# NEET Physics: Questions 871 - 874 of 2142

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## Question number: 871

MCQ▾

### Question

The work done in lifting water from a well of depth 6 m using a bucket of mass 0.8 kg and volume 1 liter, will be

### Choices

Choice (4) Response

a.

147 J

b.

73.5 J

c.

105.84 J

d.

98 J

## Question number: 872

Assertion-Reason▾

### Assertion (Ꭺ)

A particle moves along a straight line with constant velocity. Now a constant non-zero force is applied on the particle in direction opposite to its initial velocity. After the force is applied, the net work done by this force may be zero in certain time intervals.

### Reason (Ꭱ)

The work done by force acting on a particle is zero in any time interval if the force is always perpendicular to velocity of the particle.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

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

## Question number: 873

MCQ▾

### Question

A body of mass 60 kg is pulled by a rope of length 8 m on a surface by a force of 128N applied at the other end. The force that is acting on 60 kg mass, if the linear density of rope is 0.5 kg/m will be –

### Choices

Choice (4) Response

a.

128 N

b.

116 N

c.

120 N

d.

92 N

## Question number: 874

MCQ▾

### Question

Block A weighs 4 N and block B weighs 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. Find the force F to slide B at a constant speed when A and B are connected by a light cord passing over a smooth Pulley.

### Choices

Choice (4) Response

a.

5N

b.

3N

c.

2N

d.

6N

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