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Which country invented the first postal system?

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Important Questions on World General Knowledge

EASY

Which of the following statements about Bitcoin is/are correct?

  1. It is a decentralized virtual currency,
  2. It is generated through complex computer software systems.
  3. The Reserve Bank of India recognized it as a legal tender in January 2016

Select the correct answer using the code given below.

EASY
A plane electromagnetic wave of wavelength λ has an intensity I. It is propagating along the positive Y-direction. The allowed expressions for the electric and magnetic fields are given by:
EASY
What is the name of the currency of the Republic of Finland?
EASY
To double the covering range of a TV transmitting tower, its height should be multiplied by:
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A TV transmission tower has a height of 140 m and the height of the receiving antenna is 40 m. What is the maximum distance upto which signals can be broadcasted from this tower in LOS (Line of Sight) mode? (Given: radius of earth =6.4×106 m).
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In a communication system operating at wavelength 800 nm, only one percent of source frequency is available as signal bandwidth. The number of channels accommodated for transmitting TV signals of band width 6 MHz are (Take velocity of light c=3×108 m/s, h=6.6×10-34 J-s )
EASY
Long-range radio transmission is possible when the radio waves are reflected from the ionosphere. For this to happen the frequency of the radio waves must be in the range:
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A transmitting antenna at the top of a tower has a height 32 m and the height of the receiving antenna is 50 m. What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode?

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'Dinar' is the currency of which of the following countries?