Question Discussion & Solution

The correct answer is about 70% water.

Important Points

• The Top Four Elements Found in the Human Body: oxygen (65%), carbon (18.5%), hydrogen (9.5%), nitrogen (3.2%).
• The other trace elements (less than 0.01%) are boron (B), cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), fluorine (F), iodine (I), iron (Fe), manganese (Mn), molybdenum (Mo), selenium (Se), silicon (Si), tin (Sn), vanadium (V), and zinc (Zn).
• The six major nutrients are carbohydrates (CHO), lipids (fats), proteins, vitamins, minerals, water.
• The functions of water in the human body:
  • Water carries nutrients and oxygen to all cells in the body.
  • Water is required for breathing.
  • Water regulates your body temperature.
  • Water protects and cushions vital organs.
  • Water cushions joints.
  • Water removes waste.

Key Points

• Calcium (Ca) is the most abundant mineral in the body and is essential for a number of vital functions.
  • Also helps muscles relax and contract, important in nerve functioning, blood clotting, blood pressure regulation, immune system health.
• Iron (Fe), Part of a molecule (haemoglobin) found in red blood cells that carries oxygen in the body, needed for energy metabolism.
• Iodine found in thyroid hormone, which helps regulate growth, development, and metabolism.
• Chromium works closely with insulin to regulate blood sugar (glucose) levels.

The correct answer is Flash memory.

Key Points

• Flash memory is a type of memory that functions similarly to RAM and ROM.
• You can write data to flash memory just like you can to RAM, however, unlike ROM, the data isn't lost when the power is turned off. Read-only memory is referred to as ROM.
• Although the CPU can read from ROM, it cannot write to or modify it. ROM is a long-term storage medium.
• Random-access memory (RAM) refers to memory that the microprocessor can read from and write to. It's done in RAM when you construct something in memory.

Important Points

• The smallest and fastest memory in a computer is register memory.
• External memory, often known as secondary memory, refers to the numerous storage media that a computer might use to store data and applications.
• Cache memory, often known as cache, is a supplementary memory system that saves frequently used instructions and data in order for the central processing unit (CPU) of a computer to perform them more quickly.

Explanation:

• Bronze is an alloy of copper and tin as the two main constituent elements.
• Bronze is a copper-based alloy that typically consists of approximately 88% copper and 12% tin.
• Some other elements added in minute quantities can be aluminium, nickel or zinc.
• It is one of the first alloys used by mankind and an entire era known as the 'Bronze Age' is known because of the extensive use of the alloy in many human artefacts.

Additional Information

Steel: 

• Stainless steel is an alloy of iron and chromium.
• Steel is an alloy of iron and carbon.
• Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon, and other alloying elements.

Solder:

• Soldering is a joining process used to join different types of metals together having different properties. 
• Solder is a metal alloy, usually made up of tin and lead which is melted using a hot iron (soldering iron).
• The iron is heated to temperatures above 600˚F which then cools to create a strong bond.
• Flux material used in soldering is ZnCl2 (Zinc Chloride) and NH4Cl (Ammonium Chloride).

Brass:

• Brass is a metal alloy that is made up of copper and zinc.
• The proportions of zinc and copper can vary to create different types of brasses with different properties.
• It has higher malleability than bronze or zinc and has a relatively low melting point (900 to 940 °C).

Mistake Points

• Copper was the first metal used by men.
• Copper was first used by man over 10,000 years ago.  
• Probably copper can be found as a naturally occurring native metal that is sometimes found in large lumps on the ground.
• People learned to make this into copper tools and other things, although, for a metal, it is quite soft.
• When it was melted over the fire, people learned how to make an alloy called bronze, which is much harder and stronger than copper.

The correct answer is Distance.

Key Points

• An odometer is a device that is used for measuring the distance traveled by a vehicle.
• The odometer is usually situated in the vehicle's dashboard.
• The word "odometer" is derived from two Greek words meaning path and measure.
• Odometer is also used by people who construct roads and survey lands.

Additional Information

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.

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