Tag: sources of heat

Questions Related to sources of heat

Heat energy produces a sensation of-

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. warmth

  2. coldness

  3. both warmth and coldness

  4. none of these

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Correct Option: A
Explanation:
Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
Heat energy produces a sensation of warmth

State whether given statement is True or False
A wooden chair feels colder than an iron chair in winter

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. True

  2. False

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Correct Option: B
Explanation:

Metal conducts heat much better than wood does. Since your hand is hotter than room temperature, both the metal and the wood conduct heat away from it.an iron chair in winter feels colder

State whether given statement is True or False :

Mud houses are hot in summer and cold in winter.

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. True

  2. False

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Correct Option: B
Explanation:

Mud houses have thatched roofs. The insulating effect of the thatch prevents heat from getting in very quickly (cool in summer) and heat getting out very quickly (warm in winter). Secondly, mud houses are made up of mud, which has large pores. As evaporation causes cooling, mud houses feel cooler in summer 

This is why mud houses are cool in summer and hot in winter.

Heat will flow from

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. Hot body to cold body

  2. Cold body to hot body

  3. two bodies at the same temperature

  4. None of these

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Correct Option: A
Explanation:

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient. If there is a temperature difference in a system, heat will always move from higher to lower temperatures.Heat will flow from Hot body to cold body

Beaker A contains hot water. Beaker B contains cold water. Beaker C contains a mixture of hot and cold water. If initially your hand is put into a beaker containing ice, then putting your hand in which of the beakers A, B or C will give a sensation of warmth?  

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. A

  2. B

  3. C

  4. All of the above.

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Correct Option: D

A thermostat is?

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. A device used to maintain a constant temperature of a water bath or an oven

  2. A modern type of thermoflask which work on the principle of equipartition of heat energy

  3. An instrument by which the accuracy of thermometers is determined

  4. A device which varies the temperature of a both

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Correct Option: A
Explanation:

A thermostat is a device that automatically regulates temperature, or that activates a device when the temperature reaches a certain point.

Thus, it can be used to maintain a constant temperature of a water bath or an oven.
Hence, option A is correct.

Reading of temperature may be same on

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. Celsius and kelvin scale

  2. Fahrenheit and Celsius scale

  3. Kelvin scale

  4. None of these

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Correct Option: B

Three liquids A, B and C are at temperature of $60^{o}C, 55^{o}C$ respectively $4g$ of A mixed with $3g$ of C gives $65^{o} C$ and $2g$ of A mixed with $3g$ of B gives $57^{o}C$. The temperature of the mixture when equal masses of $B$ and $C$ are mixed is 

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. $52.1^{o}C$

  2. $55^{o}C$

  3. $52.5^{o}C$

  4. $53^{o}C$

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Correct Option: A

The temperature of equal masses of three different liquids $A, B$ and $C$ are $12^{o}C, 19^{o}C$ and $28^{o}C$ respectively. the temperature when A and B are mixed is $16^{o}C$, when B and C are mixed is $23^{o}C$ what is the temperature when A and C are mixed 

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. $31^{o}C$

  2. $20.26^{o}C$

  3. $19.5^{o}C$

  4. $28^{o}C$

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Correct Option: A

The standard fixed point for temperature measurement is used these days is :

physics heat - measurement sources of heat introduction to heat measuring temperature

  1. melting point of ice at S.T.P.

  2. that temperature at which ice, water and water vapour coexist

  3. that temperature at which pure ice and pure water coexist

  4. none of the above

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Correct Option: B
Explanation:

(B)The triple point of a substance is unique, i.e. it occurs at one particular set of values of pressure and temperature. The melting point of ice and boiling point of water are not unique. They change with change in value of pressure or due to the presence of impurities in water.