KinematicsUniformly Accelerated Motion (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 1  5 of 23
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Question number: 1
» Kinematics » Uniformly Accelerated Motion
Question
The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t –t ^{3} during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –
Choices
Choice (4)  Response  

a.  2 rad/sec 

b.  1 rad/sec 

c.  3 rad/sec 

d.  4 rad/sec 

Question number: 2
» Kinematics » Uniformly Accelerated Motion
Question
The shaft of an electric motor starts from rest and on the application of a torque, it gains an angular acceleration given by a = 3t –t ^{2} during the first 2 seconds after it starts after which a = 0. The angular velocity after 6 sec will be –
Choices
Choice (4)  Response  

a.  3/10 rad/sec 

b.  4/30 rad/sec 

c.  10/3 rad/sec 

d.  30/4 rad/sec 

Question number: 3
» Kinematics » Uniformly Accelerated Motion
Question
Using rectangular coordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) 
Choices
Choice (4)  Response  

a.  2r ^{2 } 

b.   ^{2} r 

c. 


d.  r ^{2} 

Question number: 4
» Kinematics » Uniformly Accelerated Motion
Question
The angular velocity of a particle is given by co = 1.51  3t ^{2} + 2, the time when its angular acceleration decreases to be zero will be 
Choices
Choice (4)  Response  

a.  0.25 sec 

b.  25 sec 

c.  1.2 sec 

d.  12 sec 

Question number: 5
» Kinematics » Uniformly Accelerated Motion
Assertion (Ꭺ)
In nonuniform circular motion, velocity vector and acceleration vector are not perpendicular to each other.
Reason (Ꭱ)
In nonuniform circular motion, particle has normal as well as tangential acceleration.
Choices
Choice (4)  Response  

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

b.  Ꭺ is true but Ꭱ is false 

c.  Ꭺ is false but Ꭱ is true 

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