Gravitation MCQ

Test your knowledge with important Gravitation MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30+ more Gravitation MCQs on Bissoy. Bissoy App

• How do astronauts define “up” or “down” in space?
  ক

  There is no “up” or “down” in space

  খ

  The side facing the earth is “down” and the opposite side is ‘up”

  গ

  “up’ or “down” is decided by the control centre on earth

  ঘ

  The direction of the spacecraft’s power source is “up” and the opposite side is “down”
• A person sitting in a chair in a satellite feels weightless because _____
  ক

  the earth does not attract the objects in a satellite

  খ

  the normal force by the chair on the person balances the earth’s attraction

  গ

  the normal force is zero

  ঘ

  the person in the satellite is not accelerated
• An object is weightless inside a uniform spherical shell.
  ক

  True

  খ

  False
• Why do the astronauts in the international space station experience weightlessness?
  ক

  The acceleration due to gravity at that height is zero

  খ

  They are falling towards the earth

  গ

  They have specially designed spacesuits for this purpose

  ঘ

  The gravity of the moon and earth cancel out at that altitude
• For an object experiencing weightlessness _____
  ক

  its weight force is non-zero

  খ

  it has inertia

  গ

  it experiences a value of acceleration greater than the acceleration due to gravity

  ঘ

  it experiences a value of acceleration lesser than the acceleration due to gravity
• A geostationary satellite cannot orbit in any plane other than the equatorial plane.
  ক

  True

  খ

  False
• Every geostationary satellite is a geosynchronous satellite.
  ক

  True

  খ

  False
• A geosynchronous satellite always appears fixed in the sky.
  ক

  True

  খ

  False
• The PSLV rockets of India launch satellites into the high-earth orbit.
  ক

  True

  খ

  False
• What is the angular velocity of parking satellites?
  ক

  pi/2 rad/hr

  খ

  pi/3 rad/hr

  গ

  pi/6 rad/hr

  ঘ

  pi/12 rad/hr
• How much is a polar orbit’s inclination with the earth’s equatorial plane?
  ক

  0 degrees

  খ

  45 degrees

  গ

  90 degrees

  ঘ

  180 degrees
• A polar orbit is ideal for a spy satellite.
  ক

  True

  খ

  False
• A geostationary satellite is orbiting the earth at a height of 4R above the earth’s surface. The time period of another satellite at a height of 2R is _____
  ক

  24 x (3/5)1/2 hr

  খ

  12 x (3/5)1/2 hr

  গ

  6 x (3/5)1/2 hr

  ঘ

  72 x (3/5)1/21 hr
• Polar satellites are used for high-resolution imaging of the earth’s surface because _____
  ক

  they have better cameras

  খ

  they are very high above the surface of the earth and travel slowly to gather more information

  গ

  they are closer to the surface of the earth and can cover vast areas very quickly

  ঘ

  they can be launched by most countries in the world
• Polar satellites are high altitude satellites.
  ক

  True

  খ

  False
• The height of the geostationary satellites above the earth’s surface is approximately 36,000 km.
  ক

  True

  খ

  False
• The radius of orbit of a geostationary satellite is given by _____ (M = Mass of the earth; R = Radius of the earth; T = Time period of the satellite) 3/2 b) 2/3 – R c) 1/3 – R d) 1/3
  ক

  3/2

  খ

  (T2*G*M)/(4*pi2)

  গ

  (T2*G*M)/(4*pi2)

  ঘ

  (T2*G*M)/(4*pi2)
• A geostationary satellite seems to be fixed in the sky because it does not orbit the earth.
  ক

  True

  খ

  False
• Most waves used for communication purposes rely on geostationary satellites because _____
  ক

  they cannot transmit data at long distances due to curvature of the earth

  খ

  they are reflected by the atmosphere

  গ

  they are very cheap

  ঘ

  it does not occupy space on the earth’s surface
• CARTOSAT is a group of geostationary satellites sent up by India.
  ক

  True

  খ

  False
• For a satellite executing an elliptical orbit around a planet, its minimum potential energy is at the perigee.
  ক

  True

  খ

  False
• If the kinetic energy of a satellite is halved, its orbital radius becomes _____
  ক

  1/2 times

  খ

  2 times

  গ

  4 times

  ঘ

  infinity
• Assume that a satellite executes perfectly circular orbits around a perfectly circular sphere. The work done by the satellite in 1 complete revolution is _____
  ক

  (1/2) x (G x m x M)/(R+h)

  খ

  – (G x m x M)/(R+h)

  গ

  – (1/2) x (G x m x M)/(R+h)

  ঘ

  0
• For a satellite with an elliptical orbit and not a circular orbit, the potential energy varies with time.
  ক

  True

  খ

  False
• For a satellite with an elliptical orbit and not a circular orbit, the kinetic energy varies with time.
  ক

  True

  খ

  False
• A satellite revolves around the earth in a circular orbit with a velocity “v”. What is the total energy of the satellite? Let “m” be the mass of the satellite.
  ক

  – (m*v2)/2

  খ

  (m*v2)/2

  গ

  (3*m*v2)/2

  ঘ

  – (m*v2)
• A satellite of mass “m” is in a circular orbit of radius 1.5R around the earth of radius R. How much energy is required to move it to an orbit of radius 2R?
  ক

  -(G*M*m)/12R

  খ

  (G*M*m)/12R

  গ

  -(G*M*m)/4R

  ঘ

  (G*M*m)/4R
• What is the magnitude of the ratio of KE and PE of a satellite revolving around a planet in a circular orbit of radius “R”?
  ক

  1:4

  খ

  1:2

  গ

  2:1

  ঘ

  3:2
• The only natural satellite of India is the moon.
  ক

  True

  খ

  False
• The orbital velocity of a satellite orbiting the earth is half the escape velocity of the earth. What is the height above the surface of the earth at which it is orbiting? (Let the radius of the earth (R) = 6400 km).
  ক

  6400 km

  খ

  3200 km

  গ

  9600 km

  ঘ

  4800 km