Question Discussion & Solution

Crane, swan and falcon are the birds whereas frog is not a bird.

The diagram that best represents the relationship among Sun, Moon and Universe:

Both the Sun and Moon belong to the universe.

Hence, ‘option 2’ is the correct answer.

The correct answer is F2.

Key Points

• F2 function key is used to edit the content of a cell in MS-Excel.
• To enter Edit mode, we can follow any of these steps:
  • Double-click the cell that contains the data that you want to edit.
  • Click the cell that contains the data that you want to edit, and then click anywhere in the formula bar.
  • Click the cell that contains the data that you want to edit, and then press F2.

Additional Information

Some important shortcuts used in MS Excel:

• Ctrl + N Create a new workbook.
• Ctrl + O Open an existing workbook.
• Ctrl + S Save the active workbook.
• F12 Save the active workbook under a new name, displays the Save as dialog box.
• Ctrl + W Close the active workbook.
• Ctrl + C Copy the contents of the selected cells to Clipboard.
• Ctrl + X Cut the contents of the selected cells to Clipboard.
• Ctrl + V Insert the contents of the Clipboard into the selected cell(s).

CONCEPT:

Nuclear reactor:

• In a nuclear reactor, the energy is generated by a nuclear fission reaction.
• In a nuclear reactor, there is a concrete chamber and in this concrete chamber, there is a steel vessel. In this steel vessel, the nuclear fission reaction takes place.
• Fuel rods: Fuel rods are placed inside the steel chamber.
  • These rods are made of fissionable material. Generally, fuel rods are made of uranium-235, thorium, etc.
• Moderator: It is used to decrease the speed of fast-moving neutrons.
• Control rods: These rods are placed between the fuel rods. It is used to control the chain reaction. Control rods are generally made of cadmium.
  • The nuclear reactors are controlled by means of control rods which are made of a strongly neutron-absorbent material such as boron or cadmium (Cd).
• Coolant: It is used to absorb heat produced during the reaction.

EXPLANATION:

• Moderators are used to slow down the neutrons in order to carry out effective nuclear fission and also absorb neutrons. 
• The main reason why heavy water is used as the moderator is that it captures less number of neutrons compared to normal water Hence, option 2 is the answer. 

The correct answer is United States.

Key Points

• The United States reclaimed the Ryder Cup in September 2021, defeating Europe 19-9.
• It’s the first time since 1979 and 1983 that Team USA won back-to-back home Ryder Cups after winning in 2016 at Hazeltine.
• The Americans lost in 2018 in France and seven of the last 10 Ryder Cups against Europe.
• This time, it is the largest margin of victory in Ryder Cup history since the 28-point format came about.

Additional Information

•  About Ryder Cup:
  • The Ryder Cup is a biennial men's golf competition between teams from Europe and the United States.
  • The competition is contested every two years with the venue alternating between courses in the United States and Europe.
  • It was first played in 1927.