Orbital Mechanics MCQ

Test your knowledge with important Orbital Mechanics MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Orbital Mechanics MCQs at Bissoy

• Which of these reasons does not result in persistent residue level?
  ক

  Non- uniform gravitational field

  খ

  Oblateness

  গ

  Wind pressure

  ঘ

  Solar radiation pressure
• How accurate is the directional information provided by the radio interferometer?
  ক

  10-20 sec

  খ

  20-40 sec

  গ

  40-50 sec

  ঘ

  1-4 min
• What is the position uncertainty for tracking radar?
  ক

  100m – 500 m

  খ

  500m – 1km

  গ

  100 – 500 km

  ঘ

  > 500 km
• What is the position uncertainty for detection radar?
  ক

  1000 m

  খ

  5000 m

  গ

  1000 km

  ঘ

  5000 km
• What are the disadvantages of the optical sensors?
  ক

  They are not accurate

  খ

  Satellite must be in darkness

  গ

  They are not efficient

  ঘ

  Weather must be favorable
• Which of these devices is used to observe objects by having two or more antennas with high aperture?
  ক

  Radio interferometer

  খ

  Telescope

  গ

  Hyper telescope

  ঘ

  Optical Interferometer
• Which of these radars operate by identifying signature od a booster by disturbance in ionosphere?
  ক

  Continuous wave radar

  খ

  Over- the- horizon radar

  গ

  Surface radar

  ঘ

  Pulse radar
• Which of these developments in tracking radars help in tracking multiple targets?
  ক

  Thinned array

  খ

  Antenna array

  গ

  Smart antenna

  ঘ

  Phased array
• How many categories of radar sensors are present?
  ক

  1

  খ

  2

  গ

  3

  ঘ

  4
• A hybrid of mechanically steered antenna with phased array configuration is the future of surveillance.
  ক

  True

  খ

  False
• Where are all the radars located for the purpose of surveillance?
  ক

  Northern hemisphere

  খ

  Southern hemisphere

  গ

  Equator

  ঘ

  Between Tropic of Cancer and Capricorn
• Which of these is not a function of Spacetrack?
  ক

  Cataloguing space objects

  খ

  Reconnaissance satellite payload recovery

  গ

  Antisatellite targeting

  ঘ

  Explode the unwanted debris
• How many observations are required to confirm and locate reentry of the object for surveillance?
  ক

  10-20

  খ

  20-50

  গ

  100-200

  ঘ

  200-300
• How many observations are required to update the already established orbit for surveillance?
  ক

  10-20

  খ

  20-50

  গ

  100-200

  ঘ

  200-300
• How many observations are required for the first few initial days for orbital surveillance?
  ক

  10-20

  খ

  20-50

  গ

  100-200

  ঘ

  200-300
• What is the necessity for space surveillance?
  ক

  To keep track of space debris to avoid collision

  খ

  To track unethical deployment of satellites

  গ

  To track military operation of other countries

  ঘ

  To track extra-terrestrial activity
• Which of these radars can detect targets at long ranges?
  ক

  Passive radar

  খ

  Over the horizon radar

  গ

  Pulse- Doppler radar

  ঘ

  Monopulse radar
• Which of these does not contribute in sending inputs to Spacetrack?
  ক

  Ballistic Missile Early Warning System

  খ

  Navy Space Surveillance System

  গ

  Over the horizon radars

  ঘ

  Space object recognition system
• Which of these organizations is responsible for keeping track of space population?
  ক

  Aerospace Force of Aerospace Defense Command

  খ

  Continental Air Force

  গ

  NASA

  ঘ

  SAGE
• Which of the following statement is incorrect about Julian day?
  ক

  The Julian day count is uniform and continuous and does not involve leap years or different numbers of days in different months

  খ

  The number of days between two events is found by simply subtracting the Julian day of one from that of the other

  গ

  The Julian day begins at noon rather than at midnight so that astronomers observing the heavens at night would not have to deal with a change of date during their watch

  ঘ

  Julian day is more useful for people resident on the Earth
• Julian day number is the number of days since _____
  ক

  December 1, 4713 BC

  খ

  January 1, 2000

  গ

  January 1, 4713 BC

  ঘ

  December 1, 1900
• The system measured by the sun’s passage across the Greenwich meridian is called _____
  ক

  Universal time

  খ

  Apparent Solar time

  গ

  Sidereal time

  ঘ

  Julian day
• Which is not a time system?
  ক

  Julian Day

  খ

  Atomic time

  গ

  Universal time

  ঘ

  Polar time
• Local sidereal time of a site is the time elapsed since the local meridian of the site passed through the vernal equinox.
  ক

  True

  খ

  False
• What is the reference for the Sidereal time?
  ক

  The Sun

  খ

  The centre of the Celestial sphere

  গ

  The Moon

  ঘ

  The Stars
• A solar day comprises of ______
  ক

  12 hours

  খ

  24 hours

  গ

  23 hours 56 mins

  ঘ

  24 hours 4 mins
• Which of the following is a correct statement about time?
  ক

  Time is not a fundamental dimension in science

  খ

  Time can be calculated by the same method throughout the universe

  গ

  The main purpose of time is to define with precession, the exact moment of a phenomenon

  ঘ

  The epoch designates a particular instant described as a day
• What is the time between two successive upper transits of the sun across a local meridian called?
  ক

  Apparent solar day

  খ

  Solar day

  গ

  Sidereal time

  ঘ

  Universal time
• If the Earth’s central angle is 58.3 deg and the angle of elevation for a satellite is 8.9 deg, then what is the value of the nadir angle?
  ক

  31.7 deg

  খ

  40.6 deg

  গ

  139.4 deg

  ঘ

  22.8 deg
• The Molniya orbit exhibits a ground track having 180 deg rotational symmetry about the equator.
  ক

  True

  খ

  False