NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 1991  1995 of 2142
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Question number: 1991
» Rotational Motion » Values of Moments of Inertia
Question
A constant torque of 62.8 Nm is exerted on a pivoted wheel. If angular acceleration of wheel is 5π rad/sec ^{2}, then the moment of inertia of the wheel is
Choices
Choice (4)  Response  

a.  3 kgm ^{2} 

b.  3.5 kgm ^{2} 

c.  4 kgm ^{2} 

d.  4.5 kgm ^{2} 

Question number: 1992
» Rotational Motion » Moment of Inertia
Assertion (Ꭺ)
If earth shrink (without change in mass) to half of its present size, length of the day would become 6 % increase.
Reason (Ꭱ)
When the size of the earth will change, its moment of inertia will also change.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

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

c.  Ꭺ is true but Ꭱ is false 

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

Question number: 1993
» Gravitation » Gravitational Acceleration
Question
If the value of ‘g’ at a height h above the surface of the earth is the same as at a depth x below it, then (both x and h being much smaller than the radius of the earth)
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1994
» Gravitation » Gravitational Acceleration
Question
What would be the angular speed of earth, so that bodies lying on equator may experience weightlessness? (g = 10 m/s ^{2} and radius of earth = 6400 km)
Choices
Choice (4)  Response  

a.  1.25 ⨯ 10 ^{2} rad/sec 

b.  1.25 ⨯ 10 ^{1} rad/sec 

c.  1.25 ⨯ 10 ^{4} rad/sec 

d.  1.25 ⨯ 10 ^{3} rad/sec 

Question number: 1995
» Gravitation » Universal Law of Gravitation
Assertion (Ꭺ)
Gravitational force between two particles is negligibly small compared to the electrical force.
Reason (Ꭱ)
The electrical force is experienced by charged particles only.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

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

c.  Ꭺ is true but Ꭱ is false 

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