Kinematics (NEET Physics): Questions 68 - 72 of 229

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Question number: 68

» Kinematics » Motion in a Plane

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

Tension on the weight

Tension on the Weight

Tension on the weight

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

3

, 60

b.

30

3

, 90

c.

30

3

, 30

d.

None of the above

Question number: 69

» Kinematics » Motion in a Plane

MCQ▾

Question

A force F=K(yi^+xj^) (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: 70

» Kinematics » Velocity-Time Graphs

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: 71

» Kinematics » Average Speed and Instantaneous Velocity

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.

π230 cm/sec

c.

π302 cm/sec

d.

π30 cm/sec

Question number: 72

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A person aiming to reach the exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120° with the direction of flow of water. The speed of water in the stream is

Choices

Choice (4) Response

a.

lm/s

b.

0.433 m/s

c.

0.25 m/s

d.

0.5 m/s

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