NDA & NA Exam (II)- 2025 - Mathematics Defence Question Paper

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NDA & NA Exam (II)- 2025 - Mathematics

NDA & NA Exam (II)- 2025 - Mathematics Defence Questions

1.
If \( p^{x} = q^{y} = r^{z} \), where \( x, y \) and \( z \) are in GP, then consider the following statements:
I. \( p, q \) and \( r \) are in AP.
II. \( \ln p, \ln q \) and \( \ln r \) are in GP.
Which of the statements given above is/are correct?
A.
I only
B.
II only
C.
Both I and II
D.
Neither I nor II
ANSWER :
B. II only
2.
If \( A \) and \( B \) are non-empty subsets of a set, and \( A^{c} \) and \( B^{c} \) represent their complements, then which of the following is/are correct?
I. \( A - B = B^{c} - A^{c} \)
II. \( A - B^{c} = A^{c} - B \)
Select the answer using the code given below.
A.
I only
B.
II only
C.
Both I and II
D.
Neither I nor II
ANSWER :
A. I only
3.
Let \( y = x! \) and \( z = (2x)! \). If \( \left(\frac{z}{y}\right) = 120 \), then what is the value of \( (3x)! \)?
A.
362880
B.
181440
C.
90720
D.
45360
ANSWER :
A. 362880
4.
Let \( n \) be a natural number. The number of consecutive zeros at the end of the expansion of \( n! \) is exactly 2. How many values of \( n \) are possible?
A.
3
B.
4
C.
5
D.
More than 5
ANSWER :
C. 5
5.
If \( (10 + \log_{10} x) \), \( (10 + \log_{10} y) \) and \( (10 + \log_{10} z) \) are in AP, then consider the following statements:
I. The GM of \( x \) and \( z \) is \( y^{2} \).
II. The AM of \( \log_{10} x \) and \( \log_{10} z \) is \( \log_{10} y \).
Which of the statements given above is/are correct?
A.
I only
B.
II only
C.
Both I and II
D.
Neither I nor II
ANSWER :
B. II only
6.
How many terms of the series \( 1 + 3 + 5 + 7 + \ldots \) amount to a sum equal to 12345678987654321?
A.
11111111
B.
110000011
C.
111101111
D.
111111111
ANSWER :
D. 111111111
7.
How many terms are identical in the two APs 19, 21, 23, ... up to 110 terms and 19, 22, 25, 28, ... up to 75 terms?
A.
35
B.
36
C.
37
D.
38
ANSWER :
C. 37
8.
If
\( \omega = \frac{1 + \sqrt{-3}}{2} \)
then what is the value of \( (1 + \omega^{10} - \omega^{35})^{100} - (1 - \omega^{25} + \omega^{38})^{50} \)?
A.
-2
B.
-1
C.
0
D.
2
ANSWER :
C. 0
9.
What is the remainder when \( 5^{99} \) is divided by 13?
A.
10
B.
9
C.
8
D.
6
ANSWER :
C. 8
10.
What is the value of the determinant of the inverse of the matrix
\( \begin{bmatrix} -4 & -5 \\ 2 & 2 \end{bmatrix} \)?
A.
\( \frac{1}{2} \)
B.
1
C.
2
D.
4
ANSWER :
A. \( \frac{1}{2} \)