Question

Class 7 Science MCQ Question of Heat with Answers?

Answer 1

Practice free Class 7 Science MCQ Question of Heat with Answers are available here . Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. These MCQ Questions are selected supported by the newest exam pattern as announced by CBSE. We have compiled the MCQ Questions for Class 7 Science Heat with Answers covering the entire syllabus.

Students also can take a free test of the Multiple Choice Questions of Class 7 science. Each question has four options followed by the right answer. This may assist you to understand and check your knowledge about the chapters. Have a look at the MCQ Questions Class 7 Science and cross-check your answers during preparation.

Practice MCQ Questions for Class 7 Science

1. Which one of the following is a reliable measure?

(a) Hotness
(b) Coldness
(c) Temperature
(d) None of these

2. Name the device which is used to measure the hotness or coldness of an object.

(a) Picometer
(b) Barometer
(c) Manometer
(d) Thermometer

3. Which one is filled in the bulb of a thermometer?

(a) Mercury
(b) Lead
(c) Copper
(d) Silver

4. What is the normal temperature of a healthy person?

(a) 37°C
(b) 37°F
(c) 37 K
(d) None of these

5. Heat always flows

(a) from a colder object to a hotter object
(b) from a hotter object to a colder object
(c) in both the directions
(d) heat never flows from one object to other

6. Conduction is the method of transfer of heat in

(a) liquids
(b) solids
(c) gases
(d) vacuum

7.  Heat from the sun reaches to us by

(a) radiation
(b) conduction
(c) convection
(d) all of these

8. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because:

(a) friction between the layers of newspaper produces heat.
(b) air trapped between the layers of newspaper is a bad conductor of heat.
(c) newspaper is a conductor of heat.
(d) newspaper is at a higher temperature than the temperature of the surrounding.

9. A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile:

(a) is a better conductor of heat than the wooden tile.
(b) is polished while wooden tile is not polished.
(c) reflects more heat than wooden tile.
(d) is a poor conductor of heat than the wooden tile.

10. Which of the following is a insulator

(a) Graphite
(b) Air
(c) Aluminium rod
(d) Copper rod

11. Stainless steel pans are usually provided with copper bottom. The reason for this could be that:

(a) copper bottom makes the pan more durable
(b) such pans appear colourful
(c) copper is easier to clean than stainless steel
(d) copper is a better conductor of heat than the stainless steel

12. The correct method of reading a clinical thermometer is:

(a) holding the thermometer by bulb
(b) before use the mercury level should be below 39°C
(c) don’t hold the thermometer by bulb
(d) none of these

13. The substances which conduct heat easily are called:

(a) convection
(b) radiation
(c) conductors
(d) none of these

14. The phenomenon involved in the formation of land and sea breeze is:

(a) conduction
(b) convection
(c) radiation
(d) all of these

15. Which thermometer is used to measure temperature of different things and places ?

(a) Laboratory thermometer
(b) Clinical thermometer
(c) Minimum and maximum thermometer
(d) None of these

16. Which of the following substance is not a bad conductor of heat ?

(a) Rubber
(b) Aluminium
(c) Glass
(d) Plastic

17.  Land breeze blows from

(a) lower surface to upper surface
(b) sea to land
(c) upper surface to lower surface
(d) land to sea

18. Which type of cloth is preferred in summer?

(a) Silk clothes
(b) Cotton clothes
(c) Nylon clothes
(d) Polyester clothes

19. Which colour absorbs more heat?

(a) Black
(b) White 
(c) Blue
(d) Red

20. Light coloured clothes are preferred during:

(a) winter
(b) summer
(c) rain
(d) none of these

21. Which thermometer records the highest and lowest temperature during a period of time ?

(a) Clinical thermometer
(b) Laboratory thermometer
(c) Minimum and maximum thermometer
(d) None of these

22. Heat is a form

(a) Power
(b) Work
(c) Temperature
(d) Energy

23. 10°C is equal to

(a) 173 K
(b) 273 K
(c) 283 K
(d) 183 K

24. Thermos flask keeps hot liquid hot and cold liquid cold by

(a) Cooling
(b) Using coolant
(c) Preventing heat loss
(d) Heating

25. Process of change of state from gaseous state to liquid state is called

(a) freezing           
(b) sublimation
(c) boiling             
(d) condensation

Answer 2

1. Answer: (c) Temperature

Explanation: A reliable measure of the hotness of an object is its temperature.

2. Answer: (d) Thermometer

Explanation: Thermometer is used to measure temperature. The degree of hotness or coldness of a body is temperature.

3. Answer: (a) Mercury

Explanation:  Mercury is filled in the bulb of a thermometer.

4. Answer: (a) 37°C

Explanation: The average normal body temperature is generally accepted as 98.6°F (37°C). 

5. Answer: (b) from a hotter object to a colder object

Explanation: According to the second law of thermodynamics, heat will always from higher temperature to lower temperature, since the entropy never decreases over time.

6. Answer: (b) solids

Explanation: The method of transfer of heat in solids is called Conduction.

7. Answer: (a) radiation

Explanation: Heat from the Sun reaches is by the process of radiation. As we know radiation do not need any material medium for heat transfer.

8. Answer: (b) air trapped between the layers of newspaper is a bad conductor of heat.

Explanation: But the air molecules are not in a continuous contact and thus, the air trapped between the layers of newspaper does not conduct the heat. Thus, the layers of newspaper helped beggar to keep himself warm because the air trapped between the layers of newspaper is a bad conductor of heat.

9. Answer: (a) is a better conductor of heat than the wooden tile.

Explanation: Since, a marble tile is a good conductor of heat as compared to the wood, therefore a marble tile will allow heat to pass through itself easily, keeping it cool on a winter morning.

10. Answer: (b) Air

Explanation: The conductors are – Silver, copper, Aluminum, Nichrome, Graphite, Manganin, Mercury. The insulators are – Cotton, Air, Porcelain, Mica, Bakelite, Polyethylene, Sulfur.

11. Answer: (d) copper is a better conductor of heat than the stainless steel

Explanation: Stainless steel pans are usually provided with copper bottoms because copper is a better conductor of heat than stainless steel hence cooking of food becomes faster.

12. Answer: (c) don’t hold the thermometer by bulb

Explanation: It advised not to hold the thermometer by its bulb while reading it because the actual reading of human body temperature will get affected. This is for the reason that level of Mercury raises due to human body temperature.

13. Answer: (c) conductors

Explanation: The substances which conduct heat easily is called conductor. Heat is transferred from hotter end to colder end is known as conduction.

14. Answer: (b) convection

Explanation:: Land breezes and sea breezes arise because of differential heating between land and water surfaces. Moreover, the lower heat capacity of crustal materials often allows them to cool below the nearby water temperature. Air above the respective land and water surfaces is warmed or cooled by conduction with those surfaces

15. Answer: (a) Laboratory thermometer

Explanation: A laboratory thermometer, which is colloquially known as the lab thermometer, is used for measuring temperatures other than the human body temperature. It ranges from -10˚C to 110˚C. Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point, or temperature of other substances.

16. Answer: (b) Aluminium

Explanation: Some metals are better conductors of electricity than others. Silver, gold, copper, and aluminium are materials with free electrons and make good conductors. Silver is the best conductor of electricity, followed by copper, gold, and aluminium. Hence, Aluminium is a good conductor of electricity.

17. Answer: (d) land to sea

Explanation:  A land breeze is a type of wind that blows from the land to the ocean. When there is a temperature difference between the land surface and the ocean, winds will move offshore. As the temperature of the land surfaces cool, the warm air rises and creates a small area of high pressure near the land surface.

18. Answer: (b) Cotton clothes

Explanation: Cotton is one the best fabrics for hot weather. Not only is it cheap and hugely available, but it is also great for the heat. Cotton is soft, lightweight, breathable, and soaks up sweat, allowing heat to escape the body and for you to stay cool.

19. Answer: (a) Black

Explanation: The more light the object absorbs, the more heat absorbed since light is energy. If you consider it a color, black absorbs the most heat. A black object absorbs all wavelengths of light and reflects none. Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the least heat.

20. Answer: (b) summer

Explanation: Light colours are poor absorbers of heat. Light-coloured clothes are preferred in summer because Light colours are poor absorbers of heat. We wear light coloured clothes in summer because light colours reflect heat which helps our body to keep cool.

21. Answer: (c) Minimum and maximum thermometer

Explanation: Six's maximum and minimum thermometer is a registering thermometer that can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. It is used to record the extremes of temperature at a location, for instance in meteorology and horticulture.

22. Answer: (d) Energy

Explanation: Heat as a form of energy because all of the many forms of energy, including heat, can be converted into work, amounts of energy are expressed in units of work, such as joules, foot-pounds, kilowatt-hours, or calories.

23. Answer: (c) 283 K

Explanation: We know, 

K=C+273

K = 10°C + 273

= 283K

24. Answer: (c) Preventing heat loss

Explanation: The silver coated surface becomes shiny, so it reflects all the heat inside the wall, and it does not allow the heat to go out. And the layer of glass wall thermo flask is thin, so it prevents the loss of heat by conduction. Therefore, the thermo flask keeps cold liquid cold and hot liquid hot.

25. Answer: (d) condensation

Explanation: Condensation is the change of a substance from its gaseous form into its liquid state.

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