Heat Flow and Temperature (Class VII)
| Description: Heat Flow and Temperature | |
| Number of Questions: 15 | |
| Created by: Chandra Bhatti | |
| Tags: Heat Flow and Temperature Conduction Convection Radiation Crystallization Common Types of Chemical Changes Physical Changes and Its Characteristics Heat Transfer by Radiation Concept of Temperature Range of a Laboratory Thermometer Limitations of Laboratorical Thermometer and Clinical Thermometer Heat Equipments for Measuring Temperature Examples of Good Conductors and Poor Conductors |
Temperature is the degree of hotness or coldness of a body. The S.I. unit of temperature is
The range of a common thermometer used in laboratories is between
Which of the following statements is/are false?
a. It is the flow of heat energy into our body that makes us feel hot or warm. b. The energy transferred from one body to another body due to a temperature difference between them is called heat. c. The human sensation of touch is very reliable to find the degree of hotness or coldness of a body.
The substances that allow heat energy to flow through them easily are called good conductors. Which of the following is a good conductor of heat?
In which of the following medium(s) is convection not possible?
a. Liquid b. Solid c. Gases
The radiant heat is a kind of electromagnetic energy. It travels in space at a speed of
Which of the following statements is/are false?
a. Radiation is the fastest mode of heat transfer from a hot body to a cold body. b. The process by which impure and warm air inside a room is continuously replaced by fresh air from outside is called ventilation. c. Good conductors help in the conservation of energy in a system.
One feels more comfortable to wear white or light coloured clothes in hot summers because light coloured clothes are
Which of the following statements is/are false?
a. Conduction starts once the two objects or the parts of the same object have attained the same temperature. b. Cooling coils of air conditioners are made of copper as they readily conduct away heat. c. Heat energy does flows through bad conductors, but at a very small rate as compared to good conductors.
Which of the following statements is/are false?
a. Maximum and minimum temperatures of the previous day, reported in weather reports are measured by a thermometer called bimetallic thermometer. b. A thermometer that is used by doctors to measure temperature of his patients is known as clinical thermometer. c. The thermometer that consists of a very fine glass tube having a very small bore called a capillary tube.
Celsius thermometer cannot measure higher temperatures like that of a candle flame because in that case,
Which of the following requires no medium to travel?
a. Conduction b. Convection c. Radiation
Which of the following is not a precaution that should be observed while reading the laboratory thermometer?
Which of the following is the best conductor of heat?
Match the following:
| a. Conduction | 1. It is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium. |
| b. Convection | 2. It is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium. |
| c. Radiation | 3. It is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium. |