Gravitation (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SBSX (Class 12 & 1st Year B.Sc.) Physics): Questions 1  4 of 7
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Question number: 1
» Gravitation » Kepler's Laws of Planetary Motion
Appeared in Year: 2010
Question
A comet (assumed to be in an elliptical orbit around the sun) is at a distance of 0.4 AU from the sun at the perihelion. If the time period of the comet is 125 years, what is the aphelion distance? AU: Astronomical Unit.
Choices
Choice (4)  Response  

a.  24.6 AU 

b.  25 AU 

c.  49.6 AU 

d.  50 AU 

Question number: 2
» Gravitation » Universal Law of Gravitation
Appeared in Year: 2010
Question
A certain planet completes one rotation about its axis in time T. The weight of an object placed at the equator on the planet’s surface is a fraction f (f is close to unity) of its weight recorded at a latitude of 60^{0}. The density of the planet assumed to be a uniform perfect sphere is given by –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 3
» Gravitation » Orbital Velocity of a Satellite
Appeared in Year: 2012
Question
A small asteroid is orbiting around the sun in a circular orbit of radius r_{0} with speed V_{0}. A rocket is launched from the asteroid with speed V = αV_{0}, where V_{0} is the speed relative to the sun. The highest value of α for which the rocket will remain bound to the solar system is (ignoring gravity due to the asteroid and effects of other planets) –
Choices
Choice (4)  Response  

a. 


b. 


c.  1 

d. 


Question number: 4
» Gravitation » Escape Velocity
Question
If the escape velocity from the earth is about, then the escape velocity from a planet having twice the radius and the same mean density as the earth is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

