NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 254  258 of 2320
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Question number: 254
Question
A constant torque of 700 N m, turns a wheel of moment of inertia 50 kg m ^{2} about an axis passing through the center. Angular velocity of the wheel after 2 s will be
Choices
Choice (4)  Response  

a.  15 rad/s  
b.  5 rad/s  
c.  1 rad/s  
d.  28 rad/s 
Question number: 255
» Electrostatics » Electrostatic Potential Energy
Question
Charges q, Q and q are placed at equal distance on a straight line. If the total potential energy of the system of three charges is zero, then find the ratio Q/q.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 256
» Electrostatics » Electric Field Due to a Point Charge
Question
Two point charges Q and 3 Q are placed at some distance apart. If the electric field at the location of Q is E then, what will be at the locality of 3Q?
Choices
Choice (4)  Response  

a. 
 
b.  3E  
c. 
 
d.  E 
Question number: 257
» Rotational Motion » Angular Momentum
Question
Two discs of moment of inertia 1 _{1} and I _{2} and angular speeds _{1} and _{2} are rotating along collinear axes passing through their center of mass and perpendicular to their plane. If the two are made to rotate combined along the same axis the rotational KE of system will be
Choices
Choice (4)  Response  

a.  v  
b. 
 
c. 
 
d.  None of the above 
Question number: 258
» Kinematics » Average Speed and Instantaneous Velocity
Question
A cricket ball of mass 150 g is moving with a velocity of 12m/sec and is hit by a bat so that the ball is turned back with a velocity of 20 m/sec; the force on the ball acts for 0.01 sec, then the average force exerted by the bat on the ball will be
Choices
Choice (4)  Response  

a.  480 N  
b.  40 N  
c.  400 N  
d.  48 N 