Class 7 Science Chapter 4 MCQ (Multiple Choice Questions) of Heat. These Multiple Choice Questions with four choices contains about 120 questions divided into 12 sets in the format of test series, updated for new academic session 2023-24. 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 2023-24

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

### Class 7 Science Chapter 4 MCQ Tests for 2023-24

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.

Q1

#### 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
Q2

#### Paheli wants to know that what would happen if the temperature of two objects are same?

[A]. Heat transfer will be occurred between two objects
[B]. Heat transfer will not be occurred between two objects
[C]. Sometimes heat transfer sometimes not in both
[D]. No net energy transfer between two bodies
Q3

#### 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

[A]. Conduction
[B]. Convection
[D]. Semi convection
Q4

#### Cooking utensils are made of metals because they are

[A]. Durable
[B]. Malleable
[C]. Good conductors of heat
[D]. Do not break on heating
Q5

#### 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 then the temperature of the surroundings.
Q6

#### Which of the following is a poor conductor of heat?

[A]. Silver
[B]. Aluminum
[C]. Brass
[D]. Tungsten
Q7

[A]. Sir James Dewar
[B]. Sir Isaac Newton
[C]. Sir Thomas Alva Edison
[D]. Sir Antoine Lavoisier
Q8

#### Conviction may occur through

[A]. Solids, liquids
[B]. Liquids, gases
[C]. Solids, gases
[D]. Solids, liquids, gases
Q9

#### In which of the statement is or incorrect?

[A]. A clinical thermometer consists a non-uniform glass tube.
[B]. Thermometric liquids can be seen in clinical thermometer.
[C]. The temperature of every person may not be 37 degree Celsius.
[D]. All the above
Q10

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

[A]. Conduction
[B]. Convection
[D]. All the above.
Q11

#### Paheli wants to know about “heat”. Heat is

[A]. Form of energy
[B]. A type of matter
[C]. Neither energy nor matter
[D]. A form of fire
Q12

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

[A]. It is cheap and available everywhere.
[B]. As a digital it does not require any contact to measuring temperature.
[C]. It does not use of mercury.
[D]. Every point can be seen by a “beep sound”.
Q13

#### 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?

[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
Q14

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

[A]. Automatically it may break
[B]. It measures flame temperature
[C]. Sun temperature can be measured
[D]. Vapour can create under thermometer
Q15

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

[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
Q16

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

[A]. Becomes cold by the process of conduction
[B]. Becomes cold by the process of convection
[C]. Becomes cold by the process of radiation
[D]. Does not become cold
Q17

#### Paheli wants to know in which conditions clinical thermometer can be break?

[A]. When kept in Sun
[B]. When hits by hard objects
[C]. When dipped in hot tea
[D]. All the above
Q18

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

[A]. Clinical thermometer for measuring body tem. and laboratory thermometer for measuring the tem. of boiling water
[B]. Clinical thermometer for measuring temperature of both.
[C]. Laboratory thermometer for measuring temperature of both.
[D]. Digital thermometer for measuring temperature of both.
Q19

#### Paheli wants to measure the body temperature of Boojho. She got 36.4 degree Celsius, 37.4 degree Celsius and 36.6 degree Celsius in first, second and third times respectively. What is the average body temperature of Boojho?

[A]. 37.8 degree Celsius
[B]. 36.4 degree Celsius
[C]. 37.4 degree Celsius
[D]. 36.8 degree Celsius
Q20

#### 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
Q21

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

[A]. Heat is transferred by conduction
[B]. Heat is transferred by convection
[C]. Heat is transferred by radiation
[D]. Heat is transferred by all the process
Q22

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

[A]. It measures flame temperature
[B]. Sun temperature can be measured
[C]. Automatically it may break
[D]. Vapour can create under thermometer
Q23

#### Read the following statement carefully and choose which statement(s) are correct?

[A]. Clothes of white colour absorb more heat than blue colours.
[B]. Iron is the better conductor of heat than aluminium.
[C]. Our body is a poor conductor of electricity.
[D]. None of the above
Q24

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

[A]. Bulb can be burst
[B]. Thermometer will not work
[C]. Level of mercury decrease
[D]. None of the above
Q25

#### 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

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 in Class 7 Science Chapter 4?

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

### Which type of surfaces are good absorbers of heat as in 4th Chapter of Class 7 Science?

Black and rough surfaces are good absorbers of heat.

### Which type of surfaces are poor absorbers of heat according to 7th Science ch. 4?

White and smooth surfaces are poor absorbers of heat.

### Which scale is used for measuring heat in scientific work in Chapter 4 of 7th Science?

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

Last Edited: January 27, 2022