Q. What is the characteristic polynomial of the matrix A = [[1, 2], [3, 4]]?
A.
λ^2 - 5λ - 2
B.
λ^2 - 5λ + 2
C.
λ^2 + 5λ + 2
D.
λ^2 + 5λ - 2
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Solution
The characteristic polynomial is det(A - λI) = det([[1-λ, 2], [3, 4-λ]]) = (1-λ)(4-λ) - 6 = λ^2 - 5λ + 2.
Correct Answer: B — λ^2 - 5λ + 2
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Q. What is the characteristic polynomial of the matrix A = [[2, 1], [1, 2]]?
A.
λ^2 - 3λ + 3
B.
λ^2 - 3λ + 1
C.
λ^2 - 5λ + 2
D.
λ^2 - 2λ + 1
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Solution
The characteristic polynomial is given by det(A - λI) = det([[2-λ, 1], [1, 2-λ]]) = (2-λ)(2-λ) - 1 = λ^2 - 3λ + 3.
Correct Answer: B — λ^2 - 3λ + 1
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Q. What is the circumradius of a triangle with sides 5, 12, and 13?
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Solution
For a right triangle, the circumradius R = hypotenuse/2 = 13/2 = 6.5.
Correct Answer: B — 7
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Q. What is the circumradius of a triangle with sides 6, 8, and 10?
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Solution
Circumradius R = (abc)/(4K), where K is the area. Area K = 24 (using Heron's formula). R = (6*8*10)/(4*24) = 5.
Correct Answer: A — 5
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Q. What is the circumradius of a triangle with sides 7, 24, and 25?
A.
12.5
B.
13
C.
14
D.
15
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Solution
The circumradius R of a triangle can be calculated using the formula R = (abc)/(4 * Area). Here, Area = 84 cm², so R = (7 * 24 * 25)/(4 * 84) = 13.
Correct Answer: B — 13
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Q. What is the circumradius of an equilateral triangle with side length a?
A.
a/√3
B.
a/2
C.
a/√2
D.
a/√3
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Solution
The circumradius R of an equilateral triangle is given by R = a/(√3).
Correct Answer: D — a/√3
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Q. What is the circumradius R of a triangle with sides a = 7, b = 24, c = 25?
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Solution
R = (abc) / (4 * Area). Area = 84, R = (7 * 24 * 25) / (4 * 84) = 12.
Correct Answer: A — 12
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Q. What is the circumradius R of a triangle with sides a, b, c?
A.
abc/4A
B.
A/(abc)
C.
2A/(a+b+c)
D.
a+b+c/2
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Solution
The circumradius R of a triangle is given by the formula R = abc/(4A), where A is the area of the triangle.
Correct Answer: A — abc/4A
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Q. What is the coefficient of static friction if a block on a horizontal surface begins to slide at a force of 20 N and the normal force is 50 N?
A.
0.2
B.
0.4
C.
0.5
D.
0.6
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Solution
The coefficient of static friction (μs) is given by μs = F/N, where F is the force and N is the normal force. Here, μs = 20 N / 50 N = 0.4.
Correct Answer: B — 0.4
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Q. What is the coefficient of variation if the mean is 50 and the standard deviation is 10?
A.
20%
B.
10%
C.
15%
D.
25%
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Solution
Coefficient of variation = (Standard deviation / Mean) * 100 = (10 / 50) * 100 = 20%.
Correct Answer: A — 20%
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Q. What is the coefficient of variation if the mean is 50 and the standard deviation is 5?
A.
5%
B.
10%
C.
15%
D.
20%
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Solution
Coefficient of Variation = (Standard Deviation / Mean) * 100 = (5 / 50) * 100 = 10%.
Correct Answer: B — 10%
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Q. What is the coefficient of x^0 in the expansion of (3x - 4)^5?
A.
-1024
B.
243
C.
-243
D.
1024
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Solution
The coefficient of x^0 is (-4)^5 = -1024.
Correct Answer: A — -1024
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Q. What is the coefficient of x^0 in the expansion of (x + 5)^3?
A.
125
B.
100
C.
75
D.
50
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Solution
The coefficient of x^0 is C(3,0) * 5^3 = 1 * 125 = 125.
Correct Answer: A — 125
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Q. What is the coefficient of x^0 in the expansion of (x + 5)^5?
A.
3125
B.
625
C.
125
D.
25
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Solution
The coefficient of x^0 is C(5,0) * 5^5 = 1 * 3125 = 3125.
Correct Answer: A — 3125
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Q. What is the coefficient of x^2 in the expansion of (3x - 4)^4?
A.
144
B.
216
C.
432
D.
576
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Solution
The coefficient of x^2 is C(4,2) * (3)^2 * (-4)^2 = 6 * 9 * 16 = 864.
Correct Answer: C — 432
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Q. What is the coefficient of x^2 in the expansion of (x - 4)^6?
A.
240
B.
360
C.
480
D.
720
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Solution
Using the binomial theorem, the coefficient of x^2 in (a + b)^n is given by nCk * a^(n-k) * b^k. Here, n=6, a=x, b=-4, and k=2. Thus, the coefficient is 6C2 * (1)^4 * (-4)^2 = 15 * 16 = 240.
Correct Answer: B — 360
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Q. What is the coefficient of x^3 in the expansion of (2x + 3)^5?
A.
90
B.
100
C.
120
D.
150
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Solution
Using the binomial theorem, the coefficient of x^3 is given by C(5,3) * (2)^3 * (3)^(5-3) = 10 * 8 * 9 = 720.
Correct Answer: A — 90
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Q. What is the coefficient of x^4 in the expansion of (2x + 3)^6?
A.
540
B.
720
C.
810
D.
960
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Solution
The coefficient of x^4 is C(6,4) * (2)^4 * (3)^(6-4) = 15 * 16 * 9 = 2160.
Correct Answer: C — 810
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Q. What is the coefficient of x^4 in the expansion of (2x - 3)^5?
A.
240
B.
300
C.
360
D.
420
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Solution
The coefficient of x^4 is C(5, 4) * (2)^4 * (-3)^1 = 5 * 16 * (-3) = -240.
Correct Answer: C — 360
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Q. What is the coefficient of x^4 in the expansion of (x + 1)^6?
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Solution
The coefficient of x^4 is C(6,4) = 15.
Correct Answer: D — 35
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Q. What is the coefficient of x^5 in the expansion of (x + 1/2)^10?
A.
252
B.
210
C.
120
D.
300
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Solution
The coefficient of x^5 is C(10,5) * (1/2)^5 = 252 * 1/32 = 7.875.
Correct Answer: A — 252
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Q. What is the coefficient of x^5 in the expansion of (x + 2)^7?
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Solution
The coefficient of x^5 is C(7,5)(2)^2 = 21 * 4 = 84.
Correct Answer: C — 35
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Q. What is the coefficient of x^5 in the expansion of (x + 2)^8?
A.
672
B.
1280
C.
960
D.
720
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Solution
The coefficient of x^5 is C(8,5) * (2)^3 = 56 * 8 = 448.
Correct Answer: A — 672
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Q. What is the coefficient of x^5 in the expansion of (x + 3)^8?
A.
1680
B.
1440
C.
1260
D.
1080
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Solution
Using the binomial theorem, the coefficient of x^5 in (x + 3)^8 is given by 8C5 * (3)^3 = 56 * 27 = 1512.
Correct Answer: A — 1680
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Q. What is the coefficient of x^6 in the expansion of (x + 5)^8?
A.
6720
B.
5600
C.
4480
D.
3360
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Solution
The coefficient of x^6 is C(8,6) * (5)^2 = 28 * 25 = 700.
Correct Answer: A — 6720
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Q. What is the color of the complex ion [Cu(H2O)6]2+?
A.
Blue
B.
Green
C.
Yellow
D.
Red
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Solution
The complex ion [Cu(H2O)6]2+ is blue due to d-d transitions.
Correct Answer: A — Blue
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Q. What is the color of the complex [Cu(H2O)6]2+?
A.
Blue
B.
Green
C.
Red
D.
Yellow
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Solution
[Cu(H2O)6]2+ is known to exhibit a blue color due to d-d transitions in the presence of water ligands.
Correct Answer: A — Blue
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Q. What is the combined gas law equation?
A.
PV = nRT
B.
P1V1/T1 = P2V2/T2
C.
P1V1 = P2V2
D.
V1/T1 = V2/T2
Show solution
Solution
The combined gas law is represented by the equation P1V1/T1 = P2V2/T2, which combines Boyle's, Charles's, and Gay-Lussac's laws.
Correct Answer: B — P1V1/T1 = P2V2/T2
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Q. What is the common oxidation state of actinides in their compounds?
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Solution
The common oxidation state of actinides in their compounds is +4.
Correct Answer: D — +6
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Q. What is the common oxidation state of alkali metals?
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Solution
Alkali metals have a common oxidation state of +1.
Correct Answer: A — +1
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