- The document is an exam for a Manufacturing Wastes and Environmental Pollution course, which has two parts - multiple choice questions and theory questions. - The multiple choice section contains 4 questions testing knowledge on waste management hierarchy, important ecosystem organisms, the definition of ecological balance, and the origin of energy in a food chain. - The theory section contains 5 short answer questions about the definition of waste, different waste types, waste segregation methods, the 3R terms in waste hierarchy with examples, the definition and goal of waste management, and ecological pyramids and their types.

1. MIZAN TEPI UNIVERSITY COLLEGE OF
ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
Course Name: Manufacturing Wastes and Environmental Pollution Time allowed 1:30 hr.
Course Code: (MaEng 4271)
Total marks: [30 % ] Year IV Date 19/2/2022
Name ID Group
INSTRUCTIONS
i. Make sure that there are two parts
ii. Answer all the questions.
iii. Apply sensible time management.
iv. Misconduct of any kind and wrong move of any sort will lead to apenal
ty.
v. Neatness and legibility will have the positiveasset.
Part I multiple-choice (2pts each)
1. What is the order of waste management hierarchy, from most to least favored
A) Prevention- Recycle-Reuse- Disposal B) Prevention-Reuse-Disposal-Recycle
C) Prevention-Disposal -Reuse-Recycle D) Prevention-Reuse-Recycle-Disposal
2. The most important organisms for an ecosystem are
A) Herbivorous B) Carnivorous C) Green plants D) Protozoa
3. Which of the following is the definition of ecological balance?
A) An ecosystem in a state of stability where species coexist with other organisms and their
environment
B) An ecosystem that never changes
C)An ecosystem that is in a state of chaos where species do not coexist in harmony
D) An ecosystem where species live independently from one another
4. All the energy in the food chain originates from-------------
A) plants B) sun C) sea D) all
Part II Theory (22%)
1. a) What is meant by waste? B) what are the different types of waste? (4pt)
2. What do you mean by the segregation of waste? How do you segregate waste? (4pt)
3. What does the 3R represent in the waste hierarchy? give examples for each term? (5pt)
4. a) What is waste management? B) What is the prime goal of waste management? (5pt)
5. Discuss about ecological pyramids, types of ecological pyramids? (4pt)