# MCQ in Engineering Mechanics Part 3 | ECE Board Exam

(Last Updated On: February 22, 2020)

This is the Multiples Choice Questions Part 3 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 III of the Series

Choose the letter of the best answer in each questions.

101. A physical quantity that is completely described by a real number is called ___________.

• A. scalar
• B. vector
• C. tensor
• D. none of the above

102. A convenient means of representing physical quantities that have magnitude and direction.

• A. scalars
• B. vectors
• C. tensors
• D. none of the above

103. The product of a scalar and a vector is a

• A. scalar
• B. vector
• C. tensor
• D. none of the above

104. It is simply a vector whose magnitude is 1

• A. moment vector
• B. tensor
• C. unit vector
• D. vector unity

105. It is sometimes called the scalar product.

• A. dot product
• B. vector product
• C. cross product
• D. unit scalar

106. To calculate for the force exerted on a charged particle by a magnetic field, _________ is used.

• A. vector product
• B. scalar product
• C. dot product
• D. vector sum

107. It is sometimes called the vector product.

• A. dot product
• B. cross product
• C. tensor product
• D. unit vector

108. Which of the following statements is false?

• A. The cross product is commutative.
• B. The cross product is associative with respect to scalar multiplication.
• C. The cross product is distributive with respect to vector addition.
• D. The angle between two identical vectors placed tail to tail is zero.

109. When a force is represented by a vector, the straight line collinear with the vector is called the ________.

• A. line of apsides
• B. line of reaction
• C. line of vector
• D. line of action

110. A system of forces is __________ if the lines of action of the forces intersect at a point.

• A. parallel
• B. coplanar
• C. concurrent
• D. two-dimensional

111. A system of two forces is ___________ if the lines of action of the forces lie in a plane.

• A. coplanar
• B. two-dimensional
• C. A or B
• D. none of the above

112. Force acting on an object is called a ___________ if its acts on the volume of the object.

• A. internal force
• B. external force
• C. body force
• D. surface force

113. If each point on the object has the same constant velocity, this is referred to as __________.

• A. continuum translation
• B. discrete translation
• C. finite translation

114. The moment of a force about a point P is equal to the sum of the moments of its components about P.

• A. Cavalieri’s Theorem
• B. Pascal’s Theorem
• C. Varignon’s Theorem
• D. Torricelli’s Theorem

115. It is the measure of the tendency of a force to cause rotation about a line or axis.

• A. moment
• B. momentum
• C. impulse
• D. torsion

116. A couple is composed of two forces that are

• A. equal
• B. equal and opposite
• C. equal and different lines of action
• D. equal, opposite and different lines of action

117. Which of the following statements is true about a couple?

• A. A couple does not tend to cause a rotation of an object.
• B. The vector sum of the force couple always has a value.
• C. A couple tends to cause a rotation of an object.
• D. The moment it exerts is not the same about any point.

118. If an object is on an inclined plane having an angle θ, the component of weight (w) parallel to incline is __________.

• A. w sinθ
• B. w cosθ
• C. w tanθ
• D. w cotθ

119. A type of force acting on a body due to the acceleration of gravity.

• B. shear
• C. bear
• D. mass

120. A type of force acting on a body caused by the friction between the body and the ground.

• B. shear
• C. bear
• D. mass

121. The unit of force, Newton, is equivalent to

• A. lbm-ft/s2
• B. g-cm/s2
• C. kg-m/s2
• D. kgf

122. When a body is in contact with the ground, the force that is reflected back to the body is called

• A. ground reflected force
• B. gravity reflected force
• C. ground reaction force
• D. gravity reaction force

123. The gravity in the moon is about

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

124. The ground reaction force on a body can be represented by a single force acting on a point called

• A. center of force
• B. center of reaction
• C. center of reflection
• D. center of pressure

125. The tuning effect on a body is dependent on which of the following?

• A. mass of the load
• B. acceleration of gravity
• C. moment arm
• D. all of the above

126. The perpendicular distance of the force from the point about which the body will turn is called

• A. moment arm
• B. moment distance
• C. lever arm
• D. A or C

127. If the force is moved in the direction parallel to the direction of the force, the moment exerted by the force ___________.

• A. increases
• B. decreases
• C. is unchanged
• D. becomes zero

128. 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 axis.
• D. all of the above

129. __________ is finding a single force which shall be equal to two or more given forces when acting in given directions.

• A. resolution of forces
• B. integration of forces
• C. composition of forces
• D. quantization of forces

130. He is the father of the modern engineering mechanics

• A. Gilbert Lewis
• B. Stephen Timoshenko
• C. J. Gordon
• D. A. Cotrell

131. It is a method of applying mechanics that assumes all objects are continuous.

• A. Discrete Mechanics
• B. Finite Element Method
• C. Continuum Mechanics
• D. Contact Mechanics

132. Which of the following is an example of contact force?

• A. gravitational force
• B. magnetic force
• C. air resistance force
• D. electric force

133. It occurs when an object is moving across a surface.

• A. dynamic friction
• B. static friction
• C. kinetic friction
• D. sliding friction

134. Given µ = 0.35 between the object of mass 400 g and the floor, the object will __________ if pulled with a force of 3 N.

• A. remain at rest
• B. move
• C. accelerate
• D. B and C

135. Which of the following statements is correct?

• A. The coefficient of static friction is always less than 1.
• B. The coefficient of static friction is typically greater than the coefficient of kinetic friction.
• C. The coefficient of kinetic friction is typically greater than the coefficient of static friction.
• D. The coefficient of static and kinetic friction are always equal.

136. The equations that apply to bodies moving linearly (that is, one dimension) with uniform accelerations are often referred to as

• A. UVATS
• B. SUVAT
• C. UVATS
• D. Either of the above

137. “Observed from an internal reference frame, the net force on a particle is proportional to the time rate of change of its linear momentum”. This is known as Newton’s ___________ of motion.

• A. Zeroth Law
• B. First Law
• C. Second Law
• D. Third Law

138. It is also known as quantity of motion.

• A. momentum
• B. force
• C. mass
• D. acceleration

139. This concept assumes that the substance of the body is distributed throughout and completely fills the space it occupies.

• A. Finite Element
• B. Contact
• C. Discrete
• D. Continuum

140. In fluids, _________ is used to assess to what extent the approximation of continuity can be made.

• A. Brayton Number
• B. Knudsen Number
• C. Reynolds Number
• D. Prandtl Number

141. It is the time rate of change of any property of a continuum for a specified group of particles of the moving continuum body.

• A. Material Derivative
• B. Continual Derivative
• C. Particle Derivative
• D. Quantum Derivative

142. Material derivative is also known as __________.

• A. substantial derivative
• B. commoving derivative
• C. convective derivative
• D. all of the above

143. The vector connecting the positions of a particle in the undeformed and deformed configuration is called the ________.

• A. displacement vector
• B. position vector
• C. displacement field
• D. position field

144. A __________ is a vector field of all displacement vectors for all particles in the body.

• A. position field
• B. action field
• C. displacement field
• D. path field

145. _________ is the study of the physics of continuous solids with a defined rest shape.

• A. Continuum Mechanics
• B. Solid Mechanics
• C. Fluid Mechanics
• D. Discrete Mechanics

146. It is an experimental method for visualizing and analyzing fluid flow.

• A. Particle Image Velocimetry
• B. Particle Image Accelerometry
• C. Particle Image Flowmeter
• D. Particle Image Viscosimetry

147. A fluid at rest has no

• A. longitudinal stress
• B. shear stress
• C. tensile stress
• D. compressive stress

148. A property of fluids which is the force generated by a fluid in response to a velocity gradient.

• A. compressibility
• B. plasticity
• C. elasticity
• D. viscosity

149. These equations state that changes in momentum of fluid particles depend only on the external pressure and internal viscous forces acting on the fluid.

• A. Navier – Stokes Equations
• B. Torricelli Equations
• C. Reynolds Equations
• D. Lagrangian Equations

150. It is defined as, regardless of the forces acting on a fluid, the fluid continues to flow

• A. Newtonian fluid
• B. non-Newtonian fluid
• C. Lagrangian fluid
• D. non-Lagrangian fluid

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

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