NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 68  70 of 2142
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Question number: 68
» Physics and Measurement » Errors in Measurement
Question
A physical quantity A is related to four observable a, b, c and d as follows, A =
the percentage errors of measurement in a, b, c and d are 1%, 3%, 2 % and 2 % respectively. What is the percentage error in the quantity A?
Choices
Choice (4)  Response  

a.  14% 

b.  7% 

c.  5% 

d.  12% 

Question number: 69
» Kinematics » Motion in a Straight Line
Question
A plane is to fly due north. The speed of the plane relative to the air is 200 km/h, and the wind is blowing from west to east at 90 km/h.
(1) The plane should head in a direction of sin1 (0.45)
(2) The plane should head in a direction of sin1 (0.60)
(3) The relative velocity of plane w. r. t. ground is 179 km/h
(4) The relative velocity of plane w. r. t. ground is 149 km/h
Choices
Choice (4)  Response  

a.  1 and 2 

b.  1, 2 and 3 

c.  2 and 4 

d.  1 and 3 

Question number: 70
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The magnitude of velocity of two boats relative to river is same. Both boats start simultaneously from same point on the bank may reach opposite bank simultaneously moving along different paths.
Reason (Ꭱ)
For boats to cross the river in same time. The component of their velocity relative to river in direction normal to flow should be same.
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 false 

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