NDA/NA SOLVED PAPER 2015-I (MATHEMATICS)

Total Questions: 120

71. Solve the following equation

Correct Answer: (a) x = 2, y = 1
Solution:

72. Solve the following equation

Correct Answer: (d) 2√10
Solution:

73. Solve the following equation

Correct Answer: (b) form an equilateral triangle
Solution:

74. Solve the following equation

Correct Answer: (c) Both 1 and 2
Solution:

75. Solve the following equation

Correct Answer: (c)
Solution:

76. Solve the following equation

Correct Answer: (a)
Solution:

77. Consider the following statements:


Correct Answer: (c) Both 1 and 2
Solution:



78. For each non-zero real number x, let f(x) = (x / |x|) The range of f is

Correct Answer: (c) a set consisting of two elements
Solution:




79. Consider the following statements:

1. f(x) = [x] where [.] is the greatest integer function, is discontinuous at x = n where n ∈ Z.
2. f(x) = cot x is discontinuous at x = nπ, where n ∈ Z.

which of the above statements is/are correct?

Correct Answer: (c) Both 1 and 2
Solution:




80. Solve the following equation

Correct Answer: (b) 1/2
Solution: