NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 59  63 of 2142
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Question number: 59
» Physics and Measurement » SI Units
Question
SI unit of permittivity is
Choices
Choice (4)  Response  

a.  C ^{1} m ^{2} N ^{2} 

b.  C ^{2} m ^{2} N ^{2} 

c.  C ^{2} m ^{2} N ^{2} 

d.  C ^{2} m ^{2} N ^{1} 

Question number: 60
» Kinematics » Motion in a Straight Line
Question
A stone is dropped from a miner of height h and it reaches after t seconds on earth. From the same miner if two stones are thrown (one upwards and other downwards) with the same velocity u and they reach the earth surface after t _{1} and t _{2} seconds respectively, then
Choices
Choice (4)  Response  

a.  t = 

b.  t = 

c.  t = 

d.  t = t _{1}  t _{2 } 

Question number: 61
» Kinematics » Motion in a Straight Line
Assertion (Ꭺ)
Displacement of a body may be zero when distance travelled by it is not zero.
Reason (Ꭱ)
The displacement is the longest distance between initial and final position.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Ꭺ is false but Ꭱ is true 

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

d.  Both Ꭺ and Ꭱ are false 

Question number: 62
» Kinematics » Frame of Reference
Question
if a particle travels a linear distance at speed v _{1} and comes back along the same track at speed v _{2}.
(1) Its average speed is arithmetic mean (v _{1} + v _{2}) / 2
(2) Its average speed is harmonic mean 2 v _{1} v _{2 } / (v _{1} + v _{2}) /2
(3) Its average speed is geometric mean √v _{1} v _{2}
(4) Its average velocity is zero
Choices
Choice (4)  Response  

a.  2 and 4 

b.  1 and 3 

c.  1,2 and 3 

d.  1 and 2 

Question number: 63
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.
Reason (Ꭱ)
A body of all mass group travels under constant acceleration when only gravity acts on it.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Ꭺ is true but Ꭱ is false 

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

d.  Both Ꭺ and Ꭱ are false 
