KVPY StreamSA (Class 11) Physics: Questions 164  168 of 252
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Question number: 164
» Kinematics » Relative Velocity
Question
A train of length l (165 m) is going towards north directional constant speed v_{1}=12 m/s. A parrot flies at a constant speed of v_{2} = 3 m/s towards south parallel to be railway track. The time taken by the parrot to cross the train is –
Choices
Choice (4)  Response  

a.  15 s 

b.  18 s 

c.  11 s 

d.  9 s 

Question number: 165
» Kinetic Theory of Gases » Equation of State of a Perfect Gas
Question
If for a gas, The atomicity of the gas is
Choices
Choice (4)  Response  

a.  Triatomic 

b.  Diatomic 

c.  Cannot determine 

d.  Monoatomic 

Question number: 166
» Atoms and Nuclei » Radioactivity
Question
The activity of a radioactive sample reduces to of its original value in 9 hours. What will be its activity in 27 hours?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 167
» Kinematics » Projectile Motion
Question
The maximum height attained by a projectile is increased by 15 % by increasing its speed of projection, without changing the angle of projection. The percentage increase in the horizontal range will be –
Choices
Choice (4)  Response  

a.  20 % 

b.  10% 

c.  15% 

d.  5% 

Question number: 168
» Work, Energy and Power » WorkEnergy Theorem
Question
The displacement x of a particle moving in one dimension, under the action of a constant force is related to time t by the equation:
Where, x is in meter and t is sec. The work done by the force in first 4 sec is –
Choices
Choice (4)  Response  

a.  6 J 

b.  4 J 

c.  8 J 

d.  0 
