Kinematics (NEET Physics): Questions 31  34 of 233
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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 
