# MCQ in Engineering Mechanics Part 4 | ECE Board Exam

(Last Updated On: February 22, 2020) This is the Multiples Choice Questions Part 4 of the Series in Engineering Mechanics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS), Engineering Mechanics Books, Journals and other Engineering Mechanics References.

### Online Questions and Answers in Engineering Mechanics Series

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

Engineering Mechanics MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII

### Continue Practice Exam Test Questions Part IV of the Series

Choose the letter of the best answer in each questions.

151. Which of the following is an example of Newtonian fluid?

• A. oobleck
• B. pudding
• C. water
• D. paint

152. If an object is stationary or moving at a constant velocity, then

• A. no forces are acting on the object.
• B. the forces acting the object are balanced.
• C. the object is in equilibrium state.
• D. either of the above

153. It is an additional force that exactly balances a resultant force.

• A. reactant
• B. equilibrant
• C. buoyant
• D. reverse effective force

154. The equilibrant of the forces 10 N at 10° and 15 N at 100° is

• A.18 N at 246°
• B. 18 N at 66°
• C. 25 N at -114°
• D. 25 N at 66°

155. It is a point within an object from which the force of gravity appears to act

• A. center of gravity
• B. centroid
• C. center of mass
• D. all of the above are correct

156. If an area has one line of symmetry the centroid will

• A. lie somewhere along the line symmetry
• B. lie anywhere on the area
• C. lie in the midpoint of the line of symmetry
• D. not lie on the line of symmetry

157. The second moment of area is an important value which is used to __________. It can also be called moment of inertia.

• A. determine the state of stress in a section
• B. calculate the resistance to buckling
• C. determine the amount of deflection in a beam
• D. all of the above

158. The __________ transfers the moment of inertia of a section or area from its own centroidal axis to another parallel axis.

• A. moment of axis theorem
• B. transfer formula
• C. parallel axis theorem
• D. B or C

159. The moment of force is zero when

• A. the applied force is zero
• B. the force is applied at the moment axis
• C. the line of action of the force is parallel to the moment axis
• D. all of the above

160. The mass moment of inertia of a solid sphere about its diameter is

• A. 1/5 mr2
• B. 2/5 mr2
• C. 3/5 mr2
• D. 4/5 mr2

161. The mass moment of inertia of a thin spherical shell about its diameter is

• A. 1/6 mr2
• B. 1/3 mr2
• C. 1/2 mr2
• D. 2/3 mr2

162. It is a mathematical property of a section concerned with a surface area and how that area is distributed about the reference axis.

• A. moment of area
• B. second moment of area
• C. third moment of area
• D. fourth moment of area

163. It is the material’s ability to resist twisting

• A. mass moment of inertia
• B. moment of area
• C. second moment of area
• D. polar moment of area

164. “Any object, wholly or partly immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object”. This is known as the ____________.

• A. Bernoulli’s Principle
• B. Torricelli’s Principle
• C. Archimedes’ Principle
• D. Pascal’s Principle

165. It is the upward force on an object produced by the surrounding fluid in which it is fully or partially immersed.

• A. Archimedes’ force
• B. fluid pressure
• C. buoyancy
• D. weight reaction

166. A rock of weight 10 N suspended by a string is lowered into water, displacing water of weight 3 N. Determine the tension in the string.

• A. 13 N
• B. 7 N
• C. 10 N
• D. 3 N

167. If the buoyancy of an object exceeds its weight, the object __________.

• A. tends to rise
• B. tends to sink
• C. A or B
• D. none of the above

168. It is the rate of change of velocity

• A. displacement
• B. acceleration
• C. momentum
• D. impulse

169. Impulse is equal to ________.

• A. force x time
• B. change in momentum
• C. A or B
• D. none of the above

170. Collisions in which objects rebound with the same speed as they had prior to the collision are known as __________.

• A. elastic collisions
• B. inelastic collisions
• C. static collisions
• D. plastic collisions

171. If a 10-kg object experiences a 20-N force for a duration of 0.05-second, then what is the momentum change of the object?

• A. 1 N-s
• B. 400 N-s
• C. 0.5 N-s
• D. 200 N-s

172. When hit, the velocity of a 0.2 kg baseball changes from +25 m/s to -25 m/s. What is the magnitude of the impulse delivered by the bat to the ball?

• A. 1 N-s
• B. 5 N-s
• C. 10 N-s
• D. 20 N-s

173. It is defined as the integral of force with respect to time.

• A. momentum
• B. impulse
• C. velocity
• D. acceleration

174. The SI unit for angular velocity is

• A. degrees per second
• B. revolutions per second
• C. mils per second
• D. radians per second

175. The angular momentum of a rotating object can be calculated by the formula

• A. mass moment of inertia x linear velocity
• B. mass x linear velocity
• C. mass moment of inertia x angular velocity
• D. mass x angular velocity

176. The time derivative of angular momentum is called

• A. angular velocity
• B. angular acceleration
• C. work
• D. torque

177. It defines limits on how accurately the momentum and position of a single observable system can be known at once.

• A. Heisenberg uncertainty principle
• B. particle momentum principle
• C. particle position principle
• D. Bohr’s uncertainty principle

178. The SI unit for polar moment of inertia is

• A. kg-m2
• B. kg-m4
• C. m4
• D. m2

179. A structure is _________ when the static equilibrium equations are not sufficient for determining the internal forces and reactions on that structure.

• A. statically determinate
• B. statically indeterminate
• C. dynamically determinate
• D. dynamically indeterminate

180. It is an equation used to find the final velocity of an object moving with a constant acceleration without having a known time interval.

• A. Bernoulli’s equation
• B. Torricelli’s equation
• C. Newton’s equation
• D. Cavendish’s equation

181. Torricelli’s equation of motion is

• A. Vf 2 = Vi 2 + 2as
• B. Vf = Vi + at
• C. Vf 2 = Vi 2 + at
• D. Vf = Vi + 2as

182. Which of the following is true about centripetal force?

• A. It is directed toward the center of the circular path.
• B. It appears to act outward the body.
• C. It is directly proportional to the radius of the circular path.
• D. It is inversely proportional to the square of the tangential velocity.

183. Centripetal acceleration

• A. changes the direction of the velocity.
• B. changes the magnitude of the velocity.
• C. changes the magnitude of angular velocity.
• D. changes nothing about velocity.

184. Tangential acceleration

• A. changes the direction of the velocity.
• B. changes the magnitude of the velocity.
• C. changes the magnitude of the centripetal acceleration.
• D. changes nothing about velocity.

185. The _________ is the primary force from which gravity, electromagnetic and electrostatic force manifest.

• A. Eforce
• B. Tforce
• C. Kforce
• D. Gforce

186. The value of Gforce is equal to

• A. 1.211 x 1041 N
• B. 1.211 x 1042 N
• C. 1.211 x 1043 N
• D. 1.211 x 1044 N

187. The gravitational force constant has the units

• A. m3 kg-1 s-2
• B. N kg-1 s-2
• C. m2 kg-1 s-2
• D. N kg-1 m-1

188. The gravitational force between an electron and a proton 1 meter apart is

• A. 1.02 x 1057 N
• B. 1.02 x 10-57 N
• C. 1.02 x 10-67 N
• D. 1.02 x 1067 N

189. The value of the standard gravitational parameter for Earth is

• A. 4 x 1011 m3 s-2
• B. 4 x 1014 m3 s-2
• C. 4 x 108 m3 s-2
• D. 4 x 1010 m3 s-2

190. Given that the radius of the moon is 1,730 km and mass is 7.34 x 1022 kg, determine the acceleration due to gravity on the moon.

• A. 1.6 m/s2
• B. 2.6 m/s2
• C. 3.6 m/s2
• D. 0.6 m/s2

191. It is the resistance that occurs when a round object such as a ball or a tire rolls on a flat surface.

• A. rolling resistance
• B. rolling friction
• C. rolling drag
• D. either of the above

192. Which of the following affects the magnitude of rolling resistance an object generates?

• A. type of material
• B. dimensions
• C. both A and B
• D. none of the above

193. Rolling resistance coefficient is a dimensionless quantity also known as

• A. coefficient of rolling friction
• B. coefficient of friction
• C. coefficient of resistance
• D. rolling friction constant

194. The rolling resistance coefficient of rail road steel wheel on steel rail is

• A. 0.0002 – 0.0010
• B. 0.005
• C. 0.02
• D. 0.3

195. The rolling resistance coefficient of ordinary car tires on concrete is

• A. 0.0002 – 0.0010
• B. 0.1 – 0.2
• C. 0.01 – 0.015
• D. 0.05 – 0.06

196. It is the factor by which a mechanism multiplies the force put into it.

• A. factor of safety
• B. mechanical factor
• C. mechanical advantage
• D. mechanical coefficient

197. It is the study that describes the motion of macroscopic objects.

• A. quantum mechanics
• B. classical mechanics
• C. discrete mechanics
• D. continuum mechanics

198. Determine the magnitude of the force vector F = 20i + 60j – 90k (N).

• A. 130 N
• B. 120 N
• C. 100 N
• D. 110 N

199. Determine the dot product of the two vectors U = 8i – 6j + 4k and V = 3i + 7j + 9k.

• A. 18
• B. 16
• C. 14
• D. 12

200. Two perpendicular vectors are given in terms of their components by U = Uxi – 4j + 6k and V = 3i + 2j – 3k. Determine the component Ux.

• A. 5.67
• B. 6.67
• C. 7.67
• D. 8.67

### Complete List of MCQs in General Engineering and Applied Science per topic

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