Q. If z = -3 + 4i, what is the real part of z?
Solution
The real part of a complex number z = a + bi is a. Here, the real part is -3.
Correct Answer:
A
— -3
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Q. If z = 1 + i, find |z|².
Solution
|z|² = (1)² + (1)² = 1 + 1 = 2.
Correct Answer:
B
— 2
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Q. If z = 1 + i, what is the argument of z?
Solution
The argument of a complex number z = a + bi is given by θ = tan⁻¹(b/a). Here, θ = tan⁻¹(1/1) = π/4.
Correct Answer:
A
— π/4
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Q. If z = 1 + i, what is the value of z^3? (2023)
-
A.
-2 + 2i
-
B.
2i
-
C.
0
-
D.
2 + 2i
Solution
z^3 = (1 + i)^3 = 1 + 3i + 3i^2 + i^3 = 1 + 3i - 3 - i = -2 + 2i.
Correct Answer:
A
— -2 + 2i
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Q. If z = 1 + i√3, find the conjugate of z.
-
A.
1 - i√3
-
B.
1 + i√3
-
C.
1 + √3i
-
D.
1 - √3i
Solution
The conjugate of a complex number z = a + bi is given by z* = a - bi. Thus, the conjugate of z = 1 + i√3 is 1 - i√3.
Correct Answer:
A
— 1 - i√3
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Q. If z = 1 + i√3, what is the value of z^2? (2023)
-
A.
-2 + 2i√3
-
B.
4
-
C.
1 - 2i√3
-
D.
1 + 2i√3
Solution
z^2 = (1 + i√3)^2 = 1^2 + 2(1)(i√3) + (i√3)^2 = 1 + 2i√3 - 3 = -2 + 2i√3.
Correct Answer:
A
— -2 + 2i√3
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Q. If z = 1 + √3i, what is the square of the modulus of z?
Solution
The modulus of z = 1 + √3i is |z| = √(1² + (√3)²) = √(1 + 3) = √4 = 2. The square of the modulus is 2² = 4.
Correct Answer:
A
— 4
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Q. If z = 2 + 2i, find z².
-
A.
0
-
B.
8i
-
C.
8
-
D.
4 + 8i
Solution
z² = (2 + 2i)² = 4 + 8i - 4 = 8i.
Correct Answer:
C
— 8
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Q. If z = 2 + 2i, what is the argument of z? (2023)
-
A.
π/4
-
B.
π/2
-
C.
3π/4
-
D.
0
Solution
The argument of z is given by tan^(-1)(2/2) = tan^(-1)(1) = π/4.
Correct Answer:
A
— π/4
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Q. If z = 2 + 2i, what is the value of z^3? (2022)
Solution
z^3 = (2 + 2i)^3 = 8 + 12i - 12 - 8i = 8.
Correct Answer:
C
— 8
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Q. If z = 2(cos(π/3) + i sin(π/3)), what is z in rectangular form? (2022)
-
A.
1 + √3i
-
B.
2 + √3i
-
C.
1 + 2i
-
D.
2 + 2i
Solution
Using Euler's formula, z = 2(cos(π/3) + i sin(π/3)) = 2(1/2 + i√3/2) = 1 + √3i.
Correct Answer:
A
— 1 + √3i
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Q. If z = 3 + 4i, what is the modulus of z? (2021)
Solution
The modulus of z is given by |z| = √(3^2 + 4^2) = √(9 + 16) = √25 = 5.
Correct Answer:
A
— 5
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Q. If z = 4 - 3i, find the conjugate of z. (2023)
-
A.
4 + 3i
-
B.
4 - 3i
-
C.
-4 + 3i
-
D.
-4 - 3i
Solution
The conjugate of z = 4 - 3i is z* = 4 + 3i.
Correct Answer:
A
— 4 + 3i
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Q. If z = 4e^(iπ/3), find the rectangular form of z.
-
A.
2 + 2√3i
-
B.
4 + 0i
-
C.
0 + 4i
-
D.
4 + 4i
Solution
z = 4(cos(π/3) + i sin(π/3)) = 4(1/2 + i√3/2) = 2 + 2√3i.
Correct Answer:
A
— 2 + 2√3i
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Q. If z = 5 + 12i, find the argument of z. (2020)
-
A.
arctan(12/5)
-
B.
arctan(5/12)
-
C.
π/2
-
D.
0
Solution
The argument of z = 5 + 12i is θ = arctan(12/5).
Correct Answer:
A
— arctan(12/5)
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Q. If z = 5(cos(θ) + i sin(θ)), what is the value of z when θ = π/3? (2023)
-
A.
5 + 5i
-
B.
5 + 2.5i
-
C.
2.5 + 5i
-
D.
2.5 + 2.5i
Solution
z = 5(cos(π/3) + i sin(π/3)) = 5(1/2 + i√3/2) = 2.5 + 5i√3/2.
Correct Answer:
B
— 5 + 2.5i
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Q. If z1 = 2 + 2i and z2 = 1 - i, find z1 + z2.
-
A.
3 + i
-
B.
1 + i
-
C.
3 - i
-
D.
1 - i
Solution
z1 + z2 = (2 + 2i) + (1 - i) = 3 + i.
Correct Answer:
A
— 3 + i
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Q. If z1 = 2 + 2i and z2 = 2 - 2i, what is the value of z1 * z2? (2019)
Solution
z1 * z2 = (2 + 2i)(2 - 2i) = 4 - 4i^2 = 4 + 4 = 8.
Correct Answer:
A
— 8
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Q. If z1 = 2 + 2i and z2 = 3 - i, find z1 + z2. (2023)
-
A.
5 + i
-
B.
5 + 3i
-
C.
1 + i
-
D.
1 - i
Solution
z1 + z2 = (2 + 2i) + (3 - i) = 5 + i.
Correct Answer:
A
— 5 + i
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Q. If \( C = \begin{pmatrix} 1 & 0 & 2 \\ 0 & 1 & 3 \\ 0 & 0 & 1 \end{pmatrix} \), what is the determinant of C? (2022)
Solution
The determinant of an upper triangular matrix is the product of its diagonal elements: 1 * 1 * 1 = 1.
Correct Answer:
B
— 1
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Q. If \( G = \begin{pmatrix} 0 & 2 & 1 \\ 1 & 0 & 3 \\ 4 & 1 & 0 \end{pmatrix} \), what is the determinant of G? (2020)
Solution
Det(G) = 0 because the first column has a zero entry, leading to a linear dependence.
Correct Answer:
A
— -10
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Q. In 2023, which country announced a plan to phase out coal by 2030? (2023)
-
A.
India
-
B.
Germany
-
C.
Australia
-
D.
South Africa
Solution
Germany announced a plan to phase out coal by 2030 in 2023.
Correct Answer:
B
— Germany
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Q. In 2023, which country became the first to achieve 100% renewable energy? (2023)
-
A.
Germany
-
B.
Denmark
-
C.
Costa Rica
-
D.
Iceland
Solution
Costa Rica became the first country to achieve 100% renewable energy in 2023.
Correct Answer:
C
— Costa Rica
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Q. In 2023, which country hosted the G20 summit? (2023)
-
A.
India
-
B.
Italy
-
C.
Indonesia
-
D.
Germany
Solution
India hosted the G20 summit in 2023, focusing on global economic recovery.
Correct Answer:
A
— India
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Q. In 2023, which country was the first to achieve 100% renewable energy for a full day? (2023)
-
A.
Germany
-
B.
Denmark
-
C.
Costa Rica
-
D.
Iceland
Solution
Denmark achieved 100% renewable energy for a full day in 2023.
Correct Answer:
B
— Denmark
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Q. In 2023, which country was the largest producer of solar energy? (2023)
-
A.
USA
-
B.
Germany
-
C.
China
-
D.
India
Solution
China remains the largest producer of solar energy in 2023.
Correct Answer:
C
— China
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Q. In 2023, which Indian city was ranked as the most polluted city in the world? (2023)
-
A.
Delhi
-
B.
Mumbai
-
C.
Kolkata
-
D.
Bengaluru
Solution
Delhi was ranked as the most polluted city in the world in 2023.
Correct Answer:
A
— Delhi
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Q. In 2023, which Indian company became the first to reach a market capitalization of $200 billion? (2023)
-
A.
Reliance Industries
-
B.
Tata Consultancy Services
-
C.
Infosys
-
D.
HDFC Bank
Solution
Reliance Industries became the first Indian company to reach a market capitalization of $200 billion in 2023.
Correct Answer:
A
— Reliance Industries
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Q. In 2023, which Indian sportsperson won a gold medal at the World Athletics Championships? (2023)
-
A.
Neeraj Chopra
-
B.
P.V. Sindhu
-
C.
Mary Kom
-
D.
Saina Nehwal
Solution
Neeraj Chopra won a gold medal at the World Athletics Championships in 2023.
Correct Answer:
A
— Neeraj Chopra
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Q. In 2023, which organization announced a new climate change initiative? (2023)
-
A.
UNESCO
-
B.
WHO
-
C.
UNEP
-
D.
IMF
Solution
The United Nations Environment Programme (UNEP) announced a new climate change initiative in 2023.
Correct Answer:
C
— UNEP
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