This document is a science exam paper containing multiple choice questions, short answer questions, and questions requiring explanations on topics related to microorganisms, fuels, combustion, and their applications and effects. The paper contains questions ranging from 1 to 4 marks testing knowledge of terms like kindling temperature, uses of yeast, what fuels produce when burned, harms of microorganisms, how CNG reduces pollution, and more. It aims to evaluate understanding of science concepts taught in various areas including microbiology, chemistry, and environmental science.