# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 63 - 66 of 2184

Access detailed explanations (illustrated with images and videos) to 2184 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. Subscription can be renewed yearly absolutely FREE! View Sample Explanation or View Features.

Rs. 550.00 or

How to register?

## Question number: 63

Edit
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.

1 and 2

b.

1,2 and 3

c.

2 and 4

d.

1 and 3

## Question number: 64

Edit
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.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

## Question number: 65

Edit
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

b.

T = k

c.

T = k

d.

Question does not provide sufficient data or is vague

## Question number: 66

Edit
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 acceleration of particle is 2a

c.

The particle is at origin at t = 0

d.

None of the above