(e) What is bio fuel? Write any iwo examples
What is fossil fuel? Write any two uses of fossil fuels.
(a) What are the scales of measurement of temperature?
Heat is a form of energy. Justify
What are the effects of heat?
What happens when water is heated for a long time?
(k) Name any three devices that change electricity to heat energy
(1) The sense of hotness and coldness by touching does not always work
well. Explain
(m) What is a thermal expansion? Write its two merits and demerits each
(n) Abottle has a metallic cap which is very tightly closed and it cannot be
opened easily by applying force to rotate it. How can you open it?
Differentiate between
(a) heat and temperature
(b) expansion of solid and liquid
c) bio-fuels and fossil fuel
Answers
Answer:
e)biofuel is a fuel that is produced through contemporary processes from biomass, rather than a fuel produced by the very slow geological processes involved in the formation of fossil fuels, such as oilExamples of biofuels include ethanol (often made from corn in the United States and sugarcane in Brazil), biodiesel (sourced from vegetable oils and liquid animal fats), green diesel (derived from algae and other plant sources), and biogas (methane derived from animal manure and other digested organic material).
a)The three main temperature scales are Celsius, Fahrenheit, and Kelvin. Temperatures can be converted from one scale to another using temperature conversion equations. The three phases of water (ice, liquid water, and water vapor) can coexist at a single pressure and temperature known as the triple point.
Heat or thermal energy is the form this energy possesses when it is being transferred between systems and surroundings. There is nothing material about heat. ... Heat is a form of energy that can be transferred from one object to another or even created at the expense of the loss of other forms of energy.
Prolonged exposure to extreme heat can cause heat exhaustion, heat cramps, heat stroke, and death, as well as exacerbate preexisting chronic conditions, such as various respiratory, cerebral, and cardiovascular diseases.
An increase in temperature caused the water molecules to gain energy and move more rapidly, which resulted in water molecules that are farther apart and an increase in water volume. ... When water is heated, it expands, or increases in volume. When water increases in volume, it becomes less dense.
k)An electric iron converts electrical energy into heat energy.
1)You feel hot on one hand and cold on other hand . because if the hotness should more it will give it increase the temperature of earn water but it is not so because you have taken out hands from your and cold water. So it is reliable .
m)Thermal expansion is the tendency of matter to change its shape, area, volume, and density in response to a change in temperature, usually not including phase transitions. Temperature is a monotonic function of the average molecular kinetic energy of a substance.
The thermal expansion valve is the part within the car's cooling system that regulates the cool air that flows in through the vents. Many car owners choose to install this piece as an aftermarket item to help the flow of refrigerant that is used in the cooling process. Here are some advantages that make the thermal expansion valve an important buy.
n)Static friction opposes motion of the object while it is not moving. Dynamic friction is what opposes motion of the object while it is moving. In a closed lid, turning the bottle cap requires more force because the static friction requires a large force to overcome that friction.
differentiation:-
a)The difference between heat and thermal energy is that thermal energy is not in the process of being transferred; it is not in transit, but remains as part of the internal energy of the system; heat, on the other hand, is energy in transit, i.e. energy in the process of being transferred from a hotter system towards ...
b)In a liquid, the expansion is a little more than in solids. The bonds in a liquid are weaker than in a solid, so as you heat up a liquid, the particles can move around each other faster and in so doing, move further apart. Solids and liquids occupy a 'set' volume at a certain temperature.
c)Biofuels are renewable, whereas fossil fuels are nonrenewable. Biofuels are mostly grown from modern grains or the organic residues of modern plants, whereas the organisms that fossil fuels are made from have been dead for millions of years.
Explanation:
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