# Kinematics (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 179 - 182 of 233

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## Question number: 179

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

### Question

A fire man has to carry an injured person of mass 30 kg from the top of a building with the help of the rope which can withstand a load of 150 kg. The acceleration of the

Fireman if his mass is 50 kg, will be

### Choices

Choice (4) Response

a.

17.97 m/s 2

b.

9.8 m/s 2

c.

8.575 m/s 2

d.

2.63 m/s 2

## Question number: 180

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

### Assertion (Ꭺ)

A river is flowing from east to west at a speed of 5m/min. A man on south bank of river, capable of swimming 10 m/min in still water, wants to swim across the river in shortest time. He should swim due north.

### Reason (Ꭱ)

For the shortest time the man needs to swim perpendicular to the bank.

### Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

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

c.

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

d.

Both Ꭺ and Ꭱ are false

## Question number: 181

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

### Question

A disc of mass 10 gm is kept horizontally in air by firing bullets of mass 5 g each at the rate of 10/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –

### Choices

Choice (4) Response

a.

147 cm/s

b.

49 cm/s

c.

196 cm/s

d.

98 cm/s

## Question number: 182

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

### Assertion (Ꭺ)

The relative velocity between any two bodies moving in opposite direction is equal to sum of the velocities of two bodies.

### Reason (Ꭱ)

Sometimes relative velocity between two bodies is equal to difference in velocities of the two.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

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

c.

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

d.

Ꭺ is true but Ꭱ is false

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