Defence Exams

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Q. Which of the following lines is parallel to the line 3x - 4y + 5 = 0?
  • A. 6x - 8y + 10 = 0
  • B. 4x + 3y - 7 = 0
  • C. 3x + 4y - 5 = 0
  • D. 2x - 3y + 1 = 0
Q. Which of the following longitudes is closest to the International Date Line?
  • A. 150°E
  • B. 180°
  • C. 150°W
  • D. 120°W
Q. Which of the following materials has the highest speed of sound?
  • A. Air
  • B. Water
  • C. Steel
  • D. Wood
Q. Which of the following materials is the best conductor of sound?
  • A. Air
  • B. Water
  • C. Steel
  • D. Wood
Q. Which of the following materials would sound travel fastest through? (2019)
  • A. Air
  • B. Water
  • C. Steel
  • D. Wood
Q. Which of the following matrices is a diagonal matrix? (2023)
  • A. [[1, 0], [0, 2]]
  • B. [[1, 2], [3, 4]]
  • C. [[0, 1], [1, 0]]
  • D. [[1, 1], [1, 1]]
Q. Which of the following matrices is a zero matrix? (2022)
  • A. [[0, 0], [0, 0]]
  • B. [[1, 0], [0, 1]]
  • C. [[1, 2], [3, 4]]
  • D. [[0, 1], [1, 0]]
Q. Which of the following matrices is an identity matrix? (2023)
  • A. [[1, 0], [0, 1]]
  • B. [[0, 1], [1, 0]]
  • C. [[1, 1], [1, 1]]
  • D. [[0, 0], [0, 0]]
Q. Which of the following matrices is an orthogonal matrix? (2021)
  • A. A matrix whose transpose is equal to its inverse
  • B. A matrix with all elements equal
  • C. A matrix with only one row
  • D. A matrix with all diagonal elements equal
Q. Which of the following matrices is not invertible? (2019)
  • A. [[1, 2], [3, 4]]
  • B. [[0, 1], [0, 0]]
  • C. [[5, 6], [7, 8]]
  • D. [[9, 10], [11, 12]]
Q. Which of the following matrices is symmetric? (2023)
  • A. A = [[1, 2], [3, 4]]
  • B. B = [[1, 2], [2, 1]]
  • C. C = [[1, 0], [0, 1]]
  • D. D = [[1, 2, 3], [4, 5, 6]]
Q. Which of the following metals is known for its resistance to corrosion? (2019)
  • A. Iron
  • B. Copper
  • C. Aluminum
  • D. Gold
Q. Which of the following metals is known to be the least reactive?
  • A. Gold
  • B. Sodium
  • C. Potassium
  • D. Calcium
Q. Which of the following metals is known to be the most malleable?
  • A. Iron
  • B. Gold
  • C. Lead
  • D. Copper
Q. Which of the following metals is known to react vigorously with water? (2022)
  • A. Iron
  • B. Sodium
  • C. Copper
  • D. Lead
Q. Which of the following metals is known to react with water at room temperature? (2019)
  • A. Iron
  • B. Sodium
  • C. Copper
  • D. Gold
Q. Which of the following metals is liquid at room temperature? (2023)
  • A. Mercury
  • B. Lead
  • C. Tin
  • D. Bismuth
Q. Which of the following metals is most reactive? (2019)
  • A. Gold
  • B. Silver
  • C. Sodium
  • D. Copper
Q. Which of the following metals is the best conductor of electricity?
  • A. Copper
  • B. Aluminum
  • C. Gold
  • D. Silver
Q. Which of the following metals is used in making aircraft due to its lightweight? (2020)
  • A. Lead
  • B. Aluminum
  • C. Iron
  • D. Copper
Q. Which of the following metals is used in making alloys?
  • A. Mercury
  • B. Tin
  • C. Bismuth
  • D. Lead
Q. Which of the following metals is used in making electrical wires?
  • A. Zinc
  • B. Copper
  • C. Aluminum
  • D. Iron
Q. Which of the following metals reacts vigorously with water?
  • A. Copper
  • B. Sodium
  • C. Iron
  • D. Gold
Q. Which of the following mountain ranges is located in India?
  • A. Andes
  • B. Himalayas
  • C. Rockies
  • D. Alps
Q. Which of the following non-metals is a gas at room temperature?
  • A. Phosphorus
  • B. Sulfur
  • C. Chlorine
  • D. Carbon
Q. Which of the following non-metals is a good insulator? (2023)
  • A. Graphite
  • B. Sulfur
  • C. Phosphorus
  • D. Diamond
Q. Which of the following non-metals is a key component of DNA?
  • A. Oxygen
  • B. Nitrogen
  • C. Carbon
  • D. Hydrogen
Q. Which of the following non-metals is used in fertilizers?
  • A. Nitrogen
  • B. Oxygen
  • C. Helium
  • D. Argon
Q. Which of the following numbers is a perfect square?
  • A. 10
  • B. 15
  • C. 25
  • D. 30
Q. Which of the following points lies on the parabola y = x^2 - 4?
  • A. (2, 0)
  • B. (0, -4)
  • C. (1, -3)
  • D. (3, 5)
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