Kinematics (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 160  164 of 233
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Passage
Read the passage given below and answer the questions that follows:
Three of the fundamental constants of physics are the universal gravitational constant, G = 6.7 x 10 WkgV2, the speed of light, c  3.0 x 108 m/s, and Planck’s constant, ft = 6.6x 10  34 Js1. Two particles A and B are projected in the vertical plane with same initial velocity u0 from part (0, 0) and (, h) towards each other as shown in figure at t = 0.
Question number: 160 (3 of 3 Based on Passage) Show Passage
» Kinematics » Average Speed and Instantaneous Velocity
Question
The time when separation between A and B is minimum is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 161
» Kinematics » Average Speed and Instantaneous Velocity
Question
A boy standing on a weighing machine observes his weight as 200 N. When he suddenly jumps upwards, his friend notices that the reading increased to 400 N. The acceleration by which the boy jumped will be
Choices
Choice (4)  Response  

a.  9.8 m/s ^{2} 

b.  29.4 m/s ^{2} 

c.  4.9 m/s ^{2} 

d.  14.7 m/s ^{2} 

Question number: 162
» Kinematics » Motion in a Plane
Question
A man whirls a stone round his head on the end of a string 4.0 metre long. Can the string be in a horizontal, plane? If the stone has a mass of 0.4 kg and the string will break, if the tension in it exceeds 8 N. The smallest angle the string can make with the horizontal and the speed of the stone will respectively be (Take g = 10 m/sec ^{2})
Choices
Choice (4)  Response  

a.  45°, 8.2 m/s 

b.  60°, 7.7 m/s 

c.  60°, 8.7 m/s 

d.  30°, 7.7 m/s 

Question number: 163
» Kinematics » Average Speed and Instantaneous Velocity
Question
A disc of mass 5 gm is kept horizontally in air by firing bullets of mass 10 g each at the rate of 20/s. If the bullets rebound with same speed. The velocity with which the bullets are fired is –
Choices
Choice (4)  Response  

a.  9.28 cm/s 

b.  1.25 cm/s 

c.  1.96 cm/s 

d.  4.89 cm/s 

Question number: 164
» Kinematics » Average Speed and Instantaneous Velocity
Question
A swimmer who can swim in a river with speed mv (with respect to still water) where v is the velocity of river current, jumps into the river from one bank to cross the river. Then
Select the correct answers and mark it according to the following codes:
(1) If m < 1 he cannot cross the river
(2) If m < 1 he cannot reach a point on other bank directly opposite to his starting point.
(3) If m > 1 he can reach a point on other bank
(4) He can reach the other bank at some point, whatever be the value of m.
Choices
Choice (4)  Response  

a.  1 and 2 are correct 

b.  1, 2 and 3 are correct 

c.  2 and 4 are correct 

d.  1 and 3 are correct 
