NEET Physics: Questions 63 - 66 of 2099
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Question number: 63
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
2 and 4
1 and 3
1, 2 and 3
1 and 2
Question number: 64
The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.
A body of all mass group travels under constant acceleration when only gravity acts on it.
|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: 65
If the time period (T) of vibration of a liquid drop depends on surface tension (S), radius (r) of the drop and density (ρ) of the liquid, then the expression of T is
T = k
T = k
T = k
|d.||None of the above|
Question number: 66
A particle moves along x-axis as x = 4 (t - 3) + a (t - 4) 2
Which of the following is true?
The initial velocity of particle is 4
The particle is at origin at t = 0
The acceleration of particle is 2a
|d.||All of the above|