# NEET Physics: Questions 168 - 172 of 2142

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## Question number: 168

MCQ▾

### Question

A ball is thrown horizontally from a height of 20 m. It hits) the ground with a velocity three times its initial velocity. The initial velocity of ball is

### Choices

Choice (4) Response

a.

3 m/s

b.

5 m/s

c.

7 m/s

d.

2 m/s

## Question number: 169

MCQ▾

### Question

A particle is projected with a velocity u so that its horizontal range is twice the maximum height attained. The horizontal range is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 170

MCQ▾

### Question

A grind stone starts from rest and has a constant-angular acceleration of 6.0 rad/sec2. The angular displacement and angular velocity, after 4 sec. will respectively be

### Choices

Choice (4) Response

a.

b.

c.

d.

## Passage

The velocity of the particle changes moving on the curved path, this change in velocity is brought by a force known as centripetal force and the acceleration so produced in the body is known as centripetal acceleration. The direction of centripetal force or acceleration is always towards the center of circular path.

## Question number: 171 (1 of 1 Based on Passage) Show Passage

MCQ▾

### Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 5 m with a speed of 10 m/sec. The acceleration of the ball will be -

### Choices

Choice (4) Response

a.

40 m/s 2

b.

10 m/s 2

c.

20 m/s 2

d.

30 m/s 2

## Question number: 172

MCQ▾

### Question

A particle describes a horizontal circle on the smooth surface of an inverted cone. The height of the plane of the circle above the vertex is 9.8 cm, then choose the correct options

(1) The speed of the particle will be 0.98 m/s

(2) tan 0 = rg/v 2 (6 is semi-apex angle)

(3) The speed of the particle will be 98 m/s

(4) tan 9 = rg/v (0 is semi apex angle)

### Choices

Choice (4) Response

a.

1 and 3

b.

1, 2 and 3

c.

1 and 2

d.

2 and 4

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