NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 153  158 of 2142
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Question number: 153
» Kinematics » Average Speed and Instantaneous Velocity
Question
A body of mass 4 kg lying on a smooth surface is attached to a string 6 m long and then whirled round in a horizontal circle making 60 revolution per minute. The centripetal acceleration will be
Choices
Choice (4)  Response  

a.  23.68 m/s ^{2} 

b.  236.6 m/s ^{2} 

c.  1.18 m/s ^{2} 

d.  2.368 m/s ^{2} 

Question number: 154
» Kinematics » Average Speed and Instantaneous Velocity
Question
The length of second’s hand in a watch is 1 cm. The change in velocity of its tip in 15 second is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d.  0 

Question number: 155
» Kinematics » Motion in a Plane
Question
Rishabh and Bappy are playing with two different balls of masses m and 2m respectively. If Rishabh throws his ball vertically up and Bappy at an angle 0, both of them stay in our view for the same period. The heights attained by the two balls are in the ratio of
Choices
Choice (4)  Response  

a.  1: 1 

b.  2: 1 

c.  1: sec 0 

d.  1: cos 9 

Question number: 156
» Kinematics » Motion in a Plane
Question
A body is thrown at an angle 30° to the horizontal with the velocity of 30 m/s. After 1 sec, its velocity will be (in m/s) (g = 10 m/s2)
Choices
Choice (4)  Response  

a.  10√7 

b.  √10 

c.  100√7 

d.  700√10 

Question number: 157
» Kinematics » Uniformly Accelerated Motion
Question
Using rectangular coordinates and the unit vectors i and j, the vector expression for the acceleration a will be (r is a position vector) 
Choices
Choice (4)  Response  

a.  2r ^{2 } 

b.   ^{2} r 

c. 


d.  r ^{2} 

Question number: 158
» Kinematics » Average Speed and Instantaneous Velocity
Question
A ball is thrown from the top of a tower with an initial velocity of 10 m/s at an angle of 30° above the horizontal. It hits the ground at a distance of 17.3 m from the base of the tower. The height of the tower (g = 10 m/s2) will be
Choices
Choice (4)  Response  

a.  10m 

b.  110m 

c.  100m 

d.  12m 
