225. Hydrogen is the __________ substance.
A.Lightest
B.Heaviest
C.
D.

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226. Otto cycle is also known as
A.Constant pressure cycle
B.Constant volume cycle
C.Constant temperature cycle
D.Constant temperature and pressure cycle

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227. For a perfect gas, according to Boyle's law (where P = Absolute pressure, V = Volume, and T = Absolute temperature)
A.PV = constant, if T is kept constant
B.V/T = constant, if P is kept constant
C.P/T = constant, if V is kept constant
D.T/P = Constant, if V is kept constant

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228. The efficiency of a dual combustion cycle __________ upon cut-off ratio.
A.Depends
B.Does not depend
C.
D.

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229. The efficiency of Diesel cycle depends upon
A.Temperature limits
B.Pressure ratio
C.Compression ratio
D.Cut-off ratio and compression ratio

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230. Those substances which have so far not been resolved by any means into other substances of simpler form are called
A.Elements
B.Compounds
C.Atoms
D.Molecules

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231. The measurement of a thermodynamic property known as temperature is based on
A.Zeroth law of thermodynmics
B.First law of thermodynamics
C.Second law of thermodynamics
D.None of these

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