answer & Solution
Correct Answer
(C) \(a ^6\)
Step-by-step Solution
Detailed explanation
\(|A| = \det\left(\left[\begin{array}{lll}a & 0 & 0 \\ 0 & a & 0 \\ 0 & 0 & a\end{array}\right]\right) = a^3\) \(|\operatorname{adj} A| = |A|^{n-1}\) \(|\operatorname{adj} A| = (a^3)^{3-1} = (a^3)^2 = a^6\)
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from MATHS
- Let A be a non-singular square matrix of order 3 and |adj A| = 5 then |A| is equal toCUET 2025 Medium
- The relation \(R\) on the set \(N \times N\) defined by \((a, b) R(c, d) \Longleftrightarrow a+d=b+c\), \(\forall(a, b),(c, d) \in N \times N\), where N is the set of natural numbers, is:CUET 2023 Hard
- \(\int \frac{\sin x-x \cos x}{x(x+\sin x)} d x=\) (where \(C\) is an arbitrary constant)CUET 2025 Easy
- The present value of a perpetuity of ₹2,500 payable at the end of each year, if money is worth 10% compounded annually, is:CUET 2023 Medium
- Assuming the same rate of change continues for the following data :
The equation of the straight line trend using the least square method is :Year(X) 2019 2020 2021 2022 2023 Profit in Percentage (y) 38 40 65 72 69 CUET 2025 Easy - The distance of the plane \(\vec{r} \cdot(2 \hat{i}-\hat{j}+\hat{k})=3\) from the origin is :CUET 2023 Easy
More PYQs from CUET
- Read the given passage carefully and answer the questions
Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Sustained high fever (39° to 40°C), weakness, stomach pain, constipation, headache and loss of appetite are some of the common symptoms of this disease. Typhoid fever could be confirmed by Widal test. Plasmodium enters the human body as sporozoites. The parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Cannabinoids are a group of chemicals, which interact with cannabinoid receptors present principally in the brain. Generally taken by inhalation and oral ingestion, these are known for their effects on cardiovascular system of the body.
In which organ of the human body, cannabinoid receptors are principally present?CUET 2025 Hard - Match List-l with List-ll
List-l (Term) List-II (Feature) (A) Multiple alleles (I) Variation in DNA (B) Mendelian disorder (II) Non segregation of chromatids during cell division (C) Chromosomal disorder (III) Pedigree analysis (D) Mutation (IV) Population study
Choose the correct answer from the options given below:CUET 2025 Easy - For \(x \in\left(0, \frac{\pi}{2}\right), \int \frac{1}{\sin ^2 x+\sin 2 x} d x\) is equal toCUET 2025 Easy
- Read the given passage carefully and answer the questions
Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Sustained high fever (39° to 40°C), weakness, stomach pain, constipation, headache and loss of appetite are some of the common symptoms of this disease. Typhoid fever could be confirmed by Widal test. Plasmodium enters the human body as sporozoites. The parasites initially multiply within the liver cells and then attack the red blood cells (RBCs) resulting in their rupture. The rupture of RBCs is associated with release of a toxic substance, haemozoin, which is responsible for the chill and high fever recurring every three to four days. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa-associated lymphoid tissue (MALT). In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Cannabinoids are a group of chemicals, which interact with cannabinoid receptors present principally in the brain. Generally taken by inhalation and oral ingestion, these are known for their effects on cardiovascular system of the body.
Which one of the following structures constitute about 50 percent of the lymphoid tissue in the human body?CUET 2025 Easy - Area bounded between the parabola \(y=x^2-2\) and the line \(y=x\) in square units is:CUET 2023 Hard
- The area of the region bounded by the curve y = x + 1, x-axis and the lines x = 2 and x = 3 isCUET 2025 Easy