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206. By opening the door of a refrigerator which is inside the room,
A. you can cool the room to a certain degree.
B. you can cool it to the temperature inside the refrigerator.
C. you can warm the room.
D. None of these
Explanation:
207. What is the correct sequence in order of chronology ? A. Mendels law of inheritance B. Darwins theory of evolution C. Blood circulation by Harvey D. De Vries theory of mutation
A. A, B, C, D
B. B, D, A, C
C. C, B, A, D
D. D, B, C, A
Explanation:
208. Which of the following states Boyles law correctly ?
A. Temperature remaining constant, the volume of a given mass of any gas is directly proportional to pressure.
B. Temperature remaining constant, the volume of a given mass of any gas is inversely proportional to its pressure.
C. Volume and temperature remaining constant, the mass of any gas is inversely proportional to its pressure.
D. The volume of a given mass of any gas is directly proportional to the product ot its temperature and pressure.
Explanation:
209. English scientist, Rayleigh received the Noble Prize for the discovery of
A. Nitrogen
B. Argon
C. Mercury
D. Gold
Explanation:
210. Springs of shock absorbers of automobiles and railway coaches are made of steel and not of rubber because steel is
A. less elastic than rubber
B. more durable than rubber
C. less expensive than rubber
D. more elastic than rubber
Explanation:
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