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

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.
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

In which of the following statement is or are incorrect?

[A]. Heat is a form of energy.
[B]. Heat flows from one object to another object when there is a difference in temperature.
[C]. In the transmission of heat total amount of heat remains unchanged.
[D]. None of the above




Q4

An iron ball at 40 degree Celsius is dropped in a mug containing water at 40 degree Celsius. The heat will

[A]. Flow from iron ball to water
[B]. Not flow from iron ball to water or from water to iron ball
[C]. Flow from water to iron ball
[D]. Increase the temperature of both
Q5

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



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.