Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

• An electric motor converts electrical energy into mechanical energy, producing motion or rotation.
• It uses electromagnetic forces to generate torque, which drives a shaft or other mechanical components.

Explanation

• When two opposite poles (north-south or south-north) of magnets are brought close to each other, they attract each other.
• This is because opposite poles have different polarities and therefore pull each other together.

Explanation

Light travels at about 300,000 kilometers per second in a vacuum with a refractive index of 1.0,

but slows down to 225,000 kilometers per second in water

and 200,000 kilometers per second in the glass.

ND16-3-2023

Explanation

• Inertia is the tendency of an object to resist changes in its motion.
• As described by Newton's First Law of Motion (also known as the Law of Inertia).
• This means that an object at rest will remain at rest, and an object in motion will continue moving in a straight line, unless acted upon by an external force.

Explanation

• Cholera is a waterborne disease caused by the bacterium Vibrio cholerae, which is typically found in contaminated water sources.
• If a child has cholera, it indicates that they have ingested contaminated water.
• It addressing water pollution is crucial to prevent further spread of the disease.

Water pollution can cause:

• Waterborne diseases (cholera, typhoid, diarrhea)
• Death of aquatic life (fishes, animals, plants)
• Health problems (immune depression, reproductive failure, acute poisoning)

Explanation

• Stars generate their own light through nuclear fusion in their cores.
• It making them self-luminous.

Explanation

• Asthma is a respiratory disease that can be triggered or exacerbated by exposure to air pollution.
• Air pollution can irritate the airways, trigger asthma attacks, and make symptoms worse.

Air pollution can cause:

• Respiratory problems: asthma, pneumonia, lung cancer
• Irritation: headaches, eyes and nose irritation, sore throat
• General symptoms: nausea, drowsiness, ill feeling
• Impaired judgment and weakened cognitive function

Explanation

• Light travels in a straight line.
• It is also known as a rectilinear path.
• It in a homogeneous medium like air or vacuum.

Explanation

Frogs can breathe through their skin, lungs, and lining of the mouth, especially in water where cutaneous respiration is key.

This ability helps them absorb oxygen directly from their environment.

Earthworms and amphibians, such as frogs, breathe through their skin.