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.

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

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

[A]. Conduction
[B]. Convection
[C]. Radiation
[D]. All the above.
Q3

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
Q4

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
Q5

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

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.