NEET Physics: Questions 135 - 139 of 2099

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Question number: 135

» Kinematics » Motion in a Straight Line

MCQ▾

Question

A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong?

 metal sphere fixed at wall

Metal Sphere Fixed at Wall

metal sphere fixed at wall

In above fig we shows that metal sphere fixed at the wall, as we apply some force on it then motion is taking place, here angle is θ .

Choices

Choice (4) Response
a.

T + P + W = 0

b.

T 2 + P 2 + W 2 = 0

c.

T2 = P2 + W2

d.

p = w tanθ

Question number: 136

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

the vector P = ai + aj + 3k and Q = ai - 2j - k are perpendicular to each other. The positive value of a is

Choices

Choice (4) Response
a.

4

b.

9

c.

3

d.

13

Question number: 137

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

A particle moves from position 3i + 2j-6k to 14i + 13j + 9k due to a uniform force of (4i + j + 3k) N. If the displacement in metres then work done will be

Choices

Choice (4) Response
a.

250 J

b.

300 J

c.

100 J

d.

200 J

Question number: 138

» Kinematics » Scalars and Vectors » Scalar and Vector Products

MCQ▾

Question

If|AxB|=| A. B| , then angle between A and S will be

Choices

Choice (4) Response
a.

30

b.

60°

c.

45°

d. None of the above

Passage

A particle moves along x-axis and its acceleration at any time t is a = 2 sin (πt), where t is in seconds and a is in m/s 2. The initial velocity of particle (at time t = 0) is u = 0.

Question number: 139 (1 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

MCQ▾

Question

The magnitude of displacement (in meters) by the particle from time t = 0 to t = t will be –

Choices

Choice (4) Response
a.

2π2 sinπt - 2tπ

b.

- 2π2 sinπt + 2tπ

c.

2tπ

d. None of the above

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