Kinematics (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 27  31 of 233
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Question number: 27
» Kinematics » Motion in a Straight Line
Question
A particle moves along xaxis with acceleration a = a _{0} (1 –t/T) where a _{0} and T are constants if velocity at t = 0 is zero then find the average velocity from t = 0 to the time when a = 0.
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 28
» Kinematics » Motion in a Straight Line
Question
A body falls from a height h = 200 m. The ratio of distance travelled in each 2 second during t = 0 to t = 6 second of the journey is
Choices
Choice (4)  Response  

a.  1: 2: 3 

b.  1: 4: 9 

c.  1: 3: 5 

d.  1: 2: 4 

Question number: 29
» Kinematics » Motion in a Straight Line
Question
A stone is dropped from a miner of height h and it reaches after t seconds on earth. From the same miner if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t _{1} and t _{2} seconds respectively, then
Choices
Choice (4)  Response  

a.  t = 

b.  t = 

c.  t = 

d.  t = t _{1}  t _{2 } 

Question number: 30
» Kinematics » Motion in a Straight Line
Assertion (Ꭺ)
Displacement of a body may be zero when distance travelled by it is not zero.
Reason (Ꭱ)
The displacement is the longest distance between initial and final position.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Ꭺ is false but Ꭱ is true 

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

d.  Both Ꭺ and Ꭱ are false 

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 
