# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 131 - 134 of 2184

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## Question number: 131

Edit
MCQ▾

### Question

A man can swim with velocity v relative to water. He has to cross a river of width d flowing with a velocity u (w > v). The distance through which he is carried downstream by the river is x. Which of the following statements is correct?

### Choices

Choice (4) Response

a.

x cannot be less than du/v

b.

If he crosses the river in minimum time x = du/v

c.

x will be maximum if he swims in a direction making

an angle of π/2 + sin-1 - 1 (v/u) with direction of the flow of water.

d.

Force to be minimum he has to swim in a direction making an angle

of π/2- sin -1 (v/u) with the direction of the flow of water.

## Question number: 132

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Edit
Assertion-Reason▾

### Assertion (Ꭺ)

If|A + B|=| A-B|, then angle between A and B is 90°

A + B = B + A

### Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

## Question number: 133

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Edit
MCQ▾

### Question

The three vectors A = 3i - 2j - k, B = i - 3j + 5k and C = 2i - j - 4k does not form

(1) an equilateral triangle

(2) isosceles triangle

(3) a right angled triangle

(4) no triangle

### Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 3 are correct

## Question number: 134

» Kinematics » Scalars and Vectors » Scalar and Vector Products

Edit
MCQ▾

### Question

A boy walks uniformly along the sides of a rectangular park of size 400 m x 300 m, starting from one corner to the other corner diagonally opposite. Which of the following statements is correct?

(1) He has travelled a distance of 700 m

(2) His displacement is 500 m

(3) His velocity is not uniform throughout the walk

(4) His displacement is 700 m

### Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct