# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1717 - 1721 of 2142

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

## Passage

Sound from a point isotropic source spreads equally in all directions in homogeneous medium. Therefore its intensity decreases with square of distance from the source. When distance between observer and the source changes, apart from changes in intensity, the observer listens sound of pitch higher or lower than actual pitch depending upon the fact that the distance between the observer and source is decreasing or increasing respectively. An observer O is at a distance 2R from center of a circle of radius R. A point isotropic sound source S moves on the circle with uniform angular velocity . Initially observer, source and Centre of the circle are in same line.

## Question number: 1717 (3 of 3 Based on Passage) Show Passage

MCQ▾

### Question

Starting from initial moment, the source moves through an angular displacement 180°. Intensity of the sound as observed by the observer decreases by a factor of –

### Choices

Choice (4) Response

a.

9

b.

4

c.

2

d.

3

## Question number: 1718

» Oscillations and Waves » Simple Harmonic Motion » Force, Velocity, and Acceleration

Assertion-Reason▾

### Assertion (Ꭺ)

Consider motion for a mass spring system under gravity, motion of M is not a simple harmonic motion unless Mg is negligibly small.

### Reason (Ꭱ)

For simple harmonic motion acceleration must be proportional to displacement and is directed towards the mean position.

### Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

## Question number: 1719

MCQ▾

### Question

A tuning fork makes 256 vibrations per second in air. When the velocity of sound is 330 m/s then wavelength of the tone emitted is

### Choices

Choice (4) Response

a.

0.89 m

b.

1.11 m

c.

0.56 m

d.

1.29 m

## Question number: 1720

» Oscillations and Waves » Simple Harmonic Motion » Oscillations of a Spring

MCQ▾

### Question

A ball of the mass 10 kg hangs from a spring and oscillates with time period of 2 π seconds. If the ball is removed the spring shortens by,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1721

MCQ▾

### Question

The path difference between the two waves and is

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page