Question Discussion & Solution

Judge is the head in the court while the Principal is the head in a college.

The correct answer is Displacement.

Key Points

•  Displacement
  • When a body moves from one position to another, the shortest distance between the initial position and final position of the body along with direction is known as Displacement.
  • Its SI unit is a meter.
  • It is a vector quantity.
  • Displacement of the object can be positive, negative, zero.
  • Displacement of the object can never be greater than the distance traveled by it.
• When there is no change in an initial position and final position even after covering some path, then it is considered zero displacements.

Additional Information

• Distance
  • It is the actual path covered by a moving body irrespective of the direction in which the body travels.
  • Its SI unit is a meter.
  • It is a scalar quantity.
  • An odometer is used to measure the distance traveled by the vehicle.  
• Speed
  • The time rate of change of position of the object in any direction is called the speed of the object.
  • It is a scalar quantity.
  • Its SI unit is m/s.
  • Speed= Distance travelled/Time taken
• Frequency
  • It tells us how frequently an event occurs.
  • The number of complete waves produced in one second is called the frequency of the waves.
  • Hertz is the SI unit of Frequency. It is named in the honor of Rudolf Hertz.
  • 1 Hertz= 1 vibration per second.

Concept:

• Any battery (actually it may have one or more than one cell connected in series) or cell that we use as a source of electrical energy is a galvanic cell where the chemical energy of the redox reaction is converted into electrical energy. 
• In the primary batteries, the reaction occurs only once, and after use over some time battery becomes dead and cannot be reused again.
• The most familiar example of this type is the dry cell (known as Leclanche cell after its discoverer) which is used commonly in our transistors and clocks. 
• The cell consists of a zinc container that also acts as anode and the cathode is a carbon (graphite) rod surrounded by powdered manganese dioxide and carbon.
• The space between the electrodes is filled by a moist paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2). 

Explanation:

• The cell consists of a zinc container that acts as the anode.
• The cathode is a carbon (graphite) rod surrounded by a cathodic material powder of manganese dioxide and carbon.

So, The positive pole of the dry cell is made up of C (carbon).

The correct answer is Viticulture.

• Cultivation of grapes called Viticulture.

Key Points

• Cultivation of grapes either for wine production or for raw consumption (table grapes) is called Viticulture.
• China is the leading producer of grapes.
• It accounts for 16.9% of global production.
• China is followed by Italy at 10.8%, and later by the United States at 8.7%.

Additional Information

• Horticulture is a type of agriculture in which fruits and vegetables are grown.
• The breeding, rearing, and transplantation of fish are called pisciculture.
• Sericulture is the production of raw silk by means of raising caterpillars.

The correct answer is Gulab Kothari.

• Gulab Kothari was awarded Raja Ram Mohan Roy National Award 2019 for outstanding work in the field of journalism.

Key Points

• Gulab Kothari is an eminent Journalist and chairman of Rajasthan Patrika Private Limited.
• He was selected by the Press Council of India.

Additional Information

• Akkitam Achuthan Namboodari was a poet and essayist.
  • He was awarded the Jnanpith Award.