In which of the statement is or are correct about “thermometer”?

We are advised not to hold the thermometer bulb while reading it, as the level of mercury increases from the actual reading due to our body temperature.

Clinical thermometer can be break

There are many circumstances where clinical thermometer can break. Here, all the options are correct. Your answer will be option [D].

Boojho wonders why the level of mercury should change at all when the bulb of the thermometer is brought in contact with another object.

The temperature of another object may not be the same as that of the bulb of the thermometer. When bulb is brought in contact with that object, the temperature of the bulb changes. So, the level of mercury also changes.

Boojho wants to know that when a cold steel spoon is dipped in a cup of hot milk. It transfer heat to its other end by the process of

Conduction occurs when two objects at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature. Conduction is the movement of heat through a substance by the collision of molecules. This process continues until heat energy from the warmer object spreads throughout the cooler object, like the heat from the milk spreading throughout the metal spoon dipped in it. Hence, option [A] is correct.

Cooking utensils are made of metals because they are

We know that metals are good conductors of heat and electricity. Generally, in cooking utensils are made of metals because they are good conductors of heat. Here, option [C] is best suitable for this question.

Wooden spoon is used to prepare vegetables its other end

Wood, plastic are the non-conductor of heat and electricity. When wooden spoon is used to prepare vegetables, its other end does not become hot.

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

The air trapped between the layers of newspaper does not allow heat to pass through so it helps the beggar to keep himself warm.

Which of the following is a poor conductor of heat?

As we know, that gold and silver are the best conductor of heat and electricity whereas tungsten is a poor conductor of heat and electricity. Hence, your answer will be option [D].

Who invented thermos flask?

Thermo flask is a special kind of flask for keeping liquids. It prevents loss or gain of heat by any of the three methods. It keeps liquid warm or cold for a long time. It was invented by Sir James Dewar in 1893. He was a Scottish chemist and physicist.

Conviction may occur through

Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Heat energy is transferred from hot places to cooler places by convection. Hence, your answer will be option [B].

Which of the following statement is or are incorrect?

The SI unit of heat is Joule (J) and the SI unit of temperature is Kelvin (K). Only option [A] is incorrect. Here, rest of all statements are correct. Hence, your answer will be option [A].

The device which is used to measure the degree of coldness or hotness of an object.

Thermometer is a device which is used to measure the degree of coldness or hotness of an object. Rest all are incorrect. Hence, your answer will be option [C].

Which of the following statement is or are incorrect?

Mercury is the only metal which is found in liquid state at room temperature. Rest all are correct. Hence, your answer will be option [D].

Which of the following statement is or are incorrect?

A land which is surrounded by water heated not by convection. From the sun the heat comes to us by the process of radiation and heated all the objects which is present on the earth. Therefore, a land which is surrounded by water heated by radiation not by convection.

In which of the statement is or incorrect?

A clinical thermometer consists a uniform glass tube. Rest all the options are correct. Hence, your answer will be option [A].

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

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 a cool on a winter morning.

Paheli wants to know about “heat”. Heat is

Most of us use the word 'heat' to mean something that feels warm, but science defines heat as the flow of energy from a warm object to a cooler object. Heat spontaneously passes to its surroundings with medium or without any medium. Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases.

In which of the following statement is or are incorrect?

Here, all the statements are correct about “Heat”. Hence, your answer will be option [D].

Boojho wants to know that why it is advised to use digital thermometer?

There is a lot of concern over the use of mercury in thermometers. Mercury is a toxic substance and is very difficult to dispose of if a thermometer break. These days, digital thermometers are available which do not use mercury. Hence, your answer will be option [C].

Paheli and Boojho measured their body temperatures. Paheli found her’s to be 98.6 degree Fahrenheit and Boojho recorded 37° Celsius. Which of the following statement is true?

The temperature 37 degree Celsius is described in Celsius scale while the temperature 98.6 degree Fahrenheit is described in Fahrenheit scale but they are actually equal. Both these values represent the normal average temperature of a human body.

“We should avoid keeping the thermometer in the sun or near a flame”: Why?

Mercury is the only metal which is found in liquid state at room temperature and it expands when it receives heat. We should avoid keeping the clinical thermometer in the sun or near a flame because the clinical thermometer is designed to measure the temperature of human body only. This thermometer has the range of 35 degree Celsius to 42 degree Celsius. It may break in the sun or near a flame.

In which of the statement is or are correct?

Clinical thermometers or doctor's thermometer is a device which measures our body temperature. Rest all are incorrect. Hence, your answer will be option [A].

Wooden spoon is dipped in a cup of ice cream. Its other end

We know that wood is non-conductor of heat or cold. It acts as an insulator. So, when wooden spoon is dipped in a cup of ice cream its other end does not become cold. Hence, your answer will be option [D].

Boojho has three thermometers. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?

Clinical thermometer and digital thermometer are used to measure body temperature and laboratory thermometer is used to measure the temperature of boiling water or any object other than human body.

Stainless steel pans are usually provided with copper bottoms. The reason for this could be

After gold and silver, copper is a better conductor of heat than the stainless steel. And tungsten is worst conductor of heat which is used in electric bulb filament for its property of resistance. Hence, your answer will be option [C].

Once in a summer day, Paheli keeps an iron chair in sunlight. After few hours, iron chair gets heated because

The transfer of heat by radiation does not require any medium. It can take place whether a medium is present or not. From the sun the heat comes to us by this process which is known as radiation. When we sit in front of a room heater, we get heat by this process. All the objects are heated from the rays of sun by this process.

Why should we avoid keeping the thermometer in the sun or near a flame?

We know that Mercury is liquid at room temperature and expand with heat. Expansion may apply pressure to break it.

It is advised not to hold the thermometer by its bulb while reading it

We are advised not to hold the thermometer bulb while reading it, as the level of mercury increases from the actual reading due to our body temperature. Hence, your answer will be option [D].

Class 7 Science Chapter 4 MCQ

Class 7 Science Chapter 4 MCQ (Multiple Choice Questions) of Heat. These Multiple Choice Questions with four choices contains about 120 questions divided into 24 sets in the form of test series, updated for new academic session 2020-21.

All the questions are taken form NCERT Textbook and Exemplar books only. It covers the entire chapter 4 of grade 7 Science including all important terms.

Class 7 Science Chapter 4 MCQ for 2020-21

Class:	7
Subject:	Science
Contents:	Multiple Choice Questions – MCQ Tests

Class 7 Science Chapter 4 MCQ Tests for 2020-21

Class 7 Science Chapter 4 MCQ are given below with explanation of each answer. There are sufficient number of tests to practice chapter 4 of 7th Science. These tests make a student confident about the concepts related to standard 7 Science. Give test and practice with important questions if required. If you have more questions to ask, please visit to Discussion Forum.

Paheli and Boojho measured their body temperatures. Paheli found her to be 98.6 degree Fahrenheit and Boojho recorded 37° Celsius. Which of the following statement is true?

[A]. Paheli has a higher body temperature than Boojho

[B]. Paheli has a lower body temperature than Boojho

[C]. Both have normal body temperature

[D]. Both are suffering from fever

View Answer

Which type of heat transfer is actually minimized when using a thermo flask?

[A]. Conduction

[B]. Convection

[C]. Radiation

[D]. All the above.

Paheli wants to know that is it possible to construct building which are not affected by heat?

[A]. Building made by soil

[B]. Wooden bricks are used in the building

[C]. Hollow bricks are used for making building

[D]. White colored cement bricks are used in building

View Answer

Which of the following statements is or are incorrect?

[A]. Heat is a thermal condition of a body as energy.

[B]. Heat is the total amount of internal energy of a body.

[C]. In the transmission of heat temperature does not remain same.

[D]. All the above

One litre of water at 30 degree Celsius is mixed with one litre of water at 50 degree Celsius. The temperature of the mixture will be

[A]. 80 degree Celsius

[B]. More than 50 degree Celsius but less than 80 degree Celsius

[C]. 20 degree Celsius

[D]. Between 30 degree Celsius and 50 degree Celsius

View Answer

Start a New Test

Thermos flask

Thermos flask is a special type of vessel which keeps hot liquids hot and cold liquids cold. It is made in such a way as to reduce the loss of heat by conduction, convection and radiation to minimum. It is a double walled glass vessel. The space between the two walls has no air in it. It is a vacuum indeed. The inside of the outer wall and outside of the inner wall are brightly polished with silver. The whole system is enclosed in a metal case. It is supported on corks or rubber pieces on all sides. The mouth too is closed with a cork.

How it Works

The vacuum between the walls prevents the flow of heat of conduction and convection. As for radiation, the brightly polished outer surface of the inner wall is a slow radiator of heat. The little heat that radiates is reflected back by the inner brighter surface of the outer wall. So, the hot liquid remains hot for a long time in the flask.

What is thermometer?

The device which measures the degree of hotness is called thermometer.

Which type of surfaces are good absorbers of heat?

Black and rough surfaces are good absorbers of heat.

Which type of surfaces are poor absorbers of heat?

White and smooth surfaces are poor absorbers of heat.

Which scale is used for measuring heat in scientific work?

Temperature is generally measured in Celsius or Fahrenheit scale. Kelvin scale is used for scientific work.

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Class 7 Science Chapter 4 MCQ

Class 7 Science Chapter 4 MCQ for 2020-21

Class 7 Science Chapter 4 MCQ Tests for 2020-21

Paheli and Boojho measured their body temperatures. Paheli found her to be 98.6 degree Fahrenheit and Boojho recorded 37° Celsius. Which of the following statement is true?

Which type of heat transfer is actually minimized when using a thermo flask?

Paheli wants to know that is it possible to construct building which are not affected by heat?

Which of the following statements is or are incorrect?

One litre of water at 30 degree Celsius is mixed with one litre of water at 50 degree Celsius. The temperature of the mixture will be

Thermos flask

How it Works

What is thermometer?

Which type of surfaces are good absorbers of heat?

Which type of surfaces are poor absorbers of heat?

Which scale is used for measuring heat in scientific work?

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Class 7 Science Chapter 4 MCQ

Class 7 Science Chapter 4 MCQ for 2020-21

Class 7 Science Chapter 4 MCQ Tests for 2020-21

Paheli and Boojho measured their body temperatures. Paheli found her to be 98.6 degree Fahrenheit and Boojho recorded 37° Celsius. Which of the following statement is true?

Which type of heat transfer is actually minimized when using a thermo flask?

Paheli wants to know that is it possible to construct building which are not affected by heat?

Which of the following statements is or are incorrect?

One litre of water at 30 degree Celsius is mixed with one litre of water at 50 degree Celsius. The temperature of the mixture will be

Thermos flask

How it Works

What is thermometer?

Which type of surfaces are good absorbers of heat?

Which type of surfaces are poor absorbers of heat?

Which scale is used for measuring heat in scientific work?

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