1
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following for the next two (02) items that follow : 

Let Δ(a, b, c, α) = $\left|\begin{array}{ccc} a & b & a \alpha+b \\ b & c & b \alpha+c \\ a \alpha+b & b \alpha+c & 0 \end{array}\right|$

If Δ(a, b, c, α) = 0 for every α > 0, then which one of the following is correct ? 
A
a, b, c are in AP 
B
a, b, c are in GP 
C
a, 2b, c are in AP 
D
a, 2b, c are in GP
2
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following for the next two (02) items that follow : 

Let Δ(a, b, c, α) = $\left|\begin{array}{ccc} a & b & a \alpha+b \\ b & c & b \alpha+c \\ a \alpha+b & b \alpha+c & 0 \end{array}\right|$

If Δ(7, 4, 2, α) = 0, then α is a root of which one of the following equations ? 
A
7x2 + 4x + 2 = 0
B
7x2 - 4x + 2 = 0
C
7x2 + 8x + 2 = 0
D
7x2 - 8x + 2 = 0
3
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following for the next two (02) items that follow :

Given that m(θ) = cot2θ + n2tan2θ + 2n, where n is a fixed positive real number. 

What is the least value of m(θ) ?
A
n
B
2n
C
3n
D
4n
4
NDA Mathematics 16 April 2023
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language

Consider the following for the next two (02) items that follow :

Given that m(θ) = cot2θ + n2tan2θ + 2n, where n is a fixed positive real number. 

Under what condition does m attain the least value ? 
A
n = tan2θ
B
n = cot2θ
C
n = sin2θ
D
n = cos2θ
EXAM MAP