# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 124 - 128 of 2142

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## Question number: 124

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

### Question

What is the value of linear velocity, if co = 3i -4j + k and r = 5i - 6j + 6k

### Choices

Choice (4) Response

a.

-18 - 13 + 2

b.

6 - 2 + 8

c.

4 - 13 + 6

d.

6 - 2 + 3

## Question number: 125

MCQ▾

### Question

As shown in figure the tension in the horizontal cord is 30 N. The weight Wand tension in the string OA in newton are

In above fig we show that tension acting on the cube of weight w and and tension in horizontal cord is 30 N.

### Choices

Choice (4) Response

a.

30

, 60

b.

30

, 90

c.

30

, 30

d.

None of the above

## Question number: 126

MCQ▾

### Question

A force (where K is a positive constant) acts on a particle moving in the x-y plane. Starting from the origin, the particle is taken along the positive x-axis to the point (a, 0) and then parallel to the y-axis to the point

(a, a). The total work done by the forces F on the particle is

### Choices

Choice (4) Response

a.

2Ka 2

b.

Ka 2

c.

-Ka 2

d.

-2Ka 2

## Question number: 127

MCQ▾

### Question

A man crosses a 320 m wide river perpendicular to the current in 4 minutes. If in still water he can swim with a speed 5/3 times that of the current, then the speed of the Current in m/min is

### Choices

Choice (4) Response

a.

40

b.

30

c.

50

d.

60

## Question number: 128

MCQ▾

### Question

The length of second’s hand in watch is 1 cm. The change in velocity of its tip in 15 seconds is

### Choices

Choice (4) Response

a.

zero

b.

cm/sec

c.

cm/sec

d.

cm/sec

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