Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 31  34 of 233
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Question number: 31
» Kinematics » Frame of Reference
Question
if a particle travels a linear distance at speed v _{1} and comes back along the same track at speed v _{2}.
(1) Its average speed is arithmetic mean (v _{1} + v _{2}) / 2
(2) Its average speed is harmonic mean 2 v _{1} v _{2 } / (v _{1} + v _{2}) /2
(3) Its average speed is geometric mean √v _{1} v _{2}
(4) Its average velocity is zero
Choices
Choice (4)  Response  

a.  2 and 4 

b.  1 and 3 

c.  1, 2 and 3 

d.  1 and 2 

Question number: 32
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.
Reason (Ꭱ)
A body of all mass group travels under constant acceleration when only gravity acts on it.
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 false 

Question number: 33
» Kinematics » Motion in a Straight Line
Question
A particle moves along xaxis as x = 4 (t  3) + a (t  4) ^{2}
Which of the following is true?
Choices
Choice (4)  Response  

a.  The initial velocity of particle is 4 

b.  The particle is at origin at t = 0 

c.  The acceleration of particle is 2a 

d.  All of the above 

Question number: 34
» Kinematics » Motion in a Straight Line
Question
a particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is
Choices
Choice (4)  Response  

a.  5.0 m/s 

b.  5.5 m/s 

c.  4.8 m/s 

d.  4.0 m/s 
