Physics
Grade-9
Easy
Question
Human lungs expand and contract during breathing. The movement of the lungs during breathing is an example of:
- Uniform motion
- Circular motion
- Periodic motion
- Non-uniform motion
Hint:
The lungs expand and contract in a regular interval of time and the motion is repetitive. So, its a periodic motion.
The correct answer is: Periodic motion
The lungs expand and contract in a regular interval of time and the motion is repetitive. So, its a periodic motion.
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Select topic sentence of below paragraph.
In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.
Select topic sentence of below paragraph.
In the developing world, 1.1 billion people still do not have access to safe drinking water, 2.6 billion do not have access to adequate sanitation services, and waterborne diseases are responsible for more than 1.6 million deaths each year (mostly in children under five). Water is often too expensive or inaccessible to the poorest members of society in developing countries, while the wealthy have it piped into their homes. Furthermore, due to the infrastructure used to control water, entire seas are being lost, rivers are drying up, millions of people have been displaced to make room for reservoirs, groundwater aquifers are being pumped down, and water disputes have raised tensions from local to international levels. Fresh water is a scarce resource in many parts of the world, and it is expected to become even more so as the twenty-first century progresses.
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