112. A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is
(a) justified
(b) not possible
(c) may be possible with lot of sophistica-tions
(d) cost will be very high
(e) theroretically possible.
Ans: b
113. In a Carnot cycle, heat is transferred at
(a) constant pressure
(b) constant volume
(c) constant temperature
(d) constant enthalpy
(e) any one of the above.
Ans: c
114. A diathermy wall is one which
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages thermal interaction
(d) discourages thermal interaction
(e) does not exist.
Ans: b
115. An adiabatic wall is one which
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages thermal interaction
(d) discourages thermal interaction
(e) dos not exist.
Ans: a
116. The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
(a) The room will be cooled to the temperature inside the refrigerator.
(b) The room will be cooled very slightly.
(c) The room will be gradually warmed up.
(d) The temperature of the air in room will remain unaffected.
(e) any one of above is possible depending on the capacity.
Ans: c
117. Compressed air coming out from a punctured football
(a) becomes hotter
(b) becomes cooler1
(c) remains at the same temperature
(d) may become hotter or cooler depending upon the humidity of the surround¬ing air
(e) attains atmospheric temperature.
Ans: b
118. Water contained in a beaker can be made to boil by passing steam through it
(a) at atmospheric pressure
(b) at a pressure below the tropospheric pressure
(c) at a pressure greater than atmospheric pressure
(d) any pressure
(e) not possible.
Ans: c
119. During throttling process
(a) heat exchange does not take place
(b) no work is done by expanding steam
(c) there is no change of internal energy of steam
(d) all of the above
(e) entropy decreases.
Ans: d
120. The energy of molecular motion appears as
(a) heat
(b) potential energy
(c) surface tension
(d) friction
(e) increase in pressure.
Ans: a
121. A sudden fall in the barometer reading is a
sign of approaching
(a) fine weather
(b) rains
(c) storm
(d) cold wave
(e) hot wave.
Ans: c
122. The unit of universal gas constant is
(a) watts/°K
(b) dynes/°C
(c) ergscm/°K
(d) erg/°K
(e) none of the above.
Ans: d
123. Calorie is a measure of
(a) specific heat
(b) quantity of heat
(c) thermal capacity
(d)entropy
(e) work.
Ans: b
124. I kgf/cm2 is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) lOOmmHg.
Ans: c
125. Barometric pressure is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) 100mm Hg.
Ans: a
126. One barometric pressure or 1 atmospheric pressure is equal to
(a) 1 kgf/cnr2
(b) 1.033 kgf/cm2
(c) 0 kgf/cm2
(d) 1.0197 kgf/cm2
(e) 100 kgf/cm2.
Ans: b
127. The first law of thermodynamics is the law of
(a) conservation of mass
(b) conservation of energy
(c) conservation of momentum
(d) conservation of heat
(e) conservation of temperature.
Ans: b
128. A perpetual motion machine is
(a) a thermodynamic machine
(b) a non-thermodynamic machine
(c) a hypothetical machine
(d) a hypothetical machine whose operation would violate the laws of thermodynamics
(e) an inefficient machine.
Ans: d
129. Kelvin Planck's law deals with
(a) conservation of heat
(b) conservation of work
(c) conversion of heat into work
(d) conversion of work into heat
(e) conservation of mass.
Ans: c
130. According to Clausius statement of second law of thermodynamics
(a) heat can't be transferred from low temperature source to high tempera¬ture source
(b) heat can be transferred for low temperature to high temperature source by using refrigeration cycle.
(c) heat can be transferred from low temperature to high temperature source if COP of process is more than unity
(d) heat can't be transferred from low temperature to high temperature source without the aid of external energy
(e) all of the above.
Ans: d
(a) justified
(b) not possible
(c) may be possible with lot of sophistica-tions
(d) cost will be very high
(e) theroretically possible.
Ans: b
113. In a Carnot cycle, heat is transferred at
(a) constant pressure
(b) constant volume
(c) constant temperature
(d) constant enthalpy
(e) any one of the above.
Ans: c
114. A diathermy wall is one which
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages thermal interaction
(d) discourages thermal interaction
(e) does not exist.
Ans: b
115. An adiabatic wall is one which
(a) prevents thermal interaction
(b) permits thermal interaction
(c) encourages thermal interaction
(d) discourages thermal interaction
(e) dos not exist.
Ans: a
116. The door of a running refrigerator inside a room was left open. Which of the following statements is correct?
(a) The room will be cooled to the temperature inside the refrigerator.
(b) The room will be cooled very slightly.
(c) The room will be gradually warmed up.
(d) The temperature of the air in room will remain unaffected.
(e) any one of above is possible depending on the capacity.
Ans: c
117. Compressed air coming out from a punctured football
(a) becomes hotter
(b) becomes cooler1
(c) remains at the same temperature
(d) may become hotter or cooler depending upon the humidity of the surround¬ing air
(e) attains atmospheric temperature.
Ans: b
118. Water contained in a beaker can be made to boil by passing steam through it
(a) at atmospheric pressure
(b) at a pressure below the tropospheric pressure
(c) at a pressure greater than atmospheric pressure
(d) any pressure
(e) not possible.
Ans: c
119. During throttling process
(a) heat exchange does not take place
(b) no work is done by expanding steam
(c) there is no change of internal energy of steam
(d) all of the above
(e) entropy decreases.
Ans: d
120. The energy of molecular motion appears as
(a) heat
(b) potential energy
(c) surface tension
(d) friction
(e) increase in pressure.
Ans: a
121. A sudden fall in the barometer reading is a
sign of approaching
(a) fine weather
(b) rains
(c) storm
(d) cold wave
(e) hot wave.
Ans: c
122. The unit of universal gas constant is
(a) watts/°K
(b) dynes/°C
(c) ergscm/°K
(d) erg/°K
(e) none of the above.
Ans: d
123. Calorie is a measure of
(a) specific heat
(b) quantity of heat
(c) thermal capacity
(d)entropy
(e) work.
Ans: b
124. I kgf/cm2 is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) lOOmmHg.
Ans: c
125. Barometric pressure is equal to
(a) 760 mm Hg
(b) zero mm Hg
(c) 735.6 mm Hg
(d) 1 mm Hg
(e) 100mm Hg.
Ans: a
126. One barometric pressure or 1 atmospheric pressure is equal to
(a) 1 kgf/cnr2
(b) 1.033 kgf/cm2
(c) 0 kgf/cm2
(d) 1.0197 kgf/cm2
(e) 100 kgf/cm2.
Ans: b
127. The first law of thermodynamics is the law of
(a) conservation of mass
(b) conservation of energy
(c) conservation of momentum
(d) conservation of heat
(e) conservation of temperature.
Ans: b
128. A perpetual motion machine is
(a) a thermodynamic machine
(b) a non-thermodynamic machine
(c) a hypothetical machine
(d) a hypothetical machine whose operation would violate the laws of thermodynamics
(e) an inefficient machine.
Ans: d
129. Kelvin Planck's law deals with
(a) conservation of heat
(b) conservation of work
(c) conversion of heat into work
(d) conversion of work into heat
(e) conservation of mass.
Ans: c
130. According to Clausius statement of second law of thermodynamics
(a) heat can't be transferred from low temperature source to high tempera¬ture source
(b) heat can be transferred for low temperature to high temperature source by using refrigeration cycle.
(c) heat can be transferred from low temperature to high temperature source if COP of process is more than unity
(d) heat can't be transferred from low temperature to high temperature source without the aid of external energy
(e) all of the above.
Ans: d
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