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1. Question4 points
A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is [Take 1 cal = 4.2 joules) [NEET 2016]Correct
2. Question4 points
A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is
[Latent heat of ice is 3.4 × 105 J/kg and g = 10 N/kg] [NEET 2016]Correct
3. Question4 points
An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas? [AIPMT 2015]Correct
4. Question4 points
Helium gas goes through a cycle ABCDA (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of this cycle is nearly : (Assume the gas to be close to ideal gas) [AIEEE 2012]Correct
5. Question4 points
“Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of [AIEEE 2003]Correct