This General Science quiz on Heat and Thermodynamics puts 11 multiple-choice questions to you, the verified MCQs published with GK24's note on the topic. Every question carries a full explanation of why the correct option is right and why the other options are wrong, so you learn the fact behind the answer rather than the letter. Attempt it right after reading the note, keep to the timer, and use the explanations at the end to mark what needs another look. Sit it again before the exam as a quick revision of the topic.
11 questions with answers and explanations
The SI unit of heat is the
Heat is a form of energy in transit, so it is measured in the same unit as work and energy, the joule, which is one newton metre.
Read the full explanation →Water has its maximum density at a temperature of
Water behaves abnormally between zero and four degrees: it contracts as it is heated in that range and expands again above four degrees, so the same mass occupies its least volume, and therefore has its greatest density, at four degrees Celsius.
Read the full explanation →The latent heat of vaporisation of water is about
This is the heat that one gram of water at a hundred degrees Celsius must absorb to become steam at the same temperature, with no rise in temperature at all; the same quantity is released when steam condenses back to water.
Read the full explanation →In a vacuum flask, the vacuum between the two walls prevents heat transfer mainly by
Both of these modes need matter: conduction passes energy from particle to particle and convection carries it by the movement of a fluid.
Read the full explanation →The first law of thermodynamics is essentially a statement of
The first law says that the heat supplied to a system is equal to the increase in its internal energy plus the external work it does.
Read the full explanation →Which law of thermodynamics provides the basis for the concept of temperature?
It states that if body A is in thermal equilibrium with body C, and body B is also in thermal equilibrium with body C, then A and B are in thermal equilibrium with each other.
Read the full explanation →Heat from the sun reaches the earth mainly by which mode of transfer?
The space between the sun and the earth is very nearly empty, and radiation is the only mode of heat transfer that needs no material medium: energy travels as electromagnetic waves at the speed of light and is absorbed when it strikes matter.
Read the full explanation →A Carnot engine works between a source at 500 kelvin and a sink at 300 kelvin. Its efficiency is
The efficiency of an ideal Carnot engine is one minus the ratio of the sink temperature to the source temperature, both in kelvin.
Read the full explanation →Food is cooked faster in a pressure cooker because
A cooker is sealed, so the steam it produces cannot escape and the pressure inside rises. Since the boiling point of a liquid rises with the pressure on it, water in a cooker boils well above a hundred degrees Celsius, and food cooking at that higher temperature is ready sooner.
Read the full explanation →The sudden bursting of an inflated tyre is an example of which kind of process?
An adiabatic change is one in which no heat is exchanged with the surroundings.
Read the full explanation →For a solid, the coefficients of linear, superficial and cubical expansion are in the ratio
If each length of a solid grows by a certain small fraction when it is heated, an area, which is the product of two lengths, grows by about twice that fraction, and a volume, the product of three lengths, by about three times.
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