1
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
For the following two (02) items:
Let $\alpha$ and $\beta $ be the roots of the quadratic equation
$(x^{2}+(\log _{0.5}(\alpha ^{2}))x+(\log _{0.5}(\alpha ^{2}))^{4}=0$
where $a ^ 2 \ne1$ and $\log _{0.5}(\alpha ^{2})>0$ Further, $\beta ^{2}=\alpha (\log _{\alpha ^{2}}(0.5))$
 
What is the relation between α and β 
1
α = 2β 
2
2α = β 
3
α = - 2β 
4
2α = -β 
2
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
For the following two (02) items:
Let $p=\sum_{j=1}^{n}\log_{10}2^{j} and q=\sum_{j=1}^{n}\log_{10}5^{j}$
If p + q = 66 then which one of the following is correct?
1
n < 7
2
7 < n < 9
3
9 < n < 12
4
n > 12
3
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
For the following two (02) items:
Let $p=\sum_{j=1}^{n}\log_{10}2^{j} and q=\sum_{j=1}^{n}\log_{10}5^{j}$
If p + q = 15 then what is equal to? q - p
1
$\log_{10} 2 \cdot 5$
2
$5\log_{10} 2 \cdot 5$
3
$10\log_{10} 2 \cdot 5$
4
$15\log_{10} 2 \cdot 5$
4
NDA Mathematics 14th September 2025
MCQ (Single Correct Answer)
+2.5
-0.833
Change Language
For the following two (02) items:
Let sin A + sin B = p and cos A + cos B = q
What is p/q equal to?
1
$\tan\left(\frac{A-B}{2}\right)$
2
$\cot\left(\frac{A-B}{2}\right)$
3
$\tan\left(\frac{A+B}{2}\right)$
4
$\cot\left(\frac{A+B}{2}\right)$