# Centroid/Centre of Gravity - Mechanical Engineering (MCQ) questions and answers

1)   What is the reaction acting on point Q, for the simply supported beam shown below? a. 5 N (↑)
b. 10 N (↑)
c. 10 N (↓)
d. 40 N (↓)
 Answer  Explanation ANSWER: 5 N (↑) Explanation: No explanation is available for this question!

2)   Which of the following laminas do not have centroid at its geometrical centre?

a. Circle
b. Equilateral triangle
c. Right angled triangle
d. None of the above
 Answer  Explanation ANSWER: Right angled triangle Explanation: No explanation is available for this question!

3)   What is the C.G of an isosceles triangle of base 20 cm and side 40?

a. 12.90 cm
b. 13.28 cm
c. 19.36 cm
d. 38.72 cm
 Answer  Explanation ANSWER: 12.90 cm Explanation: No explanation is available for this question!

4)   If a material has no uniform density throughout the body, then the position of centroid and center of mass are ________

a. identical
b. not identical
c. independent upon the density
d. unpredictable
 Answer  Explanation ANSWER: not identical Explanation: No explanation is available for this question!

5)   What is the centroidal distance along the line of symmetry XO for the quarter circle shown below?
(where D= 4r/3π) a. √(1/D)
b. √D
c. √2 (D)
d. √2 (D2)
 Answer  Explanation ANSWER: √2 (D) Explanation: No explanation is available for this question!

6)   What is the angle made by side of a square lamina, if it is freely suspended from a corner with the horizontal?

a. 0o
b. 45o
c. 90o
d. 180o
 Answer  Explanation ANSWER: 45o Explanation: No explanation is available for this question!

7)   Uniformly distributed load of 5 kN acts on a simply supported beam of length 10 m. What are the reactions at end points of the beam?

a. 12.5 kN
b. 25 kN
c. 50 kN
d. None of the above
 Answer  Explanation ANSWER: 25 kN Explanation: No explanation is available for this question!

8)   What is the centroidal distance of an equilateral triangle of side 2 m?

a. 0.866 m
b. 0.769 m
c. 1.000 m
d. 0.577 m
 Answer  Explanation ANSWER: 0.577 m Explanation: No explanation is available for this question!

9)   What is the distance of centroid with respect to diagonal shown in diagram below? a. a /√3
b. a /√2
c. a /√18
d. 3a /√2
 Answer  Explanation ANSWER: a /√18 Explanation: No explanation is available for this question!

10)   Which method is used to determine centroid of a composite figure?

a. Analytical method
b. Graphical method
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Both a. and b. Explanation: No explanation is available for this question!