Question Discussion & Solution

It is not always necessary that we need a movie and an actor for a song. A song can be created without them. Microphone is also not essential for a song but lyrics are an essential part of a song as lyrics are the words that actually make up a song. Without, lyrics a song cannot be written.

The correct answer is Concave.

• Myopia: A person suffering from myopia can see the near objects clearly while far objects are not clear.
  • A Concave lens (diverging lens) is used by people suffering from myopia.

Additional Information

• Hypermetropia: A person suffering from hypermetropia can see distant objects clearly but not near objects.
  • People suffering from hypermetropia uses a Convex lens.
• Astigmatism: This defect arises due to the difference in the radius of curvature of the cornea in the different planes
  • The cylindrical lens is used by people suffering from Astigmatism.

The correct answer is 7.

Key Points

• The pH value of salts of strong acid and strong base is 7.
  • The salts are from a strong acid and strong base do not hydrolyze and the resulting salt pH will remain 7.
  • The anion in the salt form's strong base does not attract the H+ from the water.

Additional Information

• Salt of a strong acid and a weak base is acidic with a pH value less than 7 because acid is strong which retains the pH value less than 7.
• Salt of a weak acid and strong base is basic with a pH value of more than 7 because the base is strong hence pH of the whole solution will be more than 7.
• Salt of a strong acid and strong base is neutral because both are strong and cancels strong effects of each other, the pH will be 7.

Statement 1 and 2: correct

• OS allows the computer to manage its own resource such as memory, keyboard and printer

Statement 3: correct

• OS provides the user an easy to work user interface, so the user doesn’t have to learn a different UI every time.

Statement 4: correct

UPDATE -  the number of wetlands in India has increased to 42.

Key Points

The Ramsar Convention:

• Ramsar Convention, 1971: on Wetlands of International Importance especially as Waterfowl Habitat is an international treaty for the conservation and sustainable use of wetlands
• The Convention on Wetlands is an intergovernmental treaty that provides the framework for the conservation and wise use of wetlands and their resources.
• The Convention was adopted in the Iranian city of Ramsar in 1971 and came into force in 1975. Since then, almost 90% of UN member states, from all the world’s geographic regions, have acceded to become “Contracting Parties”.
• India is a party to the Ramsar Convention. India signed under it on 1st February 1982.
• Chilika Lake (Orissa) and Keoladeo National Park (Rajasthan) were recognized as the first Ramsar Sites of India
• Sundarbans is the largest Ramsar Site of India
• On 2nd February 2021, India’s first Centre for Wetland Conservation and Management has been set up in Chennai.
• There are 42 wetlands in India that have international importance and hence recognized as the Ramsar Sites in India. Ramsar Sites are wetlands that have international importance.

Three Pillars:

• ​Under the “three pillars” of the Convention, the Contracting Parties commit to:
  • work towards the wise use of all their wetlands;
  • designate suitable wetlands for the list of Wetlands of International Importance (the “Ramsar List”) and ensure their effective management;
  • cooperate internationally on transboundary wetlands, shared wetland systems, and shared species.

The Montreux record:

• The Montreux Record is a register of wetland sites on the List of Wetlands of International Importance where changes in ecological character have occurred, are occurring, or are likely to occur as a result of technological developments, pollution, or other human interference.
• It is maintained as part of the Ramsar List.