KVPY StreamSA (Class 11) Physics: Questions 164  169 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 

Question number: 169
» Kinematics » Relative Velocity
Question
A boat crossing a river moves with a velocity v relative to still water. The river is flowing with a velocity with respect to the bank. The angle with respect to the flow direction with which the boat should move to minimize the drift is–
Choices
Choice (4)  Response  

a.  135^{0} 

b.  60^{0} 

c.  30^{0} 

d.  120^{0} 
