Kinematics (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 74  77 of 233
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Question number: 74
» Kinematics » Scalars and Vectors » Scalar and Vector Products
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.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

Question number: 75
» 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: 76
» 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 and 3 are correct 

b.  1, 2 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 2 are correct 

Question number: 77
» Kinematics » Motion in a Straight Line
Question
A metal sphere is hung by a string fixed to a wall. The sphere is pushed away from the wall by a stick. The forces acting on the sphere are shown in the second diagram. Which of the following statements is wrong?
In above fig we shows that metal sphere fixed at the wall, as we apply some force on it then motion is taking place, here angle is .
Choices
Choice (4)  Response  

a.  + + = 0 

b.  T ^{2} + P ^{2} + W ^{2} = 0 

c.  T^{2} = P^{2} + W^{2 } 

d.  p = w 
