KVPY (Kishore Vaigyanik Protsahan Yojana) StreamSA (Class 11) Physics: Questions 144  147 of 253
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Question number: 144
» Laws of Motion » Static and Kinetic Friction
Question
A block, resting on the top of a plane inclined at 45^{0} with the horizontal, slides down with an acceleration of . Calculate the coefficient of kinetic friction.
Choices
Choice (4)  Response  

a. 


b.  2 

c. 


d. 


Question number: 145
» Properties of Solids & Liquids » Specific Heat Capacity
Question
A 15.0 W electrical heater is used to heat a container filled with 0.5 kg of water. It is found that the temperature of the water and the container rise by 4 K in 20 minutes. The container is then emptied, dried, and filled with 3 kg of oil. It is now observed that the same heater raises the temperature of the containeroil system by 3 K in 25 minutes. Assuming no other heat losses in any of the processes, the specific heat capacity of the oil is,
Choices
Choice (4)  Response  

a.  1700 JK^{1} kg^{1} 

b.  1800 JK^{1} kg^{1} 

c.  1900 JK^{1} kg^{1} 

d.  1500 JK^{1} kg^{1} 

Question number: 146
» Ray Optics » Lens Maker's Formula and Lens Formula
Question
A point source of light is moving at a rate of 2 cms^{–1} towards a thin convex lens of focal length 10 cm along its optical axis. When the source is 15 cm away from the lens the image is moving at
Choices
Choice (4)  Response  

a.  8 cms^{–1} away from the lens 

b.  4 cms^{–1} away from the lens 

c.  4 cms^{–1} towards the lens 

d.  8 cms^{–1} towards the lens 

Question number: 147
» Thermodynamics » Concept of Temperature
Question
An open mouthed bottle contains a gas at 50^{0} C. To what temperature should the gas be heated so that half mass of the gas may leave it?
Choices
Choice (4)  Response  

a.  373^{0} C 

b.  380^{0} C 

c.  444^{0} C 

d.  350^{0} C 
