Engineering Mechanics Multiple Choice Questions on “Composite Bodies”.
1. A ______________ body consists of a series of connected “simpler” shaped bodies.
a) Composite
b) Non-composite
c) Digital
d) Binary
Answer: a
Clarification: A composite body consists of a series of connected simpler shaped bodies. That is the body is having two material as it’s constitutes. The main thing is that the single material is having the properties of two different materials.
2. Composite materials are of no use for the chemical engineers.
a) False
b) True
Answer: a
Clarification: The composite materials are of much importance to the chemical engineer. This means that the composite materials are variedly used in the chemical industries. It can be used in the bridges made for the pipelines, etc.
3. The composite materials are lighter than their constituent material.
a) False
b) True
Answer: b
Clarification: Yes the composite materials are lighter than the constituent material. This means that the density of the former is lighter than the latter. Thus imparting many qualities to the materials. Thus the material can be used variedly.
4. Composite materials can be of __________ shapes.
a) Any
b) Circular only
c) Rectangular only
d) Oval only
Answer: a
Clarification: The composite materials can be of any shape. This means that the shape of the material can be varied. Thus any shape can be imparted to the composite materials and then be used in the industries variedly.
5. Two of the things of the composite materials are to be known so that their properties can be varied. Which of the following is one of them?
a) Weight of the centre of gravity
b) Weight of the centre of body
c) Location of the centre of gravity
d) Location of the centre of mass
Answer: c
Clarification: The centre of the gravity’s location and the weight of the composite body is needed to be known. This means that if both of the quantities of the composite body is known then the properties of the body can be altered. Thus both are very important things to be known about the composite bodies.
6. The centre of mass for the composite body is the ratio of ________ to _________
a) The product of centroid and mass to the total weight
b) The addition of centroid and weight to the total weight
c) The subtraction of centroid and weight to the total weight
d) The product of centroid and mass to the total mass
Answer: d
Clarification: The product of the centroid of the section to its mass to the total mass of the body is the centre of mass. Thus the answer. The ratio is generally used to locate the coordinate of the centroid or the centre of mass.
7. The total of all the masses of small particles adds up to give the total body mass of the composite body. This mass lies along with gravity gives a force vector which is being passed by ________
a) Axis of rotation
b) Axis of rolling
c) Centre of Gravity
d) Centre of mass
Answer: c
Clarification: The total body mass along with the product of gravity always passes through the centre of gravity. All the forces are parallel is the right answer. Thus the total sum of all these small weights adds up to the total weight of the body. Which passes through the centre of gravity.
8. One of the uses of the centre of mass or centroid of the composite bodies is as in the simplification of the loading system the net force acts at the ___________ of the loading body.
a) Centroid
b) The centre axis
c) The corner
d) The base
