IAS Interview Question Part 9

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Q. (1) Why is there a cross mark on the backside of a train (Indian Railways)?

Image of Why is there a cross mark on the backside of a train (Indian Railways)?

Image of Cross Mark on the Backside of a Train.

Image of Why is there a cross mark on the backside of a train (Indian Railways)?

  • There are many reasons behind the symbol of cross mark.

  • It indicates that wagon consisting of this letter X is the last wagon of the train.

  • The Letter “X” is used during morning whereas Red light below it is used to indicate during night.

  • If the last wagon of the train doesn’t contain this symbol, then it indicates that the train is in trouble and also it can be known that train is running without some wagons.

  • It can easily alert the railway officials so that they can save from the accident.

Q. (2) Why do doctors wear white and lawyers black?

Image of Why do doctors wear white and lawyers black coat

Image of Doctors Wear White and Lawyers Black Coat

Image of Why do doctors wear white and lawyers black coat

  • Choosing a black colour for lawyer’s uniform has two reasons.

  • First is in the old times, there was no available of dyes in the large quantity.

  • The purple colour was signified to royalty, so the only fabric colour left was black. This is the reason to select black colour for lawyers.

  • Another reason behind this is black is considered as a colour of authority and dominance.

  • A person in black coat looks more powerful and impactful. Also black colour represents submission to a certain thing.

  • As priests wear a black coat to show their submission to God, lawyers wear the black outfit to show their submission to justice.

  • Seventy-two per cent of all hospital doctors and medical students wear white coats and most wear them greater than 75% of the time. White coats are worn chiefly for easy recognition by colleagues and patients, to put items in the pockets and to keep clothes clean.

  • The white coat has been the symbol of the medical doctor.

  • While the white coat ceremony has tried to create a new conception of the white coat within the medical community, public perception of the doctor in the white coat retains the prestige of paternalistic medicine.

Q. (3) What is the meaning of four colour dots in Newspaper?

Image of What is the meaning of four colour dots in Newspaper

Image of Four Colour Dots in Newspaper

Image of What is the meaning of four colour dots in Newspaper

  • The four multi - coloured dots are called CMYK—C for Cyan (which usually means Blue), M for Magenta (Pink), Y for Yellow, and K for Black.

  • CMYK is used for the colours used in printing newspapers, and these four colours are often printed on the paper in a heart, dot and square shape.

  • If the four dots on your newspaper are blur, or the colours overlapping on the image, it means the printing is not good. To print an accurate and perfect image, the colours and shapes of the CMYK indicator must be arranged precisely, and be clear and sharp.

Q. (4) Why are tyres black?

Image of Why are tyres black

Image of Black Tyres

Image of Why are tyres black

  • The natural colour of rubber is a milky white, the black colour was originally caused by soot. The soot was thought to increase the durability of the tyre.

  • The main reason for black tyres on cars today is the chemical compound ‘carbon black’.

  • It is used as a stabilizing chemical, which is combined with other polymers to create the tread compound of a tyre.

  • Carbon black expands the lifespan of tyres.

  • Black tyres not only increase strength and durability but also affect the safety of your driving.

  • The carbon black readily-available material that provides greatly improved wear characteristics and heat-dissipation capabilities when added to rubber compounds. Natural rubber is off-white in color, and in fact the first rubber tires were white.

Q. (5) Why are stones inserted in the middle of the Rail Track?

Image of Why are stones inserted in the middle of the Rail Track

Image of Stones Inserted in the Middle of the Rail Track

Image of Why are stones inserted in the middle of the Rail Track

  • The crushed stones you see alongside railroad tracks are what is known as ballast. Their purpose is to hold the wooden cross ties in place, which in turn hold the rails in place.

  • Think about the engineering challenge faced by running miles of narrow ribbons of steel track on top of the ground, they are subject to heat expansion and contraction, ground movement and vibration, precipitation build-up from rough weather, and weed and plant growth from underneath.

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