NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 269 - 272 of 2184

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Question number: 269

» Kinematics » Average Speed and Instantaneous Velocity

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MCQ▾

Question

A lady is walking on a level road at a speed of 8 km/h. Raindrops fall vertically with a speed of 6 km/h. Find the velocity of raindrops with respect to the men.

Choices

Choice (4) Response

a.

4 km/hr

b.

3 km/hr

c.

10 km/hr

d.

7 km/hr

Question number: 270

» Electrostatics » Capacitors

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MCQ▾

Question

A parallel plate capacitor is charged to a potential. difference of 50V. It is discharged through a resistance. After 1 second, the potential difference between plates becomes 40V. Then

Choices

Choice (4) Response

a.

Potential difference between the plates after 2 seconds will be 20 V

b.

Fraction of stored energy after 1 second is 4/5

c.

Potential difference between the plates after 2 seconds will be 30V

d.

Fraction of stored energy after 1 second is 16/25

Question number: 271

» Electrostatics » Coulomb's Law

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MCQ▾

Question

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. Calculate the Coulomb force F between proton and electron. (here

Choices

Choice (4) Response

a.

b.

c.

d.

All of the above

Question number: 272

» Rotational Motion » Torque

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Assertion-Reason▾

Question

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 false but Ꭱ is true

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false