Rotational Motion (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 22  26 of 125
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Question number: 22
» Rotational Motion » Torque
Question
An automobile engine develops 100 kW when rotating at a speed of 1800 rev/min. What torque does it deliver?
Choices
Choice (4)  Response  

a.  350 Nm 

b.  440 Nm 

c.  628 Nm 

d.  531 Nm 

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Question number: 23
» Rotational Motion » Angular Momentum
Question
A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle’s motion is doubled and its kinetic energy is halved, the angular momentum becomes.
Choices
Choice (4)  Response  

a.  L/2 

b.  4 L 

c.  L/4 

d.  2 L 

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Question number: 24
» Rotational Motion » Torque
Question
A torque of 30 Nm is applied on a 5 kg wheel whose moment of inertia is 2kgm ^{2} for 10 sec. The angle covers by the wheel in 10 sec will be
Choices
Choice (4)  Response  

a.  6000 rad 

b.  750 rad 

c.  1500 rad 

d.  3000 rad 

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Question number: 25
» Rotational Motion » Torque
Assertion (Ꭺ)
Torque due to force is maximum when angle between r and F is 90°.
Reason (Ꭱ)
The unit of torque is newton meter.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Ꭺ is true but Ꭱ is 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 

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Question number: 26
» Rotational Motion » Angular Momentum
Question
If the earth is a point mass of 6 x l0 ^{24 } kg revolving around the sun at a distance of 1.5xl0 ^{8} km and in time T = 3.14 xl0 ^{7} s. Then the angular momentum of the earth around the sun is
Choices
Choice (4)  Response  

a.  1.8 x 10 ^{29} kg m ^{2} /s 

b.  2.7 x 10 ^{40} kg m ^{2} /s 

c.  1.5 x 10 ^{37} kg m ^{2} /s 

d.  1.2 x 10 ^{18} kg m ^{2} /s 

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