NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1971  1975 of 2184
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Question number: 1971
» Rotational Motion » Moment of Inertia
Question
Three rods each of length L and mass M are placed along X, Y and Z axis in such a way that one end of each of the rod is at the origin. The moment of inertia of this system about Z axis is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1972
» 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: 1973
» Rotational Motion » Moment of Inertia
Question
From a uniform wire, two circular loops are made (i) P of radius r and (ii) Q of radius nr. If the moment of inertia of loop Q about an axis passing through its center and perpendicular to its plane is 27 times that of P about a similar axis, the value of n is (diameter of the wire is very much smaller than r or nr)
Choices
Choice (4)  Response  

a.  3 

b.  2 

c.  6 

d.  4 

Question number: 1974
» 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: 1975
» Gravitation » Gravitational Acceleration
Question
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 true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is false but Ꭱ is true 

c.  Ꭺ is true but Ꭱ is false 

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