NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 137 - 142 of 2142

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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 t = 0 to t = t will be –

Choices

Choice (4) Response

a.

- +

b.

-

c.

d.

All of the above

Question number: 139 (2 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: 140 (3 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.

-

b.

- +

c.

d.

None 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

Question number: 142

» Kinematics » Average Speed and Instantaneous Velocity

Assertion-Reason▾

Assertion (Ꭺ)

Two projectiles are launched from the top of a cliff with same initial speed with different angles of projection. They reach the ground with the same speed

Reason (Ꭱ)

The work done by gravity is same in both the cases.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

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

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

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