NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 244  248 of 2144
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Question number: 244
Question
A child is standing with folded hands at the center of a platform rotating about its central axis. The kinetic energy of the system is K. The child now stretches his arms so that the moment of inertia of the system doubles. The kinetic energy of the system now is
(1) Less than 2K
(2) Equal to K/2
(3) More than K/4
(4) Equal to 4K
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1,2 and 3 are correct 

b.  2 and 4 are correct 

c.  1 and 3 are correct 

d.  1 and 2 are correct 

Question number: 245
» Properties of Solids & Liquids » Young's Modulus
Question
If x, y, p and q represent the increase in length, the original length of the experimental wire, load applied to the wire and area of crosssection of the wire respectively then Young’s modulus of the wire is given by
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 246
» Kinematics » Uniform and NonUniform Motion
Question
A body whose mass 6 kg is acted upon by two forces (8i + 10j) N and (4i + 8j) N. The acceleration produced will be (in m/s ^{2}) 
Choices
Choice (4)  Response  

a.  12i + 18j 

b.  (3i + 2j) 

c.  1/3 (G + 3) 

d.  2i + 3j 

Question number: 247
Question
A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 4Aq in 4 seconds. The magnitude of this torque is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Passage
Consider a cylinder of mass M = 1kg and radius R = 1 m lying on a rough horizontal plane. It has a plank lying on its top as shown in the figure.
A force F = 55 N is applied on the plank such that the plank moves and causes the cylinder to roll. The plank always remains horizontal. There is no slipping at any point of contact.
Question number: 248 (1 of 3 Based on Passage) Show Passage
» Rotational Motion » Angular Momentum
Question
Find the value of frictional force at A
Choices
Choice (4)  Response  

a.  2.5 N 

b.  7.5 N 

c.  5.0 N 

d.  None of the above 
