Principle of Heat Exchange

Q. According to the principle of heat exchange, heat lost by the hot object is the heat gained by the cold object.

1. equal to
2. greater than
3. lesser than

Q.

The process of transfer of heat through a substance without any motion of the particles is called conduction.

1. True

2. False

Q.

If two objects are in thermal equilibrium with each other

1. They can’t be moving

2. They can’t be undergoing an elastic collision

3. They can’t have different pressures

4. They can’t be at different temperatures

Q.

Heat flows from a region of __________ temperature to a region of ________temperature.

Q. Heat is equivalent to which of the following quantities?

1. Work
2. Charge
3. Electric Potential
4. Energy

Q. When two or more bodies at different temperatures are brought into thermal contact, then the net heat lost by the bodies is equal to the heat gained by the cold bodies until they attain thermal equilibrium. This is known as

1. Thermal equilibrium
2. Principle of method of mixtures
3. Specific heat of solid
4. Calorimetry

Q.

Heat transfer through conduction is ___.

1. an exchange of mass

2. an exchange of potential energy of particles

3. an exchange of kinetic energy of particles

4. an exchange of density of particles

Q.

Heat is always transferred from an object at ______ temperature to an object at ________ temperature.

Q. How much heat energy is required to rise the temperature of 100 g of water by 20 K?

1. 
   8.4 J
2. 
   84 J
3. 
   8.4 kJ
4. 
   840 kJ

Q. How does the dark or light colour of an object affect the amount of heat it radiates or absorbs?

(a) Dark colour objects absorb and radiate more heat than light coloured objects.
(b) Dark colour objects absorb more but radiate less heat than light coloured objects.
(c) Dark colour objects absorb less and radiate more heat than light coloured objects.
(d) Dark colour objects absorb and radiate the same amount of heat as light coloured objects.

Q.

When there is no change of state in a process, which of the following is not required to calculate the heat lost or gained in the process?

1. Weight

2. Specific heat

3. Relative density

4. Temperature change

Q. An iron block of mass $1kg$ is heated to $300{}^{\circ }C$. If it is immersed in $1kg$ of water at $30{}^{\circ }C$, then what will be the change in temperature of water (in ${}^{\circ }C)$?
$[$specific heat capacity of iron : $460Jk{g}^{-1}{K}^{-1}$, water: $4200Jk{g}^{-1}{K}^{-1}]$

1. $29{}^{\circ }C$
2. $26.65{}^{\circ }C$
3. $243.35{}^{\circ }C$
4. $23.65{}^{\circ }C$

Q.

Heat energy lost by a hot body is not equal to heat energy gained by the surroundings.

1. True

2. False

Q. Assertion :Both work and heat are manifested by an effect on the surroundings. Reason: Work done by/on the system and $\Delta H$ appear only at the boundary of system.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Assertion is incorrect but Reason is correct.

Q. What is the value of latent heat?

Q.

When does thermal conduction take place?

1. Bodies should be at the same temperature.

2. Bodies should be at different temperatures.

3. Particles of the substance should be in motion.

4. Particles of the substance should be in rest.

Q.

When two bodies A and B are brought in contact with each other, heat does not flow between them. When another body C is brought in contact with B, the heat starts flowing from C to B. After the heat flow stops, C is now brought into contact with A, then which of the following is correct?

1. Heat flows from A to C.

2. Heat flows from C to A.

3. No heat flows between A and C.

4. Heat first flows from A to C and then from C to A.

Q.

The direction of heat transfer depends on which of the following?

1. Mass of each body.

2. Amount of heat contained in each body.

3. Shape and size of the body.

4. Temperature of each body.

Q. Heat energy lost by hot object is equal to heat enegy gained by cold object describes which principle?

1. Principle of conservation of energy.
2. Principle of heat exchange.
3. Principle of conservation of mass.
4. Principle of conservation of momentum.

Q.

Difference in ________ determines the flow of heat between two bodies.

1. pressure

2. temperature

3. volume

4. heat content

Q. The temperature of equal masses of three different liquids $A$, $B$, $C$ are ${12}^{\circ }C$, ${19}^{\circ }C$ and ${28}^{\circ }C$ respectively. The temperature when $A$ and $B$ are mixed is ${16}^{\circ }C$ while when $B$ and $C$ are mixed, it is ${23}^{\circ }C$. What would be the temperature when $A$ and $C$ are mixed assuming the same initial temperatures?

1. ${20.26}^{\circ }C$

2. ${30.26}^{\circ }C$

3. ${40.26}^{\circ }C$

4. ${10.26}^{\circ }C$