Rotational Motion (NEET 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 

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 

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 

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 

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 
