This document contains 15 multiple choice questions about general knowledge topics including sound waves, geography, physics, and environmental science. The questions cover concepts such as how sound waves travel, geographic regions near the North and South poles, processes of river transportation, identifying the largest democracy, the shortest day in the Northern Hemisphere, properties of wave reflection, factors that affect the speed of sound and pitch, and variables that determine safe noise levels.

1. General Knowledge [Questions & Answers] |Part 105|
Multiple choice quiz questions and answers
1 Sound waves travel from it's source by ________.
2 The areas around the North and South poles within the Polar circles is called ________.
3 Which of these is a process of transportation in a river?
4 The largest democratic country of the world is ________.
5 Which is the shortest day in the Northern Hemisphere?
6 Bending of waves around corners of slits is called ________.
7 Sound energy passing per second through a unit area held perpendicular is called
________.
8 If waves are reflected back in first medium after falling on second medium then angle
of reflection and angle of incidence are ________.
9 Speed of sound in air depends on the ________.
10 Sound which has Jarring effect on ears is ________.
11 Pitch of sound depends upon ________.
12 Loudness of sound is directly proportional to ________.
13 Bending of waves around corners of slits is called ________.
14 Heat waves are ________.
15 A safe level of noise depends on ________.