Question Discussion & Solution

The correct answer is Sodium and potassium.

Key Points

• Sodium and Potassium metals are the two metals which are soft and can be cut with a knife.
  • Both belong to Alkali metals [first group of periodic table]
  • They are reactive metals.
  • As the atomic size increases down the group, so the force of attraction between the valence electron and nucleus decreases. 
  • Metallic bonds are not strong.
  • Potassium is softer than sodium.

Additional Information 

• Mercury- In a liquid state at room temperature, It is unique as a metal.
  • Mercury (Hg), also known as quicksilver.
  • Atomic Number- 80
• Zinc- Related to low Melting group.
  • Atomic Number- 30
  • Symbol- Zn
• Tin- It is a soft silvery-white metal with a bluish tinge.
  • Atomic Number- 50
  • Symbol- Sn

The correct answer is C.P.U.

Key Points

• CPU (Central Processing Unit)
  • It is the most important part of the computer as it performs the main function  of information processing.
  • It makes all the required calculations and processes data.
  • It is called the brain of the computer.​ 
• An input device sends information to a computer system for processing, and the device reproduces or displays the results of that processing as an output device. 
  • Input devices include Keyboard, Mouse, Scanner, Microphone, Digital Cameras, Barcode reader, Webcam, etc.
  • Output devices include printers, projectors, Plotters, monitors, Speakers, Head Phones, etc.
• Charles Babbage is considered the father of computers.

The source of rain is clouds.

Similarly, the source of heat is fire.

The correct answer is Canada.

Key Points

• The federal government system of India has been taken from the Canadian Constitution.

Additional Information

• Only the Parliament has the power to make laws on the subjects of the Union List.
• Article 245 to 255 of the Constitution discusses the Centre-State legislative relations in Part-XI.
• In the Constitution of India, three types of lists are present in the Seventh Schedule as the legislative powers between the Center and the States.
• The 'Union List' mentions important subjects, which include defence, communication, foreign policy, etc., and where only the laws of the Center are effective.

The correct answer is Bori Bunder.

Key Points

• The Great Indian Peninsula Railway (GIPR) was a predecessor of the Central Railway whose headquarters was at the Bori Bunder in Bombay (later, the Victoria Terminus and presently the Chhatrapati Shivaji Maharaj Terminus).
• The Great Indian Peninsula Railway Company was incorporated on 1 August 1849 by the Great Indian Peninsula Railway Company Act 1849 of the Parliament of the United Kingdom. 
• On 21 August 1847, it entered into a formal contract with the East India Company for the construction and operation of a railway line, 56 km long, to form part of a trunk line connecting Bombay with Khandesh and Berar and generally with the other presidencies of India.
• On 1 July 1925 its management was taken over by the Government.
• On 5 November 1951, it was incorporated into the Central Railway.

​