NEET Physics: Questions 180 - 183 of 2098

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Question number: 180

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The angular velocity of a particle is given by co = 5t - 3t 2 + 1, the time when its angular acceleration decreases to be zero will be -

Choices

Choice (4) Response

a.

0.25 sec

b.

1.2 sec

c.

0.83 sec

d.

25 sec

Question number: 181

» Laws of Motion » Centripetal Force

Assertion-Reason▾

Assertion (Ꭺ)

If net force F acting on a system is changing in direction only, the linear momentum (p) of system changes in direction.

Reason (Ꭱ)

In case of uniform circular motion, magnitude of linear momentum is constant but direction of centripetal force changes at every instant. You have to select the correct choice.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

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

Question number: 182

» Kinematics » Uniform Circular Motion

MCQ▾

Question

A particle revolving in a circular path completes first one third of circumference in 2 sec, while next one third in 1 sec. The average angular velocity of particle will be - (in Rad/sec)

Choices

Choice (4) Response

a.

π/3

b.

2π/3

c.

4π/3

d.

5π/3

Question number: 183

» Kinematics » Motion in a Plane

MCQ▾

Question

A projectile is thrown at an angle 0 and (90° - 0) from the same point with same velocity 98 m/s. The heights attained by them, if the difference of heights is 50 m will be (in m)

Choices

Choice (4) Response

a.

270, 220

b.

200, 150

c.

250, 200

d.

300, 250

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