NEET Physics: Questions 63 - 66 of 2099

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Question number: 63

» Kinematics » Frame of Reference

MCQ▾

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: 64

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

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: 65

» Physics and Measurement » Dimensions of Physical Quantities

MCQ▾

Question

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

Choices

Choice (4) Response
a.

T = k

ρr3/S1/2

b.

T = k

ρr3/S

c.

T = k

ρ1/2r3/S

d. None of the above

Question number: 66

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A particle moves along x-axis 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

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