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
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
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
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
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 
