NEET Physics: Questions 135 - 141 of 2098

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Question number: 135

» 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: 136

» 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: 137

» 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: 138 (1 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

MCQ▾

Question

the distance travelled (in meters) by the particle from time to t = 0 to t = 1 is will be-

Choices

Choice (4) Response

a.

4/π

b.

2/π

c.

1/π

d.

None of the above

Question number: 139 (2 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

Question number: 140 (3 of 3 Based on Passage) Show Passage

» Kinematics » Motion in a Straight Line

MCQ▾

Question

The distance travelled (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.

All of the above

Question number: 141

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A ball is fixed to the end of a string and is rotated in a horizontal circle of radius 10 m with a speed of 20 m/sec. The acceleration of the ball will be -

Choices

Choice (4) Response

a.

30 m/s 2

b.

10 m/s 2

c.

20 m/s 2

d.

40 m/s 2

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