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

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: 32

» 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: 33

» 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

Question number: 34

» Kinematics » Motion in a Straight Line

MCQ▾

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

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