Any architect will tell you that chimneys are never used as a weight-bearing part of a wall. Why?

Q: Why is Evaporation a Surface Phenomenon?

A: Evaporation is a surface phenomenon because, during evaporation, the molecules with higher kinetic…

Q: Material properties are not a function of temperature.   True or False?

A: False

Q: Woollen clothes are poor conductor of heat but they keeps us warm. Give reason

A: Woolen clothes are thin and there is no much air gap between the fabric. The air pockets lying in…

Q: In which form of heat transfer is a medium not required?

A: There are three ways of heat transfer. They are conduction, convection and radiation. Conduction is…

Q: The floor of a house on a foundation under which the aircan flow is often cooler than a floor that…

A: The thermal mass of a concrete floor is very high, meaning it has high specific heat and high heat…

Q: When you open the door to an air conditioned room in the summer are you letting cold air out or hot…

A: When the door to an air conditioned room in the summer is opened.   And we need to tell whether we…

Q: Show that 3000cal= 12,570J , the same quantity of thermal energy in different units.

A:

Q: Consider a bar 1 m long that expands 0.6 cm when heated. Show that when similarly heated, a 100-m…

A:

Q: What is the effect of temperature on surface tension?

A: Surface tension is the tension of the surface film of a liquid caused by the attraction of the…

Q: What is affect of changing the volume on (PV)?

A: According to Boyle's law, for an ideal gas PV = constant where, P is pressure and V is the volume of…

Q: Why does the high specific heat of water have to do with convection currents in the air at the…

A: Water has a high specific heat capacity (of 4200 J/Kg°C) on the seashore and the land has a much…

Q: Cite three examples in which Thermos bottle inhibits heat transfer?

A: The Thermos bottles use thermal isolation to prevent the transfer of the thermal energy or heat.

Q: The rate of heat flow by conduction through a slab does NOT depend upon the *

A: Heat flow is given by ∆Q∆t=-kA∆T∆x

Q: Why does the fire in fireplace burn more briskly on a windy day?

A: There are two reasons for the fire burns more briskly on a windy day. On a windy day, the wind…

Q: In summer cotton dresses should be preferred, Why?

A: Step 1During summers everyone tends to perspire a lot as a mechanism of our body to keep us cool.…

Q: Why is it safe to remain inside a car during a lightening storm?

A: During a lightning storm, it is safer to sit inside a car rather than standing under a tree. This…

Q: Why does a two-story house that is roughly a cube suffer less heat loss than a rambling one-story…

A: For a given volume, a one-story house has less surface area than a two-story house. As we know rate…

Q: Birds are often seen to swell their feathers in winters. Why?

A: Birds swelling their feathers is a mechanism to keep themselves warm during winter.

Q: Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.

A: Specific heat capacity is the amount of heat energy takes to raise or lower the temperature of one…

Q: Name the method of heat transfer which doesnot depend on gravity.

A: In radiation, heat is transferred without any motion of the medium particles

Q: Why does cold mountain air become warm when it descends into valley?

A: When the air descends, it gets compressed due to the adiabatic process.

Q: Why do frying pans have a thick base?

A: A thick base pan has higher mass hence higher heat capacity. A substance with large heat capacity…

Q: fire in the fire place by the heat transfer through A.

A: Heat can travel from one place to another in three ways - conduction, convection and radiation. In…

Q: What is advantage of linear thermopile?

A: The thermopile is an electronic device that is the combination or array of the several…

Q: What happens to steam pressure and velocity in a converging nozzle?

A: A nozzle is a mechanical instrument/device which is used to control the motion of the fluid flowing…

Q: Why are bottoms so that utensils for cooking food blackened?

A: Why are the bottoms of cooking utensils are blackened?Black color absorbs maximum amount of heat…

Q: What happens to the temperature of a pan of water when evaporation exceeds the condensation?

A: Evaporation and condensation can take place simultaneously. Evaporation causes cooling. This is…

Q: In a closed room dust generally settles down. Why?

A: Dust generally settles down in a closed room. The small dust particles acquire a very small terminal…

Q: Why is the condensation part of the cycle in a steam turbine so essential?

A:

Q: If water had a lower specific heat capacity, would ponds be more likely to freeze or less likely to…

A: A lower heat capacity means that less energy must be transferred to result in a temperature change.

Q: which phase changes require an overall energy loss

A: To break the cohesive bonds between molecules, energy is needed. Also, energy is required for…

Q: Heat always flows

A:

Q: The process of heat radiation is the ONLY method of heat transfer that can occur under water.…

A: The process of heat radiation is the ONLY method of heat transfer that can occur through space.

Q: If you were caught in freezing weather with only your own body heat as a source, would you be warmer…

A: In a freezing weather, only source of heat available is body temperature.

Q: An iron nail becomes hot when it is hammered, Why?

A: Whenever there is an increase in temperature of an object, it is due to the increase in the object’s…

Q: The woolen clothes keep us warm during winter because: Wool traps heat and cold Wool is available in…

A: Woolen clothes are bad conductor of heat and thus they give us warm during winter .

Q: Does heat flow into cold areas or does cold flow into hot areas?

A: Yes heat flows from hot to cold area or we can say it moves with the help of particle or atom. for…

Q: Distinguish between a calorie and a joule?

A: Both calorie and joule are the units of energy. The main difference in both the units is that a…

Q: Explain why the eruption of many geysers repeat with notable regularity?

A: Geyser is a spring involving intermittent, turbulent discharge of water that is accompanied by…