If sink is at a temperature of -39⁰C and source at 0⁰C, then efficiency will be
Options
(a) 14.20% (b) 20.20% (c) 35.20% (d) 45.50%
Correct Answer:
14.20%
Explanation:
No explanation available. Be […]
If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system, then the increase in the internal energy ∆U is
Options
(a) ∆W+∆Q (b) ∆W-∆Q (c) ∆Q-∆W (d) […]
Which is incorrect about thermal process
Options
(a) In an isobaric process ΔP=0 (b) In an isochoric process ΔW=0 (c) In an isothermal process ΔT=0 (d) In an isothermal process ΔQ=0
Correct Answer: […]
A tyre filled with air (27° C and 2 atm) bursts. The temperature of air is (ˠ=1.5)
Options
(a) -33° C (b) 0° C (c) 27° C (d) 240° C
Correct Answer:
-33° […]
When there is no heat change from surroundings in a system, then the process taking place is
Options
(a) isobaric (b) isochoric (c) adiabatic (d) isothermal
Correct Answer:
adiabatic
Explanation:
No explanation available. […]
Heat is supplied at constant pressure to diatomic gas. The part of this heat that goes to increase its internal energy will be
Options
(a) 5 / 7 (b) 3 / 5 (c) […]
A carnot’s engine operates with source at 127° C and sink at 27° C. If the source supplies 40 kJ of heat energy, the work done by the engine is
Options
(a) 30 […]
In a water fall, the water falls from a height of 100 m. If the entire kinetic energy of water is converted into heat, the rise in temperature of water will be
Options
A lead bullet of 10 gm travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is(sp.heat […]
A calorimeter contains 0.2 kg of water at 30° C. 0.1kg of water at 60° C is added to it. The mixture is well stirred and the resulting temperature is found to be 35° C. […]
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