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 format 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
|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.
In which of the statement is or are correct about “thermometer”?
Wooden spoon is used to prepare vegetables its other end
Who invented thermos flask?
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?
“We should avoid keeping the thermometer in the sun or near a flame”: Why?
Boojho has three thermometers. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?
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?
Once in a summer day, Paheli keeps an iron chair in sunlight. After few hours, iron chair gets heated because
At a campsite there are tents of three shades. One made with black fabric and other is white fabric and one is black and white combination. Which will you prefer for resting on a hot summer afternoon?
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.