NEET Physics: Questions 69  72 of 2098
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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 

Question number: 71
» Physics and Measurement » Dimensions of Physical Quantities
Question
The frequency of vibration of string is given by v = [Fm] ^{1/2} Here P is number of segments in the string and l is the length. The dimensional formula for m will be
Choices
Choice (4)  Response  

a.  [M L ^{0 } T ^{1}] 

b.  [M L ^{1} T ^{0}] 

c.  [M ^{0} L T ^{1}] 

d.  [M ^{0 } L ^{0} T ^{0}] 

Question number: 72
» Kinematics » Average Speed and Instantaneous Velocity
Question
the distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separations increase at the rate of 4 m/s. The particles have speeds as
Choices
Choice (4)  Response  

a.  4 m/sec; 1 m/sec 

b.  5 m/sec; 1 m/sec 

c.  4 m/sec; 2 m/sec 

d.  5 m/sec; 2 m/sec 
