KVPY (Kishore Vaigyanik Protsahan Yojana) StreamSA (Class 11) Physics: Questions 132  135 of 253
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Question number: 132
» Laws of Motion » Force and Inertia
Appeared in Year: 2015
Question
A parachutist with total weight 75 kg drops vertically onto a sandy ground with a speed of 2 ms^{–1} and comes to a halt over a distance of 0.25 m. The average force from the ground on her is close to
Choices
Choice (4)  Response  

a.  1200 N 

b.  1350 N 

c.  600 N 

d.  1950 N 

Question number: 133
» Gravitation » Energy
Appeared in Year: 2015
Question
A planet is orbiting the sun is an elliptical orbit. Let U denote the potential energy and K denote the kinetic energy of the planet at an arbitrary point on the orbit. Choose the correct statement
Choices
Choice (4)  Response  

a.  for two positions of the planet in the orbit 

b.  always 

c.  always 

d.  always 

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 
