MCQ in Plane Trigonometry Part 2 | ECE Board Exam Practice

Multiple Choice Questions in Plane Trigonometry – Part 2 | ECE Board Exam Practice

You made it to Part 2. That already says something about how serious you are with your review. This continuation of the Plane Trigonometry MCQ Series goes deeper into one of the most frequently tested topics in the Engineering Mathematics section of the ECE Board Exam. Each question here was pulled from past board exam problems, engineering mathematics books, academic journals, and other reliable references. The same sources that have helped countless ECE reviewees pass.

Work through every item with intention. It’s easy to rush through multiple choice questions, but the ones who pass are usually the ones who slow down, think it through, and actually understand the concept behind each answer.

If you haven’t gone through Part 1 yet, it’s worth starting there. But if you’re ready, then you can start, for every question you practice today is one less surprise on exam day.

Multiple Choice Questions Topic Outline

MCQs in Trigonometry | MCQs in Solution to Right Triangles | MCQs in Pythagorean Theorem | MCQs in Solution to Oblique Triangles | MCQs in Law of Sines | MCQs in Law of Cosines | MCQs in Law of Tangents | MCQs in Trigonometric Identities | MCQs in Plane Areas (Triangles) | MCQs in Plane Areas (Quadrilaterals) | MCQs in Ptolemy’s Theorem

Continue Practice Exam Test Questions Part 2 of the Series

Choose the letter of the best answer in each question.

51. Find the supplement of an angle whose complement is 62°.

A. 28°

B. 118°

C. 152°

D. None of these

52. A certain angle has a supplement 5 times its complement. Find the angle.

A. 67.5°

B. 157.5°

C. 168.5°­­­

D. 186°

53. The sum of the two interior angles of the triangle is equal to the third angle and the difference of the two angles is equal to 2/3 of the third angle. Find the third angle.

A. 15°

B. 75°

C. 90°

D. 120°

54. The measure 0f 1 ½ revolutions counter-clockwise is:

A. 540°

B. 520°

C. +90°

D. -90°

55. The measure of 2.25 revolutions counterclockwise is:

A. -835°

B. -810°

C. 805°

D. 810°

56. Solve for θ: sin θ – sec θ + csc θ – tan 2θ = –0.0866 

A. 40°

B. 41°

C. 47°

D. 43°

57. What are the exact values of the cosine and tangent trigonometric functions of acute angle A, given that sin A = 3/7?

58. Given three angles A, B, and C whose sum is 180°. If the tan A + tan B + tan C = x, find the value of tan A x tan B x tan C.

A. 1 – x

B. √x

C. x/2

D. x

59. What is the sine of 820°?

A. 0.984

B. -0.866

C. 0.866

D. -0.500

60. csc 270° = ?

A. -√3

B. -1

C. √3

D. 1

61. If coversine Ѳ is 0.134, find the value of Ѳ.

A. 60°

B. 45°

C. 30°

D. 20°

62. Solve for cos 72° if the given relationship is cos 2A = 2 cos²  A – 1.

A. 0.309

B. 0.258

C. 0.268

D. 0.315

63. If sin 3A = cos 6B then:

A. A + B = 180°

B. A + 2B = 30°

C. A – 2B = 30°

D. A + B = 30°

64. Find the value of sin (arcos 15/17).

A. 8/17

B. 17/9

C. 8/21

D. 8/9

65. Find the value of cos [arcsin (1/3) + arctan (2/√5)]

66. If sin 40° + sin 20° = sin Ѳ, find the value of Ѳ.

A. 20°

B. 80°

C. 120°

D. 60°

67. How many different value of x from 0° to 180° for the equation (2sin x – 1)(cos x + 1) = 0?

A. 3

B. 0

C. 1

D. 2

68. For what value of Ѳ (less than 2π) will the following equation be satisfied?

sin² Ѳ + 4sinѲ + 3 = 0

A. π

B. π/4

C. 3π/2

D. π/2

69. Find the value of x in the equation csc x + cot x = 3.

A. π/4

B. π/3

C. π/2

D. π/5

70. If sec² A  is 5/2, the quantity 1 – sin² A is equivalent to:

A. 2.5

B. 0.6

C. 1.5

D. 0.4

71. Find sin x if 2sin x + 3cos x – 2 = 0.

A. 1 & -5/13

B. -1 & 5/13

C. 1 & 5/13

D. -1 & -5/13

72. If sin A = 4/5, A in quadrant II, sin B = 7/25, B in quadrant I, find sin (A + B).

A. 3/5

B. 2/5

C. 3/4

D. 4/5

73. If sin A = 2.571x, cos A = 3.06, and sin 2A = 3.939x, find the value of x.

A. 0.350

B. 0.250

C. 0.100

D. 0.150

74. If cos Ѳ = √3/2, what is the value of x if x = 1 – tan² Ѳ.

A. -2

B. -1/3

C. 4/3

D. 2/3

75. If sin Ѳ – cos Ѳ = -1/3, what is the value of sin 2Ѳ?

A. 1/3

B. 1/9

C. 8/9

D. 4/9

76. If x cos Ѳ + y sin Ѳ = 1 and x sin Ѳ – y cos Ѳ = 3, what is the relationship between x and y?

A.  x² + y² = 20

B. x² – y² = 5

C. x² + y² = 16

D. x² + y² = 10

77. If sin x + 1/sin x = √2  , then sin² x + 1/sin² x is equal to:

A. √2

B. 1

C. 2

D. 0

78. The equation 2sin Ѳ + 2cos Ѳ – 1 = √3 is:

A. An identity

B. A parametric equation

C. A conditional equation

D. A quadratic equation

79. If x + y = 90°, then ((sin x tan y)/(sin y tan x))  is equal to:

A. tan x

B. cos x

C. cot x

D. sin x

80. If cos Ѳ = x/2 then 1 – tan² Ѳ  is equal to:

A. (2x² + 4)/x²

B. (4 – 2x²)/x²

C. (2x² – 4)/x

D. (2x² – 4)/x²

81. Find the value in degrees of arcos (tan 24°).

A. 61.48

B. 62.35

C. 63.56

D. 60.84

82. arctan [2 cos (arcsin (√3/2))] is equal to:

A. π/3

B. π/4

C. π/6

D. π/2

83. Solve for x in the equation: arctan (2x) + arctan (x) = π/4

A. 0.821

B. 0.218

C. 0.281

D. 0.182

84. Solve for x from the given trigonometric equation:

arctan (1 – x) + arctan (1 + x) = arctan 1/8

A. 4

B. 6

C. 8

D. 2

85. Solve for y if y = (1/sin x – 1/tan x)(1 + cos x)

A. sin x

B. cos x

C. tan x

D. sec² x

86. Solve for x: x = (tan θ + cot θ)² sin² θ – tan² θ.

A. sin θ

B. cos θ

C. 1

D. 2

87. Solve for x: x = 1 – (sin θ – cos θ)²

A. sin θ cos θ

B. -2 cos θ

C. cos 2θ

D. sin 2θ

88. Simplify cos⁴ θ – sin⁴ θ 

A. 2

B. 1

C. 2 sin2 θ + 1

D. 2 cos2 θ – 1 

89. Solve for x: x = ((1 – tan² a)/(1 + tan² a))

A. cos a

B. sin 2a

C. cos 2a

D. sin a

90. which of the following is different from the others?

A. 2 cos 2x – 1

B. cos 4x – sin 4x

C. cos 3x – sin 3x

D. 1 – 2 sin 2x

91. Find the value of y: y = (1 + cos 2θ) tan θ.

A. cos θ

B. sin θ

C. sin 2θ

D. cos 2θ

92. The equation 2sinh x cosh x is equal to:

A. e^x 

B. e^-x

C. sinh 2x

D. cosh 2x

93. Simplifying the equation sin² θ(1 + cot² θ)

A. 1

B. sin² θ

C. sin² θ sec² θ

D. sin² θ

94. If tan θ = x², which of the following is incorrect?

A. sin θ = 1/√(1 + x⁴)

B. sec θ = √(1 + x⁴) 

C. cos θ = 1/√(1 + x⁴) 

D. csc θ = √(1 + x⁴) / x²

95. In an isosceles right triangle, the hypotenuse is how much longer than its sides?

A. 2 times

B. √2 times

C. 1.5 times

D. None of these

96. Find the angle in mils subtended by a line 10 yards long at a distance of 5000 yards.

A. 2.5 mils

B. 2 mils

C. 4 mils

D. 1 mil

97. The angle or inclination of ascend of a road having 8.25% grade is _____degrees.

A. 5.12 degrees

B. 4.72 degrees

C. 1.86 degrees

D. 4.27 degrees

98. The sides of a right triangle is in arithmetic progression whose common difference if 6 cm. its area is:

A. 216 cm² 

B. 270 cm²

C. 360 cm²

D. 144 cm²

99. Four holes are to be spaced regularly on a circle of radius 20 cm. Find the distance “d” between the centers of two successive holes.

A. 10√5

B. 20√2

C. 15√3

D. 25

100. A train travels 2.5 miles up on a straight track with a grade of 1°10′. What is the vertical rise of the train in that distance?

A. 0.032 miles

B. 0.042 miles

C. 0.051 miles

D. 0.068 miles

Online Questions and Answers in Plane Trigonometry Series

Following is the list of multiple choice questions in this brand new series:

Online Questions and Answers in Spherical Trigonometry

Mathematics Board Examination Mastery | Math Engineering Pre-Board