Q.1
When the mass of the objects increases the gravitational force between them
  • decreases
  • increases
  • no change
  • Both A & B
Q.2
Who proposed Earth centered model?
  • Copernicus
  • Ptolemy
  • Kepler
  • Tycho Brahe
Q.3
Types of celestial coordinate system
  • Latitude and longitude
  • Ecuatorial and horizontal
  • None
  • All of above
Q.4
What family is he from?
  • His parents was poor
  • He didn't have a family
Q.5
What is the second law of Kepler ?
  • All planets move around the Sun in elliptical orbits, with the Sun as one focus of the ellipse.
  • The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
  • The radius vector of a planet sweeps over in equal areas in equal intervals of time.
  • None of these
Q.6
What is the third law of Kepler
  • The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
  • None
Q.7
What is the line connecting the sun and planet
  • Line
  • Area
  • Imagine
  • Radius vector
Q.8
Firs law of Kepler?
  • None
  • The orbit of planet is an ellipse with the Sun at one of the two foci
  • The radius vector of a planet sweeps over equal areas in equal time intervals of time.
  • The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit
Q.9
If r represents the radius of the orbit of a satellite of mass m moving round a planet of mass M the velocity of the satellite is given by
  • v2 = GMmrv^2\ =\ \frac{GMm}{r}v2 = rGMm​
  • v2 = gMRv^2\ =\ \frac{gM}{R}v2 = RgM​
  • v=\frac{GMm}{r^2} v= r 2 GMm ​
  • V= ( r GM ​ ) ​
Q.10
What is the reason for the motion of the moon on its orbit?
  • The gravitational force exerted by the sun
  • The gravitational force exerted on the Moon by the earth
Q.11
What is the correct formula to calculate eccentricity?
  • Focal distance / major axis length
  • major axis length / minor axis length
  • minor axis length / major axis length
  • All of above
Q.12
The factors that can determine the force between two objects include all of the following except
  • distance between the 2 objects
  • diameter of the objects
Q.13
Where are the focal points located in a perfect circle?
  • close together
  • on top of each other
Q.14
What will result in the most eccentric elliptical orbit
  • when the focal points are on top of one another
  • then the focal points are farthest apart
  • when the focal points are closest together
  • All of above
Q.15
What is the name of the backward motion of planets that cannot be explained by the geocentric model?
  • retrograde motion
  • revolutionary motion
Q.16
Which model of the solar system can explain all observations
  • geocentric model
  • heliocentric model
Q.17
What is it called when earth reaches the point in orbit when it is farthest from the sun?
  • Perihelion
  • Aphelion
Q.18
Earth will travel fastest in its orbit when
  • the earth is closest to the sun (January 3rd)
  • The earth is closest to the sun (July 3rd)
Q.19
Which statement correctly describes when the earth is closest to the sun
  • It is called perihelion and it occurs on July 3rd
  • It is called aphelion and it occurs on July 3rd
  • It is called perihelion and it occurs on January 3rd
  • None of these
Q.20
The planet with the most eccentric orbit is
  • Venus
  • Mars
  • Earth
  • Mercury
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