NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 131  134 of 2184
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Question number: 131
» Kinematics » Motion in a Straight Line
Question
A man can swim with velocity v relative to water. He has to cross a river of width d flowing with a velocity u (w > v). The distance through which he is carried downstream by the river is x. Which of the following statements is correct?
Choices
Choice (4)  Response  

a.  x cannot be less than du/v 

b.  If he crosses the river in minimum time x = du/v 

c.  x will be maximum if he swims in a direction making an angle of π/2 + sin1  1 (v/u) with direction of the flow of water. 

d.  Force to be minimum he has to swim in a direction making an angle of π/2 sin 1 (v/u) with the direction of the flow of water. 

Question number: 132
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
Assertion (Ꭺ)
IfA + B= AB, then angle between A and B is 90°
Reason (Ꭱ)
A + B = B + A
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Ꭺ is false but Ꭱ is true 

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

d.  Ꭺ is true but Ꭱ is false 

Question number: 133
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
The three vectors A = 3i  2j  k, B = i  3j + 5k and C = 2i  j  4k does not form
(1) an equilateral triangle
(2) isosceles triangle
(3) a right angled triangle
(4) no triangle
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  2 and 4 are correct 

c.  1,2 and 3 are correct 

d.  1 and 3 are correct 

Question number: 134
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
A boy walks uniformly along the sides of a rectangular park of size 400 m x 300 m, starting from one corner to the other corner diagonally opposite. Which of the following statements is correct?
(1) He has travelled a distance of 700 m
(2) His displacement is 500 m
(3) His velocity is not uniform throughout the walk
(4) His displacement is 700 m
Choices
Choice (4)  Response  

a.  1,2 and 3 are correct 

b.  2 and 4 are correct 

c.  1 and 2 are correct 

d.  1 and 3 are correct 
