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Engineering Physics Practice Test: Thermodynamics, Latent Heat, Specific Heat & Thermodynamics
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Thermodynamics is a branch of physics that studies the relationship between heat, work, and temperature, and how they relate to energy, entropy, and the physical properties of matter and radiation.  Specific heat is the amount of heat needed to raise the temperature of 1 gram of a substance by 1 degree Celsius. It is also known as massic heat capacity.  The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree.  Specific heat is a property of the substance. Its SI... Show more
Engineering Physics Practice Test: Thermodynamics, Latent Heat, Specific Heat & Thermodynamics
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25 Questions

1. The door of a domestic refrigerator is kept open while the switch is on. Then the room will ___________
2. 80g of water at 30°C is poured on a large block of ice which is at 0°C. The mass of ice that melts is ___________
3. Heat capacity of a substance is infinite. It means ___________
4. The thermal capacity of 40g of aluminium (specific heat = 0.2 cal°g-1 C-1) is ___________
5. Assertion: In a pressure cooker the water is about to be boiled. The cooker is then removed from the stove. Now on removing the lid of the pressure cooker, the water boils again.
Reason: The impurities in water bring down its boiling point.
6. If the amount of heat given to a system is 35 J and the amount of work done by the system is -15J and the amount of work done by the system is -15J, then the change in the internal energy of the system is?
7. It is possible that the temperature of the body changes even without giving heat to it or taking heat from it.
8. A system, after passing through different states returns back to its original state, is called ___________
9. The molar specific heat constant pressure of an ideal gas is 7R/2. The ratio of specific heat at constant pressure to that at constant volume is?
10. Assertion: Water kept in an open vessel will quickly evaporate on the surface of the moon.
Reason: The temperature at the surface of the moon is much higher than the boiling point of water.
11. Assertion: When a glass of hot milk placed in a room is allowed to cool, its entropy decreases.
Reason: Allowing the hot object to cool does not violate the second law of thermodynamics.
12. Which is an intensive property?
13. The change internal energy in a cyclic process is ___________
14. The Wien’s displacement law expresses a relation between ___________
15. The inside and outside temperature of a refrigerator are 273K and 303K respectively. Assuming that refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be?
16. According to Newton’s law of cooling, the rate at which a body cools is proportional to (∆θ)n, where ∆θ is the difference if the temperature of the body and the surroundings. What is n equal to?
17. The mechanical energy can be completely converted into heat energy but the whole of the heat energy cannot be converted into mechanical energy.
18. Assertion: Reversible systems are difficult to find in the real world.
Reason: Most process is dissipative in nature.
19. The change in internal energy, when a gas is cooled from 927° to 27° is?
20. A constant volume gas thermometer using helium records a pressure of 20.0kPa at the triple point of water and pressure of 14.3 kPa at the temperature of ‘dry ice’. What is the temperature of dry ice?
21. In a thermal process, the pressure of a fixed mass of a gas is changed in such a manner that the gas molecules give out the heat of 30J and work of 10J is done on the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be?
22. Calculate the work done if temperature is changes from 0°C to 200°C at one atmosphere.
23. 50g of ice at 0°C is mixed with 50g of water at 80°C, what will be the final temperature of a mixture?
24. If boiling point of water is 95°F, what will be reading at Celsius scale?
25. Heat was given to a body, which raises its temperature by 1°C is ___________