AIIMS Physics: Questions 251  256 of 500
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Question number: 251
» Kinematics » Relative Velocity
Question
A bike can be stopped by brakes after at least 10 m, when it moving with a speed of . If the same bike is moving with , the minimum stopping distance is –
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 252
» Rotational Motion » Concepts of Rotational Motion
Question
If the equation for the displacement of a particle moving on a circular path is given by , where is in radians and t in seconds, then the angular velocity of the particle after 3 s from its start is –
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 253
» Magnetic Effects of Current and Magnetism » Para, Dia and FerroMagnetic Substances
Question
Magnetic permeability is minimum for –
Choices
Choice (4)  Response  

a.  Diamagnetic substance  
b.  Ferromagnetic substance  
c.  Paramagnetic substance  
d.  None of the above 
Question number: 254
» Magnetic Effects of Current and Magnetism » Bar Magnet
Question
Force between two identical bar magnets whose centers are meter apart is 5.4 N when their axes are in same line. If separation is increased to , the force between them is reduced to:
Choices
Choice (4)  Response  

a.  0.3 N  
b.  2.4 N  
c.  1.2 N  
d.  0.6 N 
Question number: 255
» Atoms and Nuclei » Radioactive Decay Law
Question
A radioactive material has a half – life of 8 days. What fraction of the material would remain after 48 days –
Choices
Choice (4)  Response  

a.  0.156  
b.  0.0625  
c.  0.625  
d.  0.0156 
Question number: 256
» Laws of Motion » Centripetal Force
Question
A body of mass 7 kg is moving in a circle of diameter 2 m with an angular velocity of . The centripetal force is –
Choices
Choice (4)  Response  

a.  350 N  
b.  75 N  
c.  175 N  
d.  100 N 