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Heat Class 7 MCQs Questions with Answers
I. Choose the correct option.
Question 1.
Which of the following is a good conductor of heat?
(a) Iron
(b) Steel
(c) Aluminium
(d) All of these
Answer
Answer: (d) All of these
Question 2.
A device used to measure the temperature is
(a) transistor
(b) thermometer
(c) mercury
(d) none of these
Answer
Answer: (b) thermometer
Question 3.
Which of the following thermometers has a kink?
(a) Laboratory thermometer
(b) Clinical thermometer
(c) Both (a) and (b)
(d) Digital thermometer
Answer
Answer: (b) Clinical thermometer
Question 4.
What is the range of the temperature reading of a clinical thermometer?
(a) 35°C – 42°C
(b) -10°C – 110°C
(c) 0°C – 100°C
(d) 32°C – 42°C
Answer
Answer: (a) 35°C – 42°C
Question 5.
Which of the following thermometer contains mercury?
(a) Clinical thermometer
(b) Laboratory thermometer
(c) Both (a) and (b)
(d) None of these
Answer
Answer: (c) Both (a) and (b)
Question 6.
What is the range of the temperature reading of a laboratory thermometer?
(a) -10°C – 110°C
(b) 35°C – 42°C
(c) 0°C – 100°C
(d) -10°C – 100°C
Answer
Answer: (a) -10°C – 110°C
Question 7.
The transfer of heat from hotter body to colder body is called
(a) conduction
(b) induction
(c) convection
(d) radiation
Answer
Answer: (a) conduction
Question 8.
The process of transferring of heat without any contact between the source of heat and the heated object is called
(a) conduction
(b) convection
(c) radiation
(d) induction
Answer
Answer: (c) radiation
Question 9.
The normal temperature of human body is
(a) 35°C
(b) 37°C
(c) 40°C
(d) 42°C
Answer
Answer: (b) 37°C
Question 10.
The materials which allow the heat to pass through them easily are called
(a) insulators
(b) conductors
(c) semiconductors
(d) poor conductors
Answer
Answer: (b) conductors
Question 11.
Which of the following is an insulator?
(a) Wood
(b) Iron
(c) Copper
(d) Zinc
Answer
Answer: (a) Wood
Question 12.
The air from the sea is called
(a) sea breeze
(b) land breeze
(c) wind
(d) none of these
Answer
Answer: (a) sea breeze
Question 13.
Which colour absorbs more heat?
(a) Black
(b) White
(c) Blue
(d) Red
Answer
Answer: (a) Black
Question 14.
What is the SI unit of temperature?
(a) Kelvin
(b) Celsius
(e) Fahrenheit
(d) None of these
Answer
Answer: (a) Kelvin
Question 15.
Which one is filled in the bulb of a thermometer?
(a) Mercury
(b) Lead
(c) Copper
(d) Silver
Answer
Answer: (a) Mercury
Question 16.
A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
(a) is a better conductor of heat than the wooden tile.
(b) is polished while wooden tile is not polished.
(e) reflects more heat than wooden tile.
(d) is a poor conductor of heat than the wooden tile.
Answer
Answer: (a) is a better conductor of heat than the wooden tile.
Question 17.
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 than the temperature of the surrounding.
Answer
Answer: (b) air trapped between the layers of newspaper is a bad conductor of heat.
Question 18.
Sonu and Ria measured their body temperature Sonu found his to be 98.6°F and Ria recorded 37°C. Which of the following statement is true?
(a) Sonu has a higher body temperature than Ria.
(b) Sonu has a lower body temperature than Ria.
(c) Both have normal body temperature.
(d) Both are suffering from fever.
Answer
Answer: (c) Both have normal body temperature.
Question 19.
Four arrangements to measure temperature of ice in beaker with laboratory thermometer are shown in Figure 4.13 (a, b, c and d). Which one of them shows the correct arrangement for accurate measurement of temperature?
Answer
Answer: (a)
Question 20.
Figure 4.14 (a-d) shows the readings on four different thermometers. Indicate which of the reading shows the normal human body temperature?
Answer
Answer: (c)
II. Fill in the Blanks
Question 1.
A reliable measure of the hotness of an object is known as ………………
Answer
Answer: temperature
Question 2.
……………… is used to measure the hotness or coldness of our body.
Answer
Answer: Thermometer
Question 3.
Boiling and melting point of water is ……………… and ……………… respectively.
Answer
Answer: 100°C, 0°C
Question 4.
The transfer of heat from hotter body to colder body is called ………………
Answer
Answer: conduction
Question 5.
The normal temperature of human body is ……………… °C.
Answer
Answer: 37
Question 6.
……………… is a good conductor of heat.
Answer
Answer: Iron
Question 7.
……………… is the SI unit of temperature.
Answer
Answer: Kelvin
Question 8.
……………… prevents mercury level from falling on its own.
Answer
Answer: Kink
Question 9.
The materials which allow heat to pass through them easily are ………………
Answer
Answer: conductors
Question 10.
Plastic is a ……………… conductor of heat.
Answer
Answer: poor
Question 11.
The air from the land is called ……………… breeze.
Answer
Answer: land
Question 12.
……………… surface absorb more heat.
Answer
Answer: Black
Question 13.
All hot bodies radiate ………………
Answer
Answer: heat
Question 14.
The range of clinical thermometer is ………………
Answer
Answer: 35°C to 42°C
Question 15.
Heat transfer in liquid and gas occurs through a process called ………………
Answer
Answer: convection
III. True or False
Question 1.
We wear white clothes in summer to radiate heat from the body.
Answer
Answer: False
Question 2.
Sea breeze and land breeze occur due to convection currents set up in the air.
Answer
Answer: True
Question 3.
The heat from sun reaches us through convection.
Answer
Answer: False
Question 4.
Conduction is a process of heat transfer in which vibrating particles give energy to the neighbouring ones.
Answer
Answer: True
Question 5.
A reliable measure for the hotness of an object is called Kelvin.
Answer
Answer: False
Question 6.
The thermometer used to measure the temperature of our body is called a clinical thermometer.
Answer
Answer: True
Question 7.
A clinical thermometer reads temperature from 0°C to 30°C.
Answer
Answer: False
Question 8.
The average normal temperature of the human body is 98.6°F.
Answer
Answer: True
Question 9.
The maximum and minimum temperature of the days, reported in weather reports is measured by ‘maximum-minimum thermometer’.
Answer
Answer: True
Question 10.
The range of a laboratory thermometer is generally from -20°C to 100°C.
Answer
Answer: False
Question 11.
The ‘kink’ present in a clinical thermometer prevents the mercury level from falling on its own.
Answer
Answer: True
Question 12.
Mercury is a toxic substance.
Answer
Answer: True
Question 13.
Digital thermometers do not use mercury.
Answer
Answer: True
Question 14.
In every case, heat flows from a hot object to a hotter one.
Answer
Answer: False
Question 15.
Heat can cause expansion or combustion of an object.
Answer
Answer: True
IV. Match the Following
| Column I | Column II |
| 1. Sea breeze | (a) Night time |
| 2. Conductors | (b) Day time |
| 3. Insulators | (c) Requires no medium |
| 4. Thermometer | (d) Poor absorbers of heat |
| 5. Conduction | (e) Requires fluid medium |
| 6. Radiation | (f) Wood, plastic, wool, air, water |
| 7. Dark-coloured surfaces | (g) Requires solid medium |
| 8. Light-coloured surfaces | (h) Metals |
| 9. Land breeze | (i) Good absorbers of heat |
| 10. Convection | (j) A device to measure the degree of hotness |
Answer
Answer:
| Column I | Column II |
| 1. Sea breeze | (b) Day time |
| 2. Conductors | (h) Metals |
| 3. Insulators | (f) Wood, plastic, wool, air, water |
| 4. Thermometer | (j) A device to measure the degree of hotness |
| 5. Conduction | (g) Requires solid medium |
| 6. Radiation | (c) Requires no medium |
| 7. Dark-coloured surfaces | (i) Good absorbers of heat |
| 8. Light-coloured surfaces | (d) Poor absorbers of heat |
| 9. Land breeze | (a) Night time |
| 10. Convection | (e) Requires fluid medium |
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