NEET Physics: Questions 1955  1959 of 2142
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Question number: 1955
» Rotational Motion » Moment of Inertia
Question
Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The densities of the materials are in the ratio 1: 3. The ratio of the moments of inertia of these discs about the respective axes passing through their centers and perpendicular to their planes will be in,
Choices
Choice (4)  Response  

a.  9: 1 

b.  3: 1 

c.  1: 9 

d.  1: 3 

Question number: 1956
» Gravitation » Energy
Question
If g is the acceleration due to gravity on the earth’s surface the gain in P. E. of an object of mass m raised from the surface of the earth to a height of the radius R of the earth is 
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1957
» Gravitation » Universal Law of Gravitation
Question
What is the mass of the planet that has a satellite whose time period is T and orbital radius is r?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1958
» Gravitation » Orbital Velocity of a Satellite
Question
The speed with which the earth have to rotate on its axis so that a person on the equator would weigh the as much as present will be  (Take the equatorial radius as 6400 km. )
Choices
Choice (4)  Response  

a.  7.28 ⨯ 10 ^{3} rad/sec 

b.  9.35 ⨯ 10 ^{4} rad/sec 

c.  3 28 ⨯ 10 ^{3} rad/sec 

d.  5.53 ⨯ 10 ^{4} rad/sec 

Question number: 1959
» Rotational Motion » Values of Moments of Inertia
Question
A long rod has a mass of 0.12 kg and length of 1 m. The moment of inertia about an axis passing through the center and perpendicular to the length of rod will be
Choices
Choice (4)  Response  

a.  0.01 kgm ^{2} 

b.  1 kgm ^{2} 

c.  10 kgm ^{2} 

d.  0.001 kgm ^{2} 
