NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 121  125 of 2184
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Question number: 121
» Kinematics » Motion in a Straight Line
Question
A particle moves towards east with velocity 5 m/s. After 10 seconds its direction changes towards north with same velocity. The average acceleration of the particle is
Choices
Choice (4)  Response  

a.  m/s ^{2} SW 

b.  zero 

c.  m/s ^{2} NW 

d.  m/s ^{2} NE 

Question number: 122
» Kinematics » Motion in a Straight Line
Question
A 120 m long train is moving towards west with a speed of 10 m/s. A bird flying towards east with a speed of 5 m/s crosses the train. The time taken by the bird to cross the train will be
Choices
Choice (4)  Response  

a.  8 sec 

b.  16 sec 

c.  14 sec 

d.  12 sec 

Question number: 123
» Kinematics » Motion in a Straight Line
Question
P, Q and R are three coplanar forces acting at a point and are in equilibrium. Given P = 1.9318 kg wt, sin Q = 0.9659, the value of R is (in kg wt)
Choices
Choice (4)  Response  

a.  1 

b.  0.9659 

c.  2 

d.  0.5 

Question number: 124
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
Assertion (Ꭺ)
The sum of two vectors can be zero.
Reason (Ꭱ)
Two vectors cancel each other, when they are equal and opposite.
Choices
Choice (4)  Response  

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

b.  Both Ꭺ and Ꭱ are false 

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

d.  Ꭺ is true but Ꭱ is false 

Question number: 125
» Kinematics » Scalars and Vectors » Scalar and Vector Products
Question
What is the value of linear velocity, if co = 3i 4j + k and r = 5i  6j + 6k
Choices
Choice (4)  Response  

a.  6  2 + 3 

b.  6  2 + 8 

c.  18  13 + 2 

d.  4  13 + 6 
