When two objects are in thermal contact, the heat is transferred by ………………
- Aconvection
- Bradiation
- ✓conduction
- Dnone
Answer: C.
View full solution →Question types
Heat. question types
111 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
111
Questions
9
Question groups
5
Question types
01
M C Q
17 Q→02Fill in the blank with correct answer.[1 Mark each]
21 Q→03true or false.[1 Mark each]
21 Q→04Assertion & Reason
6 Q→05[1 Mark Questions]
5 Q→06[2 Mark Questions]
29 Q→07Match The Following.
5 Q→08[4 Mark Questions]
6 Q→09[7 marks Questions]
1 Q→Sample Questions
Heat. questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Substances which allow heat to pass through them are called …………….
- ✓conductors
- Binsulators
- Cmoderators
- Dnone
Answer: A.
View full solution →Process of change of state from gaseous state to liquid state is called …………….
- Afreezing
- ✓condensation
- Csublimation
- Dboiling
Answer: B.
View full solution →Mud houses are cooler in summer and warmer in winter because –
- Amud is a bad conductor of heat
- Bmud is a good conductor of heat
- ✓mud is a super conductor of heat
- Dnone
Answer: C.
View full solution →In conduction, heat flows from ………………
- Ahotter to hotter region
- Bcolder to hotter region
- ✓hotter to colder region
- Dcolder to colder region
Answer: C.
View full solution →Black color is a ……………….. absorber of heat.
The handles of cooking utensils are made of …………………
The water in the black can becomes ……………….. than that in white can after exposing to the sun.
Vacuum flask is also called as …………………
The vacuum flask was invented by …………………
Thermostat is a device can measure the heat capacity of the liquid in the container.
In thermos flask, the vacuum between the two walls prevents heat from the inside to the outside by radiation.
Metals like copper, aluminium are good conductors of heat and electricity.
The transfer of heat by radiation does not require any medium.
In summer, we prefer light – colored clothes and in winter we usually wear dark – colored clothes.
Assertion : Small gaps left between railway lines.
Reason : It allows for contraction of rails during summer.
Reason : It allows for contraction of rails during summer.
- ABoth assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but reason is not the correct explanation of the assertion.
- ✓The assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: C.
View full solution →Assertion : Temperature is the measure of the heat energy.
Reason : Energy is the capacity to do work.
Reason : Energy is the capacity to do work.
- ABoth assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but reason is not the correct explanation of the assertion.
- CThe assertion is true, but the reason is false.
- ✓The assertion is false, but the reason is true.
Answer: D.
View full solution →Assertion : Radiation is a process of transfer of heat in which a material medium is not necessary.
Reason : The heat from the sun reaches us through millions of miles of empty space by convection.
Reason : The heat from the sun reaches us through millions of miles of empty space by convection.
- ABoth assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but reason is not the correct explanation of the assertion.
- ✓The assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: C.
View full solution →Assertion : When a very hot liquid is poured into a thick glass tumbler it cracks.
Reason : Unequal expansion of the inner and outer glass walls causes the glass to crack.
Reason : Unequal expansion of the inner and outer glass walls causes the glass to crack.
- ✓Both assertion and reason are true and the reason is the correct explanation of the assertion.
- BBoth assertion and reason are true, but reason is not the correct explanation of the assertion.
- CThe assertion is true, but the reason is false.
- DThe assertion is false, but the reason is true.
Answer: A.
View full solution →Consider the statement given below and choose the correct option.
Assertion: A system can be converted from one state to another state.
Reason: It takes place when the temperature of the system is constant.
Assertion: A system can be converted from one state to another state.
Reason: It takes place when the temperature of the system is constant.
- ✓Both assertion and reason are true and reason is the correct explanation of assertion.
- BBoth assertion and reason are true, but reason is not the correct explanation of assertion.
- CAssertion is true, but the reason is false.
- DAssertion is false, but the reason is true.
Answer: A.
View full solution →Why does the bottom of a lake not freeze in severe winter though the surface is all frozen?
Define one calorie.
Define specific heat capacity.
Write a note on convection.
What is conduction?
An iron ball requires 9000 J heat energy to raise its temperature by 10°C. Calculate the heat capacity of the iron bail.
A body of mass 750 g requires 13,500 J of heat energy in order to raise its temperature from 25 °C to 55 °C. Calculate its specific heat capacity.
What is the rise in temperature of 5 kg of water if it is given $84,000 J$ heat energy? Specific heat capacity of water $4200 J Kg ^{-1}{ }^{\circ} C ^{-1}$.
View full solution →Distinguish between evaporation and vaporization.
| 1. | Solid to liquid | (a) | Condensation |
| 2. | Liquid to gas | (b) | Deposition |
| 3. | Gas to solid | (c) | Melting |
| 4. | Gas to liquid | (d) | Vaporization |
| 1. | Conduction | (a) | liquids and gases |
| 2. | Convection | (b) | Poor conductor |
| 3. | Radiation | (c) | Solids |
| 4. | Snow | (d) | Vacuum |
| 1. | Specific heat capacity | (a) | Dewar bottle |
| 2. | Calorimeter | (b) | Lavoisier and simon |
| 3. | Vacuum flask | (c) | $JKg ^{-1} K^{-1}$ |
| 4. | Ice – calorimeter | (d) | Heat capacity |
| 1. | Heat | (a) | Good absorber |
| 2. | Temperature | (b) | Form of energy |
| 3. | Black surface | (c) | Insulators |
| 4. | Rubber, cork | (d) | Measure of hotness or coldness |
Match the following.
| Conduction | Liquid |
| Convection | Gas to liquid |
| Radiation | Solid to gas |
| Sublimation | gas |
| Condensation | Solid |
Distinguish between heat and temperature.
Write the difference between conduction, convection, and radiation.
Write a note on radiation.
Describe an experiment to prove that solids expands on heating and contract on cooling.
Explain the working of thermos flask.
With the help of a neat diagram, explain the working of a calorimeter.
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