NEST (National Entrance Screening Test) Physics: Questions 25  27 of 58
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Question number: 25
» Physics and Measurement » Dimensions of Physical Quantities
Appeared in Year: 2009
Question
A physical quantity is expected to behave, according to theory, as , where are unknown positive constants. Measurements are made for for a number of values of , including . The best way to proceed to verify the relation and to determine and is –
Choices
Choice (4)  Response  

a.  To plot vs . Slope will give . 

b.  To find for each measurement. Plot vs and fit it to a straight line. Slope of the line will give and intercept will give . 

c.  To plot vs for various values of till we get a straight line graph. Then the slope of the line gives . 

d.  To plot vs . Employ the relation for some . Take the average value of . 

Question number: 26
» Thermodynamics » Carnot Engine and Its Efficiency
Appeared in Year: 2013
Question
An engine absorbs heat at a temperature of and exhausts heat at a temperature of . The engine operates at the maximum possible efficiency. The amount of work the engine performs for of heat input can be –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 27
» Electromagnetic Induction & Alternating Currents » Electromagnetic Induction
Appeared in Year: 2013
Question
An airplane of wingspan is traveling at in a region where the earth’s magnetic field is . The maximum voltage that can possibly be developed between the ends of the wing is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

