Question Discussion & Solution

Concept:

• Water Harvesting: Water harvesting is a practice to conserve water by collecting rainwater in an organized way.
  • The rainwater is not allowed to flow and get wasted but collected in tanks.
  • The main purpose however is not the collection but the enhancement of groundwater level.  
  • The collected water through tubes is made to recharge groundwater.
  • Maintenance of groundwater is long term sustainable structure for water conservation.

Here the logic is the methods which consumes water:

Explanation:

Kneading:

• Kneading is a process in the making of dough by mixing water and flour.
• Example: Kneading dough for roti. 
• Consumes water

Swimming also need water to do so.

Washing clothes is also a process that consumes.

While combing hair, no need of water.

The correct answer is Digital Camera.

Key Points

• An input device is any hardware device that sends data to a computer, allowing us to interact with and control it.
• For instance- Keyboard, Mouse, Joy Stick, Light pen, Track Ball, Scanner, Graphic Tablet, Microphone.
• A digital camera is an input device that captures images (and sometimes video) digitally.
• Digital cameras use an image sensor chip to capture the image.
• However, it can also be used as an output device. The digital camera can send pictures to our computer.
• An output device is any hardware device used to send data from a computer to another device or user.
• Examples of output devices are-
  • monitors and projectors (video), headphones and speakers (audio), or printers and plotters (physical reproduction in the form of text or graphics).

The pattern followed here is:

Hence, “XRW” is the correct answer.

The correct answer is Minamata.

Key Points

• Minamata disease is a disease caused by severe mercury poisoning.
• It is a neurological disease.
• Symptoms of the disease:-
  • Ataxia, general muscle weakness, numbness in the hands and feet, loss of peripheral vision, and damage to hearing and speech.

Additional Information

• Due to mining, Itai-Itai disease was caused by cadmium poisoning.
• Symptoms of Methemoglobinemia:- 
  • Headache, shortness of breath, dizziness, nausea, blue-colored skin, and poor muscle coordination.
• Poliomyelitis is caused by infection with a member of the genus Enterovirus. It is known as poliovirus.