# NEET Physics: Questions 141 - 144 of 2142

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## Question number: 141

MCQ▾

### Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 10 m with a speed of 20 m/sec. The acceleration of the ball will be -

### Choices

Choice (4) Response

a.

30 m/s 2

b.

10 m/s 2

c.

20 m/s 2

d.

40 m/s 2

## Question number: 142

Assertion-Reason▾

### Assertion (Ꭺ)

Two projectiles are launched from the top of a cliff with same initial speed with different angles of projection. They reach the ground with the same speed

### Reason (Ꭱ)

The work done by gravity is same in both the cases.

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

## Question number: 143

MCQ▾

### Question

A ball is projeced from O with an initial velocity 700 cm/s in a direction 37° above the horizontal. A ball B, 500 cml away from O on the line of the initial velocity of A, isl released from rest at the instant A is projected. The height! through which B falls, before it is hit by A and the directionl of the velocity A at the time of impact will respectively bel [given g = 10 m/s2, sin 37° = 0.6 and cos 37° = 8.0]

### Choices

Choice (4) Response

a.

245 cm, 20° 44

b.

300 cm, 27° 43

c.

255 cm, 27° 43

d.

250 cm, 28° 42

## Question number: 144

MCQ▾

### Question

The ratio of angular speeds of minute hand and hour hand of a watch is -

### Choices

Choice (4) Response

a.

6: 1

b.

1: 6

c.

1: 12

d.

12: 1

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