Explanation

The permanent hardness of water is caused by Chloride, Nitrates, Calcium and Sulphates of Magnesium 

Permanent Hardness is not precipitated by boiling 

It is removed by Zeolite

Additional Information:

The Presence of Calcium and Magnesium Bicarbonates causes temporary hardness of water 

Temporary hardness can be removed by boiling the water

Explanation

Air is a homogeneous mixture of the gaseous substances

nitrogen,

oxygen, 

smaller amounts of other substances.

Explanation

• The acceleration due to gravity is 9.8 m/s² downward.
• This force acts on the ball throughout its motion.
• This pulling it back to the ground after it is thrown upwards.

Last updated 27-07-2026 by NA

Explanation

Typhoid and Cholera are both waterborne diseases that can be caused by drinking contaminated water.

• Typhoid fever is a bacterial infection caused by Salmonella Typhi, which can be spread through contaminated food and water.
• Cholera is a diarrheal disease caused by Vibrio cholerae, which can be spread through contaminated food and water, as well as through person-to-person contact.

Explanation

Polio, or poliomyelitis, is a disabling and life-threatening disease caused by the poliovirus.

The virus spreads from person to person

and can infect a person's spinal cord, causing paralysis (can't move parts of the body).

***

The Polio vaccine was invented by___?

 Jonas Salk

Which country launched a polio vaccine drive after 1988 in April 2022?

 Israel

Explanation

About Jupiter

It is the heaviest planet in our solar system

It is the largest planet in our solar system

It rotates about once every 10 hours

It has 79 satellites

It is the fifth planet 

It is larger than the earth 

Explanation

• Robert Watson-Watt: Scottish engineer and inventor.
• Known For: Developing the first practical radar system.
• First Demonstration: 1935

Additional information

• Radar: Stands for Radio Detection and Ranging.
• Function: Uses radio waves to detect and locate objects.
• Importance: Played a crucial role during World War II.

Explanation

Fresh milk has a pH value of 6.7.

Bacteria from the family of Lactobacillaceae are lactic acid bacteria (LAB) responsible for the breakdown of the lactose in milk to form lactic acid.

Explanation

Tape speed is measured in inch per second.

Explanation

Slumps are different from flows because, although the material under the slump may act like a liquid, the actual material that slides downhill stays solid.