KVPY StreamSA (Class 11) Physics: Questions 134  137 of 252
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Question number: 134
» Work, Energy and Power » Power
Question
A 250 W motor drivers a pump which lifts 90 liters of water per minute to a height of 4 meters. The efficiency of the motor is nearly (take acceleration due to gravity to be 10 m/s^{2})
Choices
Choice (4)  Response  

a.  28 % 

b.  26 % 

c.  24 % 

d.  22 % 

Question number: 135
» Current Electricity » Ohm's Law
Appeared in Year: 2015
Question
A light bulb of resistance R = 16 Ω is attached in series with an infinite resistor network with identical resistances r as shown below. A 10 V battery drives current in the circuit. What should be
the value of r such that the bulb dissipates about 1 W of power?
Choices
Choice (4)  Response  

a.  29.4 Ω 

b.  3.7 Ω 

c.  14.8 Ω 

d.  7.4 Ω 

Question number: 136
» Properties of Solids & Liquids » Latent Heat
Question
An ice ball falls from a height h and melts completely. Assuming that only onefifth of the heat generated is absorbed by the ice, calculate the value of h.
(Latent heat of fusion of ice = 3.4⨯10^{5} JKg^{1} and g = 10 Nkg^{1})
Choices
Choice (4)  Response  

a.  160 

b.  165 

c.  170 

d.  155 

Question number: 137
» Thermodynamics » Concept of Temperature
Appeared in Year: 2015
Question
One mole of ideal gas undergoes a linear process as shown in figure below. Its temperature expressed as function of volume V is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

