Physics General

Q: The ratio of output work per cycle to input energy per cycle is called :

(a) :  Pressure
(b) :  Efficiency
(c) :  Internal energy
(d) :  Entropy
(e) :  None of the Above
Answer:  Efficiency
Explanation:  

Q: Change in momentum per second is :

(a) :  Ratio of area and pressure
(b) :  Ratio of pressure and area
(c) :  Product of pressure and area
(d) :  Product of force and time
(e) :  None of the Above
Answer:  Product of pressure and area
Explanation:  

Q: Which of the following does not have the same units?

(a) :  Power
(b) :  Kinetic energy
(c) :  Work
(d) :  Heat
(e) :  None of the Above
Answer:  Power
Explanation:  

Q: A ray of light passing from a denser to a rarer medium:

(a) :  Suffers no change in direction
(b) :  Bends towards normal
(c) :  Reflects all around
(d) :  Away from normal
(e) :  None of the Above
Answer:  Away from normal
Explanation:  

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