Gravitation (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 28  31 of 84
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Question number: 28
» Gravitation » Kepler's Laws of Planetary Motion
Question
The semimajor axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?
Choices
Choice (4)  Response  

a.  1.73 years 

b.  1.23 years 

c.  3.24 years 

d.  1.95 years 

Question number: 29
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 5.8 ⨯ 10 ^{6} meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec ^{2})
Choices
Choice (4)  Response  

a.  7.5 km/sec, 8.0 minutes 

b.  2.7 km/sec, 8.51 minutes 

c.  7.75 km/sec, 80.51 minutes 

d.  7.5 km/sec, 80.51 minutes 

Question number: 30
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite has to revolve round the earth in a circular orbit of radius 6 ⨯ 10 ^{3} km. The velocity of projection of the satellite in this orbit will be 
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 31
» Gravitation » Orbital Velocity of a Satellite
Assertion (Ꭺ)
The speed of revolution of an artificial satellite revolving very near the earth is 8 kms ^{1}.
Reason (Ꭱ)
Orbital velocity of a satellite, become independent of height of near satellite.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Both Ꭺ and Ꭱ are false 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 
