NEET Physics: Questions 271 - 275 of 2098

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Question number: 271

» Rotational Motion » Torque

Assertion-Reason▾

Assertion (Ꭺ)

It is harder to open and shut the door if we apply force near the hinge.

Reason (Ꭱ)

Torque is maximum at hinge of the door.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

Question number: 272

» Kinematics » Average Speed and Instantaneous Velocity

MCQ▾

Question

A body of mass 2 kg is moving along x-defection with a velocity of 2 m/sec. If a force of 4 N is applied on it along y-direction for 1 sec, the final velocity of particle will be -

Choices

Choice (4) Response

a.

2√2 m/s

b.

√2m/s

c.

1/√2 m/s

d.

1/2√2 m/s

Question number: 273

» Kinematics » Uniform and Non-Uniform Motion

MCQ▾

Question

A force of ( 5i^+7j^ ) N acted on a body of mass 20 kg. The displacement after 20 sec, if it starts from rest, will be -

Choices

Choice (4) Response

a.

100 m along tan143 with x axis

b.

200 m along tan143 with x axis

c.

500 m along tan143 with x axis

d.

Question does not provide sufficient data or is vague

Question number: 274

» Electrostatics » Electric Potential

MCQ▾

Question

A particle A has charge +q and a particle B has charge +4q with each of them having the same mass m. When allowed to fall from rest through the same electric potential difference, the ratio of their speed VAVB will become

Choices

Choice (4) Response

a.

1: 2

b.

4: 1

c.

2: 1

d.

1: 4

Question number: 275

» Rotational Motion » Torque

MCQ▾

Question

Find the torque of a force F =- i + 2 j + 3 k acting at the point r = i + 3 j + 5k

Choices

Choice (4) Response

a.

-21i + 3j + 5k

b.

-i - 8j + 5k

c.

14i - 38j + 16k

d.

7i - 19j + 19k

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