Gravitation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 60  64 of 84
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Question number: 60
» Gravitation » Energy
Question
With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 7 Re? Earth’s mass M = 6 ⨯ 10 ^{24} kg, radius R _{e} = 6.4 ⨯ 10 ^{6} m and G = 6.67 ⨯ 10 ^{11} Nm ^{2} /kg ^{2}.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 61
» Gravitation » Gravitational Acceleration
Question
What will be the acceleration due to gravity on the surface of the moon if its radius is th the radius of the earth and its mass is th the mass of the earth
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 62
» Gravitation » Gravitational Acceleration
Assertion (Ꭺ)
There is no effect of rotation of earth on the value of acceleration due to gravity at poles.
Reason (Ꭱ)
Rotation of earth is about polar axis.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Ꭺ is false but Ꭱ is true 

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

d.  Ꭺ is true but Ꭱ is false 

Question number: 63
» Gravitation » Gravitational Acceleration
Question
At what height above the earth’s surface the acceleration due to gravity will be of its value at the earth’s surface? (Radius of earth is 6400 km)
Choices
Choice (4)  Response  

a.  128 km 

b.  128000 km 

c.  1280 km 

d.  12800 km 

Question number: 64
» Gravitation » Universal Law of Gravitation
Question
The gravitational force between two point masses m _{1} and m _{2} at separation r is given by
The constant k doesn’t
(1) Depend on medium between masses
(2) Depend on the place
(3) Depend on time
(4) Depend on system of units
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  1, 2 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 3 are correct 
