NDA
Q. If C = [[1, 0, 2], [0, 1, 3], [0, 0, 1]], what is det(C)? (2019)
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Solution
The determinant of an upper triangular matrix is the product of its diagonal elements. Here, det(C) = 1 * 1 * 1 = 1.
Correct Answer: B — 1
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Q. If cos B = 0.6, what is the value of sin B?
A.
0.8
B.
0.6
C.
0.4
D.
0.2
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Solution
Using the Pythagorean identity, sin B = √(1 - cos²B) = √(1 - 0.6²) = √(1 - 0.36) = √(0.64) = 0.8.
Correct Answer: A — 0.8
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Q. If cot A = 1, what is the value of A? (2022)
A.
45°
B.
90°
C.
60°
D.
30°
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Solution
Cotangent is 1 when the angle A is 45°, as cot A = cos A/sin A = 1 when both are equal.
Correct Answer: A — 45°
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Q. If cot D = 3/4, what is the value of sin D?
A.
3/5
B.
4/5
C.
5/3
D.
5/4
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Solution
cot D = 3/4 implies tan D = 4/3. Therefore, sin D = 4/5 (using the identity sin²D + cos²D = 1).
Correct Answer: A — 3/5
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Q. If D = [[4, 2], [1, 3]], find the inverse of D. (2022)
A.
[[3, -2], [-1, 4]]
B.
[[3, 2], [-1, 4]]
C.
[[3, -2], [1, 4]]
D.
[[4, -2], [-1, 3]]
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Solution
The inverse of D is given by (1/det(D)) * adj(D). Here, det(D) = (4*3) - (2*1) = 10, and adj(D) = [[3, -2], [-1, 4]]. Thus, D^(-1) = (1/10) * [[3, -2], [-1, 4]].
Correct Answer: A — [[3, -2], [-1, 4]]
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Q. If F = [[1, 2], [2, 4]], what is the determinant of F? (2021)
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Solution
The determinant of F is calculated as (1*4) - (2*2) = 4 - 4 = 0.
Correct Answer: A — 0
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Q. If f(x) = 3x + 2, what is the value of f(1) and is it continuous?
A.
5, Continuous
B.
5, Not Continuous
C.
3, Continuous
D.
3, Not Continuous
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Solution
f(1) = 3(1) + 2 = 5. Since f(x) is a linear function, it is continuous everywhere.
Correct Answer: A — 5, Continuous
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Q. If f(x) = e^x, what is f''(x)? (2020)
A.
e^x
B.
xe^x
C.
2e^x
D.
0
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Solution
The second derivative f''(x) = d^2/dx^2(e^x) = e^x.
Correct Answer: A — e^x
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Q. If f(x) = e^x, what is the value of f''(0)? (2021)
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Solution
f'(x) = e^x and f''(x) = e^x. Therefore, f''(0) = e^0 = 1.
Correct Answer: A — 1
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Q. If f(x) = x^2 + 3x + 2, what is the limit as x approaches -1?
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Solution
lim x→-1 f(x) = (-1)^2 + 3(-1) + 2 = 1 - 3 + 2 = 0.
Correct Answer: C — 2
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Q. If f(x) = x^3 - 3x + 2, what is the value of f(1) and is it continuous?
A.
0, Continuous
B.
0, Not Continuous
C.
1, Continuous
D.
1, Not Continuous
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Solution
f(1) = 1^3 - 3(1) + 2 = 0. Since f(x) is a polynomial, it is continuous everywhere.
Correct Answer: A — 0, Continuous
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Q. If f(x) = x^3 - 3x^2 + 4, what is f'(2)? (2020)
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Solution
First, find f'(x) = 3x^2 - 6x. Then, f'(2) = 3(2^2) - 6(2) = 12 - 12 = 0.
Correct Answer: A — 0
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Q. If f(x) = x^3 - 6x^2 + 9x, find the inflection point. (2023)
A.
(1, 4)
B.
(2, 0)
C.
(3, 0)
D.
(0, 0)
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Solution
Find f''(x) = 6x - 12. Set f''(x) = 0 gives x = 2. The inflection point is (2, f(2)) = (2, 0).
Correct Answer: B — (2, 0)
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Q. If f(x) = x^4 - 4x^3, find f'(2). (2023)
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Solution
f'(x) = 4x^3 - 12x^2; thus, f'(2) = 4(2^3) - 12(2^2) = 32 - 48 = -16.
Correct Answer: C — 16
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Q. If h(x) = e^(2x), what is h'(x)? (2019)
A.
2e^(2x)
B.
e^(2x)
C.
2xe^(2x)
D.
e^(x)
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Solution
Using the chain rule, h'(x) = 2e^(2x).
Correct Answer: A — 2e^(2x)
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Q. If I = [[1, 1], [1, 1]], what is the rank of I? (2022)
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Solution
The rank of I is 1 because all rows are linearly dependent.
Correct Answer: B — 1
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Q. If it is 12:00 noon at the Prime Meridian (0 degrees longitude), what time is it at 45 degrees East longitude? (2020)
A.
6:00 AM
B.
12:00 PM
C.
6:00 PM
D.
3:00 PM
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Solution
At 45 degrees East, it is 45/15 = 3 hours ahead. Therefore, it is 12:00 PM + 3 hours = 3:00 PM.
Correct Answer: C — 6:00 PM
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Q. If it is 12:00 noon at the Prime Meridian (0° longitude), what time is it at 75°W longitude?
A.
6:00 AM
B.
7:00 AM
C.
8:00 AM
D.
9:00 AM
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Solution
Each degree of longitude represents 4 minutes of time. 75°W = 75 * 4 = 300 minutes = 5 hours. Therefore, it is 12:00 noon - 5 hours = 7:00 AM.
Correct Answer: C — 8:00 AM
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Q. If it is 3:00 PM in New Delhi (77°E), what time is it in London (0° longitude)?
A.
8:30 AM
B.
9:30 AM
C.
10:30 AM
D.
11:30 AM
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Solution
New Delhi is 77°E, which is 77 * 4 = 308 minutes = 5 hours and 8 minutes ahead of GMT. Therefore, 3:00 PM - 5:08 = 9:30 AM.
Correct Answer: B — 9:30 AM
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Q. If it is 3:00 PM in New York (GMT-5), what time is it in London (GMT+0)? (2022)
A.
8:00 AM
B.
10:00 AM
C.
12:00 PM
D.
3:00 PM
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Solution
New York is 5 hours behind London, so 3:00 PM + 5 hours = 8:00 PM in London.
Correct Answer: B — 10:00 AM
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Q. If log_2(x) + log_2(4) = 6, what is the value of x?
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Solution
log_2(x) + 2 = 6 implies log_2(x) = 4, so x = 2^4 = 16.
Correct Answer: C — 32
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Q. If log_3(x) = 4, what is the value of x?
A.
27
B.
81
C.
243
D.
729
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Solution
log_3(x) = 4 implies x = 3^4 = 81.
Correct Answer: C — 243
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Q. If log_4(256) = x, what is the value of x? (2022)
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Solution
log_4(256) = log_4(4^4) = 4.
Correct Answer: D — 8
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Q. If log_a(16) = 4, what is the value of a? (2021)
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Solution
log_a(16) = 4 implies a^4 = 16. Since 16 = 2^4, we have a^4 = 2^4, thus a = 2.
Correct Answer: A — 2
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Q. If log_b(25) = 2, what is the value of b?
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Solution
log_b(25) = 2 implies b^2 = 25. Therefore, b = 5.
Correct Answer: A — 5
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Q. If log_x(64) = 6, what is the value of x? (2023)
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Solution
log_x(64) = 6 implies x^6 = 64. Since 64 = 2^6, we have x = 2.
Correct Answer: C — 8
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Q. If one root of the quadratic equation x^2 + px + q = 0 is 3, and the other root is -1, what is the value of p? (2021)
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Solution
The sum of the roots is 3 + (-1) = 2, hence p = -2.
Correct Answer: A — 2
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Q. If sin A = 1/√2, what is the value of tan A?
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Solution
tan A = sin A / cos A = (1/√2) / (1/√2) = 1.
Correct Answer: A — 1
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Q. If sin C = 0.8, what is the value of cos C?
A.
0.6
B.
0.8
C.
0.4
D.
0.2
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Solution
Using the Pythagorean identity, cos C = √(1 - sin²C) = √(1 - 0.8²) = √(1 - 0.64) = √(0.36) = 0.6.
Correct Answer: A — 0.6
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Q. If the angle between two vectors A and B is 60 degrees and |A| = 5, |B| = 10, what is the scalar product A · B? (2020)
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Solution
A · B = |A||B|cos(60°) = 5 * 10 * 0.5 = 25
Correct Answer: B — 30
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